The two reactions involved in a redox reaction are oxidation and reduction.
The oxidation reaction is the reaction in the loss of the elctrons take place or the oxidation is the increase of the oxidation number. The reduction reaction is the reaction where the gain of the electrons takes place or the reduction is the decrease in the oxidation number.
The redox reaction can be described as the chemical reaction in which the electrons are transferred in between the two reactants participating in it. The redox reaction is the in which the oxidation and the reduction both will occurs at the same time.
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for the activated carriers widely used in metabolism nadh, nadph, fadh2. what is the the group with high-energy linkage?a. hydrogen and electronsb. phosphatec. carboxyl groupd. methyl groupe. glucosef. acetyl group
The group with a high-energy linkage in the activated carriers NADH, NADPH, and FADH₂ is hydrogen and electrons. Option A is correct.
These molecules are involved in redox reactions, which transfer electrons from a donor molecule (such as glucose) to an acceptor molecule (such as oxygen), releasing energy that can be used to generate ATP. NADH, NADPH, and FADH₂ all carry high-energy electrons that can be used to power ATP synthesis through oxidative phosphorylation.
The other groups listed (phosphate, carboxyl, methyl, glucose, and acetyl) are important in metabolism but do not have high-energy linkages like hydrogen and electrons.
Hence, A. Hydrogen and electrons is the correct option.
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Select The True Statements About Protein Secondary Structure. TheChoose the correct statement about secondary protein structure. a. The second level of protein structure refers to the spatial arrangement of short protein segments. b. Peptide bonds stabilize the secondary structure c. In pleated ẞ-sheets, the side chains extend above and below the sheet. d. In an a-helix, the side chains are located inside the helix. e. B- pleated sheets are held together by hydrogen bonds between adjacent segments.
The true statements about protein secondary structure are: Peptide bonds stabilize the secondary structure, In pleated β-sheets, the side chains extend above and below the sheet. β-pleated sheets are held together by hydrogen bonds between adjacent segments. Option B, C, and E is correct.
Protein secondary structure refers to the regular patterns of folding of the polypeptide chain that are formed by hydrogen bonding between the backbone atoms (N-H and C=O) of the amino acid residues.
Peptide bonds between amino acid residues contribute to the stability of the secondary structure.
In β-pleated sheets, the polypeptide chains are extended and form a sheet-like structure. The side chains of the amino acid residues extend above and below the sheet.
β-pleated sheets are held together by hydrogen bonds between adjacent segments of the polypeptide chain.
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--The given question is incorrect, the correct question is
"Select The True Statements About Protein Secondary Structure. a. The second level of protein structure refers to the spatial arrangement of short protein segments. b. Peptide bonds stabilize the secondary structure c. In pleated ẞ-sheets, the side chains extend above and below the sheet. d. In an a-helix, the side chains are located inside the helix. e. B- pleated sheets are held together by hydrogen bonds between adjacent segments."--
I’m kind of confused.
The experimental rate law is; Rate = k[O2] [NO]^2
Thus the reaction is first order with respect to oxygen and second order with respect to nitrogen monoxide
What is the rate constant?The rate constant, represented by the symbol k, is a proportionality constant that relates the rate of a chemical reaction to the concentration of reactants. The rate constant is specific to a particular reaction and is determined experimentally.
The rate law of a chemical reaction expresses the relationship between the rate of the reaction and the concentrations of the reactants.
We know that;
2.56 * 10^-1/8.52 * 10^-2 = (0.09/0.03)^n
3 = 3^n
n = 1
Again;
7.67 * 10^-1/8.52 * 10^-2 = 0.06/0.02
9 = 3^n
3^2 = 3^n
n = 2
The rate law is;
Rate = k[O2] [NO]^2
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What is a chemical formula symbol?
Answer:
NaCIO (chemical formula for bleach)
Suppose you were making up a solution of sodium nitrate at 25°C and that you added
1.1 kg of sodium nitrate to 1 L of water. What would this mixture be like after you had
stirred it for several minutes?
Explanation:
Preparing a saturated solution of sodium chloride at 25 ° C : Bring the water to 25 ° C and add keep on adding sodium chloride to it and stir it until no more sodium chloride can dissolve in it. On cooling the water to 10 ° C , some of the sodium chlorides will be separated from the water by crