a 0.750 g impure sample of khp is 38.3% khp how many milliliters of 0.117 m naoh would be required to completely neutralize the khp

Answers

Answer 1

We need 12.0 mL of 0.117 M NaOH to completely neutralize the impure sample of KHP.

The molar mass of KHP (potassium hydrogen phthalate) is 204.22 g/mol.

38.3% of 0.750 g is (0.383)(0.750 g) = 0.28725 g KHP.

We can calculate the number of moles of KHP using its molar mass:

0.28725 g / 204.22 g/mol = 0.001408 mol KHP

The balanced chemical equation for the reaction between KHP and NaOH is:

[tex]KHC_8H_4O_4 + NaOH → NaKC_8H_4O_4 + H_2O[/tex]

From the balanced equation, we can see that 1 mole of KHP reacts with 1 mole of NaOH. Therefore, we need 0.001408 mol of NaOH to react with the KHP.

We can calculate the volume of 0.117 M NaOH needed to provide 0.001408 mol NaOH:

0.001408 mol NaOH × (1 L / 1000 mL) × (1 / 0.117 mol/L) = 0.012 mL NaOH

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Related Questions

Br2(l)+2I−(aq)→2Br−(aq)+I2(s)

Express the energy change in kilojoules to two significant figures.

Answers

The energy change for the given reaction is -200 kJ.

The energy change for a reaction is given by the difference between the energy of the products and the energy of the reactants. In this case, the energy change can be calculated using the standard enthalpy of formation values of the reactants and products. The standard enthalpy of formation of Br2(l), 2I-(aq), Br-(aq) and I2(s) are 0 kJ/mol, -151 kJ/mol, -121 kJ/mol, and 62 kJ/mol, respectively. Using these values, we can calculate the energy change as:

ΔH = (2 x ΔHf°(Br-) + ΔHf°(I2) - 2 x ΔHf°(I-) - ΔHf°(Br2)) kJ/mol
   = (2 x (-121) + 62 - 2 x (-151) - 0) kJ/mol
   = -200 kJ/mol

Therefore, the energy change for the given reaction is -200 kJ, which means that the reaction is exothermic as it releases energy.

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in the synthesis of camphor, what compound would be a common impurity?

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In the synthesis of camphor, a common impurity that may be present is borneol.

Borneol is a stereoisomer of camphor, and the two compounds can interconvert under certain conditions. Borneol can be formed as an intermediate during the synthesis of camphor, and if not carefully controlled, it can contaminate the final product.

Borneol has a similar chemical structure to camphor, but it has different physical and chemical properties. Therefore, the presence of borneol as an impurity can affect the purity and properties of the synthesized camphor.

Stereoisomers are molecules with the same chemical formula and connectivity but differ in the spatial arrangement of their atoms, resulting in different properties.

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An 8.90-g sample of Fe3O4 reacts with O2 to produce Fe2O3:
4Fe3O4(s)+O2(g) → 6Fe2O3(s).
Determine the number of g of Fe2O3 produced, assuming that O2is in excess.

Answers

The number of mass of Fe₂O₃ is 9.1 g.

The mass of Fe₂O₄ is 8.90 g.

The balanced chemical reaction is given as,

4Fe₃O₄ + O₂ → 6Fe₂O₃

The molar mass of Fe₂O₄ is 233.55 g/mol.

Number of moles = 8.90/233.55 = 0.038 mol

4 moles of Fe₂O₄ gives 6 moles of Fe₂O₃.

So, the moles of Fe₂O₃ are ,

6/4 × 0.038 mol = 0.057 mol

The molar mass of Fe₂O₃ is 159.69 g/mol.

Substituting the values we get,

0.057 mol = Mass/159.69 g/mol

Mass = 0.057 mol × 159.69 g/mol = 9.1 g

Therefore, the mass of Fe₂O₃ is 9.1 g.

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Myoglobin has an affinity for membrane phospholipids. Which amino acid side chains are expected to interact favorably with phospholipids?

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Answer:What distribution of amino acids would you expect to find in a protein embedded in a lipid bilayer? Amino acids with polar side chains will be found on a soluble protein's surface, while amino acids with nonpolar side chains will be found inside the protein.

Explanation:

why is p-hydroxyacetophenone more polar than o-hydroxyacetophenone

Answers

The relative polarity of p-hydroxyacetophenone and o-hydroxyacetophenone can be explained by examining the positions of the hydroxyl (-OH) and carbonyl (C=O) functional groups on the aromatic ring.

In both molecules, the hydroxyl group is polar and can form hydrogen bonds with other polar molecules or functional groups.

However, in p-hydroxyacetophenone, the hydroxyl group is located at the para position, which means it is positioned opposite to the carbonyl group.

This results in a larger separation between the two functional groups, which reduces their ability to interact with each other through hydrogen bonding.

As a result, the molecule has a higher overall polarity as the dipole moment of each group is not canceled out by the other.

In contrast, in o-hydroxyacetophenone, the hydroxyl group is located at the ortho position, which means it is positioned adjacent to the carbonyl group.

This results in a closer proximity between the two functional groups, which enhances their ability to interact with each other through hydrogen bonding.

As a result, the molecule has a lower overall polarity as the dipole moment of each group is canceled out to some extent by the other.

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what is the concentration of hno3 if 7.40×10−2 mol are present in 885 ml of the solution?

Answers

The concentration of HNO₃ present in 885 ml of the solution is 0.0836M.

The concentration of HNO₃ can be calculated using the formula:

Concentration (M) = moles of solute (mol) / volume of solution (L)

Given:
Moles of HNO₃ = 7.40 × 10^(-2) mol
The volume of solution = 885 mL (convert to L by dividing by 1000)

Volume in L = 885 / 1000 = 0.885 L

Now, putting the values into the formula:

Concentration (M) = (7.40 × 10-² mol) / 0.885 L = 0.0836 M

The concentration of HNO₃  in the solution is 0.0836 M.

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Provide an expression in which the rate of production of N₂O₂ is set equal to the rate of consumption of N₂O₂.

Answers

The expression for the rate of production of N₂O₂ equal to the rate of consumption of N₂O₂ is: -Δ[N₂O₂]/Δt = k[N₂O₂].

In a chemical reaction, the rate of production and consumption of a species can be represented using the rate law. For the given question, we have the species N₂O₂. The rate of production or consumption of N₂O₂ can be written as the change in its concentration (-Δ[N₂O₂]) over the change in time (Δt).

The rate law is given by the expression: Rate = k[N₂O₂]^m, where k is the rate constant, [N₂O₂] is the concentration of N₂O₂, and m is the reaction order.

Since the rate of production equals the rate of consumption, the expression becomes -Δ[N₂O₂]/Δt = k[N₂O₂].

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what is the predicted product when cyclohexanone reacts with aqueous sodium hydroxide at 100°c?

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The predicted product when cyclohexanone reacts with aqueous sodium hydroxide at 100°c is 2-cyclohexen-1-one.

The reaction between cyclohexanone and aqueous sodium hydroxide at 100°C is a base-catalyzed aldol condensation reaction. The aldol condensation is a powerful tool for forming carbon-carbon bonds, and it is widely used in organic synthesis.

In this reaction, cyclohexanone acts as a nucleophile and attacks the carbonyl carbon of another cyclohexanone molecule that is activated by the sodium hydroxide base. The resulting intermediate, called an aldol, contains both an alcohol and an aldehyde/ketone functional group. This aldol intermediate is highly unstable and undergoes dehydration to form a double bond between the alpha and beta carbons.

The resulting product of this reaction is an α,β-unsaturated ketone, specifically 2-cyclohexen-1-one. This product is formed through the elimination of a molecule of water from the aldol intermediate. The reaction proceeds with the loss of a molecule of water, which leads to the formation of a double bond between the alpha and beta carbons.

The α,β-unsaturated ketone is an important intermediate in organic synthesis and can be used as a starting material for the synthesis of a wide range of organic compounds. The reaction is an example of how a simple carbonyl compound, cyclohexanone, can be used to form a complex molecule through the formation of carbon-carbon bonds using a base-catalyzed aldol condensation reaction.

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Glyceraldehyde-3-phosphate can do all of the following except
A. be converted to usable energy for the cell.
B. manufacture lipids.
C. produce trace elements required for plant growth (nitrogen, magnesium, phosphorus, etc.).
D. be converted to ribulose.

Answers

Glyceraldehyde-3-phosphate is a vital metabolic intermediate in both glycolysis and the Calvin cycle, which occur in all living organisms that undergo cellular respiration or photosynthesis.

It is formed from the breakdown of glucose during glycolysis and is then further processed to produce ATP, a key source of energy for cells. Additionally, glyceraldehyde-3-phosphate can be used to synthesize lipids for cellular membranes and other structures. However, glyceraldehyde-3-phosphate is not involved in the production of trace elements required for plant growth, such as nitrogen, magnesium, and phosphorus. These elements are typically obtained through the absorption of nutrients from the soil by plant roots. Furthermore, glyceraldehyde-3-phosphate cannot be directly converted into ribulose, a sugar that is an important component of the Calvin cycle.

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Experiment 2
100cm^3 of 1 mol dm^-3 hydrochloric acid added to 2g of small lumps of calcium carbonate at 20°C

The graph which is most likely to be produced from experiment 2 is Graph.....
because......​

Answers

According to solubility, the graph which is produced from experiment 2 is Graph 1 because the reaction of  HCl and calcium carbonate  forms product which is stable after a particular volume.

Solubility is defined as the ability of a substance which is  the ability of   a solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular  amount of solvent.

The solubility  depends on the composition of solute and solvent ,parameters of  pH and even  the presence of other dissolved substance which are present in the analyte.

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4. 7.00 g of gold was heated from 21.0°C to 232.0°C. How much heat was applied to the gold (c=0.129 J/gx C).

Answers

191.559 joules of heat energy were applied to the gold to raise its temperature from 21.0°C to 232.0°C.

To calculate the amount of heat applied to the gold, we can use the formula:

Q = m * c * ΔT

where:

Q is the heat applied to the gold (in joules),

m is the mass of the gold (in grams),

c is the specific heat capacity of gold (in J/g·°C), and

ΔT is the change in temperature (in °C).

Given:

m = 7.00 g (mass of gold)

c = 0.129 J/g·°C (specific heat capacity of gold)

ΔT = 232.0°C - 21.0°C = 211.0°C (change in temperature)

Plugging in the values into the formula, we get:

Q = 7.00 g * 0.129 J/g·°C * 211.0°C

Calculating this expression, we find:

Q = 191.559 J

Therefore, the amount of heat applied to the gold is 191.559 joules.

To elaborate on the calculation, we multiply the mass of the gold (7.00 g) by the specific heat capacity of gold (0.129 J/g·°C) to obtain the heat capacity of the gold. The heat capacity represents the amount of heat energy required to raise the temperature of a substance by one degree Celsius.Next, we multiply the heat capacity by the change in temperature (211.0°C) to find the total amount of heat energy applied to the gold. This is based on the assumption that the specific heat capacity remains constant over the temperature range.

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Write net ionic reaction for silver nitrate + ammonium sulfite

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The net ionic equation omits the spectator ions (NH4+ and NO3^-) that do not undergo any change during the reaction. Net ionic reaction: Ag+ (aq) + SO3^2- (aq) → Ag2SO3 (s)

In this reaction, silver nitrate (AgNO3) and ammonium sulfite (NH4)2SO3 react to form silver sulfite (Ag2SO3), which precipitates as a solid. When dissolved in water, silver nitrate dissociates into Ag+ ions, and ammonium sulfite dissociates into NH4+ ions and SO3^2- ions. The net ionic equation represents only the species that participate directly in the reaction. The Ag+ ions from silver nitrate combine with the SO3^2- ions from ammonium sulfite to form insoluble silver sulfite (Ag2SO3) as a precipitate. The net ionic equation omits the spectator ions (NH4+ and NO3^-) that do not undergo any change during the reaction.

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how the sequence and subcomponents of the four groups of organic compounds determine their properties.

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The four main groups of organic compounds are hydrocarbons, alcohols, carboxylic acids, and amines. The sequence and subcomponents of these groups play a significant role in determining their properties.

Hydrocarbons: Hydrocarbons are organic compounds composed of carbon and hydrogen atoms. Their properties depend on factors such as the type of bonding (single, double, or triple bonds), the arrangement of carbon atoms (linear or cyclic), and the presence of functional groups. These factors influence properties like boiling point, melting point, solubility, reactivity, and stability.

Alcohols: Alcohols are organic compounds that contain the hydroxyl (-OH) functional group. The properties of alcohols are influenced by the size and nature of the alkyl group attached to the hydroxyl group. The length of the carbon chain, branching, and presence of double or triple bonds affect properties such as boiling point, solubility, acidity/basicity, and reactivity.

Carboxylic acids: Carboxylic acids have the carboxyl (-COOH) functional group. The properties of carboxylic acids depend on the size and nature of the alkyl group attached to the carboxyl group, as well as the presence of other functional groups. Factors like chain length, branching, and the presence of electron-withdrawing or electron-donating groups influence properties such as acidity, solubility, boiling point, and reactivity.

Amines: Amines are organic compounds containing the amino (-NH2) functional group. The properties of amines depend on the size and nature of the alkyl or aryl groups attached to the amino group, as well as the presence of other functional groups. Factors like the degree of substitution, steric hindrance, and the presence of electron-withdrawing or electron-donating groups influence properties such as basicity, solubility, boiling point, and reactivity.

In summary, the sequence and subcomponents of organic compounds determine their properties by influencing factors such as molecular size, shape, functional groups, bonding, and electron distribution. These factors affect properties such as boiling point, melting point, solubility, acidity/basicity, and reactivity, making each group of organic compounds unique in their characteristics.

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what is the lumo of the li₂ molecule? a) 1σ b) 1σ* c) 2σ d) 2σ* e) 1π

Answers

The LUMO (lowest unoccupied molecular orbital) of the Li₂ molecule is the 2σ* orbital.

Li₂ is a homonuclear diatomic molecule, meaning it consists of two identical atoms of lithium. In molecular orbital theory, the two atomic orbitals of each lithium atom combine to form a set of bonding and antibonding molecular orbitals. The lowest energy molecular orbital is the bonding 1σ orbital, followed by the antibonding 1σ* orbital. The next set of molecular orbitals are the bonding and antibonding 2σ and 2σ* orbitals. The LUMO of Li₂ is the highest energy antibonding orbital, which is the 2σ* orbital.

Therefore, the LUMO of the Li₂ molecule is the 2σ* orbital, which is option d) in the given choices.

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what is the coordination number of the transition metal ion in [zn(en)2]br2?

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The coordination number of the transition metal ion (zinc) in [Zn(en)2]Br2 is 4.

In the coordination complex [Zn(en)2]Br2, the transition metal ion is zinc (Zn).

To determine the coordination number of the transition metal ion, we count the number of ligands directly bonded to the central metal ion. In this case, the ligand is ethylenediamine (en), which is represented as (en) in the formula.

Each ethylenediamine (en) ligand contributes two nitrogen atoms that can form coordination bonds with the central metal ion. Therefore, in the complex [Zn(en)2]Br2, there are a total of four nitrogen atoms from the two ethylenediamine ligands.

Since each coordination bond involves one ligand, the coordination number is equal to the number of ligands directly bonded to the metal ion. In this case, there are four nitrogen ligands bonded to the zinc ion.

Therefore, the coordination number of the transition metal ion (zinc) in [Zn(en)2]Br2 is 4.

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Why is it important that we, as humans, have each type of biomolecule in our bodies?

A. They are used in creating and storing our genetic information

B. They are used to make and structure cells.

C. They are used to build muscles and assist in chemical reactions.

D. They are used as energy in various bodily processes.

E.all above

Answers

it’s B. They are used to make and structure cells.

(a) How many normal modes of vibration do the following molecules have?
NH3, HCN, H2S, C2H2, CH3OH
(b) Sketch normal modes for HCN and H2S.

Answers

NH₃ has 6 normal modes of vibration and HCN has 3 normal modes of vibration.

(a) To determine the number of normal modes of vibration for each molecule, we can use the formula:

3N - 6

where N is the number of atoms in the molecule. This formula assumes that the molecule is non-linear. If the molecule is linear, we use the formula:

3N - 5

NH₃:

N = 4

3N - 6 = 12 - 6 = 6

NH₃ has 6 normal modes of vibration.

HCN:

N = 3

3N - 6 = 9 - 6 = 3

HCN has 3 normal modes of vibration.

H₂S:

N = 3

3N - 6 = 9 - 6 = 3

H₂S has 3 normal modes of vibration.

C₂H₂:

N = 4

3N - 6 = 12 - 6 = 6

C₂H2 has 6 normal modes of vibration.

CH₃OH:

N = 6

3N - 6 = 18 - 6 = 12

CH₃OH has 12 normal modes of vibration.

(b) Here are the normal modes of vibration for HCN and H₂S:

HCN:

Mode 1: Stretching vibration of C≡N bond

Mode 2: Bending vibration of H-C≡N group

Mode 3: Stretching vibration of H-C≡N group

H₂S:

Mode 1: Symmetric stretching vibration of S-H bonds

Mode 2: Bending vibration of H-S-H group

Mode 3: Asymmetric stretching vibration of S-H bonds

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a buffer is created by combining 4.14 g of ammonia with 5.11 g of hydrochloric acid and diluting to a total volume of 650.0 ml. determine the ph of the buffer.

Answers

The solution formed by combining hydrochloric acid and ammonia is .Explanation:Moles of hydrochloric acid is calculated as,Moles of ammonia is calculated as,The reaction between ammonia and hydrochloric acid is as follows,The number of moles of hydrochlroic acid is less or it act as a limiting reagent. All the moles of the hydrochloric acid will be exhautes and in the solution only moles of ammonia and ammonium ion will be left.The ICE table is as follows,The resulting components in the solution forms a buffer solution.From the ICE table,The concentration of ammonia is calculated as,The concentration of ammonium ion is calculated as,The value of for ammonia is.value is calculated as,The Henderson-Hasselbalch equation is given as,Substitute the value.

Show how you would synthesize each compound from benzene, toluene, or phenol using the following reactions Reactions 1. Halogenation 2. Nitration 3. Sulfonation 4. Friedel-Crafts acylation 5. Friedel-Crafts alkylation 6. Oxidation of methyl group 7. Reduction of nitro group

Answers

Halogenation, Nitration, Sulfonation, Friedel-Crafts acylation, Friedel-Crafts alkylation, Oxidation of methyl group, Reduction of nitro group are  distinct chemical reactions involving organic compounds.

Using Halogenation, Nitration, Sulfonation, Friedel-Crafts acylation and alkylation, Oxidation of methyl group and Reduction of nitro group, benzene, toluene, or phenol can be synthesized in the following ways:

1. Halogenation: Benzene, toluene, or phenol can be halogenated by reacting them with a halogen (e.g., chlorine or bromine) in the presence of a Lewis acid catalyst.

For example, benzene can be chlorinated to form chlorobenzene using FeCl3 as a catalyst.

2. Nitration: Nitration of benzene, toluene, or phenol involves the substitution of a nitro group (-NO2) onto the aromatic ring.

This reaction is typically carried out by treating the compound with a mixture of concentrated nitric acid and sulfuric acid. For instance, benzene can be nitrated to produce nitrobenzene.

3. Sulfonation: Sulfonation introduces a sulfonic acid group (-SO3H) onto the aromatic ring. It can be achieved by reacting benzene, toluene, or phenol with concentrated sulfuric acid.

For example, benzene can be sulfonated to form benzenesulfonic acid.

4. Friedel-Crafts acylation: Friedel-Crafts acylation involves the reaction of benzene or toluene with an acyl chloride in the presence of a Lewis acid catalyst, such as aluminum chloride (AlCl3).

This reaction results in the formation of an aromatic ketone. For instance, benzene can be acylated to produce acetophenone.

5. Friedel-Crafts alkylation: Friedel-Crafts alkylation allows the introduction of an alkyl group onto the aromatic ring.

It can be achieved by reacting benzene or toluene with an alkyl halide in the presence of a Lewis acid catalyst. For example, benzene can be alkylated to form ethylbenzene.

6. Oxidation of methyl group: Toluene contains a methyl group attached to the aromatic ring, which can be oxidized to a carboxylic acid.

This can be accomplished by treating toluene with a strong oxidizing agent, such as potassium permanganate (KMnO4) or chromic acid (H2CrO4).

The oxidation of the methyl group in toluene results in the formation of benzoic acid.

7. Reduction of nitro group: Nitro groups (-NO2) can be reduced to amino groups (-NH2) by various reducing agents, such as hydrogen gas in the presence of a metal catalyst (e.g., palladium, Pt).

For example, nitrobenzene can be reduced to aniline (phenylamine) by catalytic hydrogenation.

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if a liter of water is heated from 20°c to 50°c what happens to its volume

Answers

If a liter of water is heated from 20°C to 50°C, its volume will increase. The exact amount of expansion depends on the coefficient of thermal expansion of the substance, which for water is about 0.00021 per degree Celsius.

This is because water, like most substances, expands when heated and contracts when cooled.

Therefore, to calculate the change in volume, we need to know the starting volume of the liter of water and the coefficient of thermal expansion of water.

Assuming that the starting volume is exactly 1 liter, and using the coefficient of thermal expansion for water of 0.00021, we can calculate the change in volume as:

Change in volume = 1 liter x 0.00021 x (50°C - 20°C) = 0.0063 liters

So the final volume of the water would be approximately 1.0063 liters.

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draw both enolates formed when the ketone is treated with base. include charges. draw the oxyanion species; do not draw carbanion resonance forms. the starting material is a 6 carbon ring where carbon 1 is double bonded to oxygen and carbon 2 has a methyl substituent. this forms enolate 1 and enolate 2.

Answers

When a ketone is treated with a base, it can form two different enolates due to tautomerism. Enolate 1 is formed when the hydrogen from the α-carbon is removed, forming a double bond between the α-carbon and the oxygen. Enolate 2 is formed when the hydrogen from the methyl group is removed, forming a double bond between the methyl group and the α-carbon.

The starting material is a 6 carbon ring with a ketone functional group on carbon 1 and a methyl group on carbon 2. When a strong base is added, such as sodium hydroxide (NaOH), it can deprotonate the α-carbon or the methyl group. When the α-carbon is deprotonated, it forms enolate 1 with a negative charge on the oxygen and a double bond between the α-carbon and the oxygen. When the methyl group is deprotonated, it forms enolate 2 with a negative charge on the α-carbon and a double bond between the α-carbon and the methyl group.

In summary, when a ketone is treated with a base, it can form two different enolates, enolate 1 and enolate 2. Enolate 1 is formed when the α-carbon is deprotonated, and enolate 2 is formed when the methyl group is deprotonated. These enolates have different structures due to tautomerism and can be used in different reactions in organic chemistry.

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Viewing the molecules in MarvinView reveals that changes in stereochemistry impact the three-dimensional structure. Which two monosaccharides differ most in three-dimensional structure?A. D-glucose and D-galactoseB. D-mannose and D-galactoseC. D-glucose and D-mannoseD. The differences are equivalent for all three pairs.

Answers

The correct answer is B. D-mannose and D-galactose.

To know how the correct answer was determined, we must get to know the terms involved:


1. Stereochemistry: The study of the three-dimensional arrangement of atoms in molecules.
2. Monosaccharides: The simplest form of carbohydrates, also known as simple sugars.
3. MarvinView: A software tool used to visualize and analyze chemical structures.

Now, let's compare the pairs of monosaccharides given:

A. D-glucose and D-galactose differ in the stereochemistry at the C-4 carbon.
B. D-mannose and D-galactose differ in the stereochemistry at the C-2 and C-4 carbons.
C. D-glucose and D-mannose differ in the stereochemistry at the C-2 carbon.

Based on the differences in stereochemistry, the two monosaccharides that differ most in three-dimensional structure are:

B. D-mannose and D-galactose, as they have differences at two carbon positions (C-2 and C-4), leading to the most significant change in their three-dimensional structures.

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an atom or group of atoms with an unpaired electron in the outermost shell is called a(n)

Answers

An atom or group of atoms with an unpaired electron in the outermost shell is called a free radical.

Free radicals are highly reactive chemical species due to their unpaired electron, which makes them unstable and likely to react with other molecules in the body to gain or lose electrons, causing damage to cell membranes, DNA, and other cellular structures.

They are formed naturally during metabolic processes in the body and can also be generated by exposure to environmental factors such as UV radiation, air pollution, and cigarette smoke.

To neutralize free radicals, the body produces antioxidants, which are molecules that can donate an electron to the free radical without becoming unstable themselves.

Consuming a diet rich in antioxidants from fruits, vegetables, and other sources is thought to help protect against the damaging effects of free radicals and reduce the risk of chronic diseases such as cancer and heart disease.

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A student has a solution of unknown concentration of the strong acid HCl. Which of the following would be necessary in order to perform a titration to determine the concentration of the solution?
A distillation apparatus
An acid solution of known concentration
A base solution of known concentration
An acid-base indicator
A calibrated buret

Answers

A calibrated buret. In order to perform a titration to determine the concentration of the unknown solution of the strong acid HCl, the following items would be necessary: an acid solution of known concentration, a base solution of known concentration, an acid-base indicator, and a calibrated buret.

The acid solution of known concentration is used as the titrant, while the base solution of known concentration is added to the unknown solution until the equivalence point is reached. The acid-base indicator is used to signal when the equivalence point has been reached, and the calibrated buret is used to measure the volume of the titrant that has been added. This information is then used to calculate the concentration of the unknown strong acid solution.
To perform a titration to determine the concentration of the HCl solution (a strong acid), you would need:

1. A base solution of known concentration: This is required to neutralize the HCl and determine the volume needed to reach the equivalence point.
2. An acid-base indicator: This helps to visually identify when the solution has reached the equivalence point, which is when the indicator changes color.
3. A calibrated buret: This accurately measures and delivers the base solution, allowing you to determine the amount used to neutralize the acid.

So, the necessary components are a base solution of known concentration, an acid-base indicator, and a calibrated buret.

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why should absorbance be less than 2? please explain in terms of light transmittance.

Answers

Absorbance should be less than 2 due to its relationship with light transmittance, which can be better understood through the Beer-Lambert Law.

The Beer-Lambert Law states that absorbance (A) is directly proportional to the concentration (c) of the sample and the path length (l) of the light passing through the sample. Mathematically, it can be represented as:

A = ε × c × l

Where ε is the molar absorptivity.

Now, let's discuss light transmittance (T), which is the percentage of light that passes through the sample and is not absorbed. Absorbance and transmittance are related by the following equation:

A = -log10(T)

When absorbance is less than 2, it means that the transmittance is at a reasonable level, allowing for accurate measurements. If absorbance is greater than 2, transmittance becomes very low (less than 1%), leading to potential inaccuracies in the measurement due to limitations in the sensitivity of the instrument or possible interferences.

In summary, keeping absorbance less than 2 ensures that the light transmittance is at a level that allows for accurate and reliable measurements in spectrophotometry experiments.

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Which metal(s) is most likely to accommodate Hatoms (radius 37.0 pm) with the least distortion to the crystalline lattice, given their atomic radii? Choose one or more: titanium (atomic radii - 147 pm) zirconium (atomic radii - 160 pm) hafnium (atomic radii - 159 pm)

Answers

The metal most likely to accommodate H atoms (radius 37.0 pm) with the least distortion to the crystalline lattice is Zirconium (atomic radii - 160 pm).

When comparing the atomic radii of the given metals (Titanium - 147 pm, Zirconium - 160 pm, Hafnium - 159 pm) with the H atom radius (37.0 pm), we should choose the metal with the largest atomic radius. A larger atomic radius indicates more space within the lattice to accommodate H atoms, thus causing less distortion.

Among the given metals, Zirconium has the largest atomic radius, making it the most suitable metal to accommodate H atoms with minimal distortion to the crystalline lattice.

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how many grams of glucose are present in 500.0 ml of a 5.00% (m/v) solution?

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There are 25 grams of glucose present in 500.0 mL of a 5.00% (m/v) solution.

To calculate the grams of glucose present in the solution, we need to use the mass/volume percent concentration formula. Mass/volume percent is calculated by dividing the mass of the solute (glucose) by the volume of the solution and multiplying by 100.

Given:

Volume of solution (V) = 500.0 mL

Mass/volume percent concentration (m/v) = 5.00%

To find the mass of glucose, we can set up a proportion using the given concentration:

5.00 g/100 mL = x g/500.0 mL

To solve for x, we can cross-multiply and then divide:

(5.00 g)(500.0 mL) = (100 mL)(x g)

2500 g·mL = 100x g·mL

Dividing both sides by 100 mL gives us:

25 g = x

Therefore, there are 25 grams of glucose present in 500.0 mL of the 5.00% (m/v) solution.

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if 975 g of solution contains 0.077 kg of solute, what is the percent by mass concentration?

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The percent by mass concentration of the solution is 7.9%. The percent by mass concentration is a measure of the amount of solute in a solution, expressed as a percentage of the total mass of the solution.

To calculate it, we first need to convert the mass of the solute from kilograms to grams: 0.077 kg = 77 g. Then, we can divide the mass of the solute by the total mass of the solution and multiply by 100 to get the percent by mass concentration: (77 g / 975 g) x 100 = 7.9%. Therefore, the percent by mass concentration of the solution is 7.9%.
find the percent by mass concentration of the given solution. Here are the steps to solve this problem:

1. Convert the mass of solute to grams: 0.077 kg * 1000 g/kg = 77 g
2. Calculate the mass of the solvent: 975 g (solution) - 77 g (solute) = 898 g (solvent)
3. Determine the total mass of the solution: 77 g (solute) + 898 g (solvent) = 975 g
4. Calculate the percent by mass concentration: (mass of solute / mass of solution) * 100%
5. Substitute the values: (77 g / 975 g) * 100% = 7.9%

The percent by mass concentration of the solution is 7.9%.

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6. a solution of phosphoric acid, h3po4, is found to contain 35.2 g of h3po4 per liter of solution. calculate the molarity and normality of the solution.

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The molarity of the H3PO4 solution is 0.361 M, and the normality of the solution is 1.084 N.

First, we need to determine the molar mass of H3PO4:
1 P = 30.97 g/mol
3 H = 3 x 1.01 g/mol = 3.03 g/mol
4 O = 4 x 16.00 g/mol = 64.00 g/mol
Total molar mass = 30.97 + 3.03 + 64.00 = 98.00 g/mol
Next, we'll calculate the molarity of the solution:
Molarity (M) = (mass of solute in grams) / (molar mass x volume of solution in liters)
M = (35.2 g) / (98.00 g/mol x 1 L) = 0.361 M
To find the normality, we need to consider the number of hydrogen ions that can be replaced in the reaction (i.e., the number of acidic protons). H3PO4 has 3 acidic protons, so we multiply the molarity by 3 to obtain the normality:
Normality (N) = Molarity x number of acidic protons
N = 0.361 M x 3 = 1.084 N

Thus, the molarity of the H3PO4 solution is 0.361 M, and its normality is 1.084 N.

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For each of Newton’s three laws of motion, compare kicking a 650-g bowling ball to kicking a 56-g tennis ball with the same amount of force.

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According, Newton three laws of motion when kicking the bowling ball, the force that is applied will be transferred back to the person's foot, causing a reaction. The same would happen when kicking the tennis ball but to a lesser extent.

Sir Isaac Newton's three laws of motion is used to explain how objects interact with one another, and they are relevant in both our daily lives and modern technology.

These laws can be compared by kicking a 650-g bowling ball to kicking a 56-g tennis ball with the same amount of force, which is explained below:First Law: Inertia Inertia is the resistance of an object to a change in motion.

The first law of motion says that an object will remain at rest or in constant motion in a straight line unless acted upon by an unbalanced force.

When kicking a 650-g bowling ball with the same amount of force as a 56-g tennis ball, the bowling ball will not move as far as the tennis ball since the mass of the bowling ball is greater and requires more force to move.

Second Law: Force and Acceleration The second law of motion says that the force acting on an object is equal to the object's mass times its acceleration.

Therefore, a greater force is required to move the bowling ball, as it has a greater mass, compared to the tennis ball, which has a smaller mass.

This means that the bowling ball would require a higher force than the tennis ball to achieve the same acceleration.

Third Law: Action and Reaction The third law of motion says that for every action, there is an equal and opposite reaction.

When a force is exerted, the object will exert an equal and opposite force back.

Therefore, when kicking the bowling ball, the force that is applied will be transferred back to the person's foot, causing a reaction.

The same would happen when kicking the tennis ball but to a lesser extent.

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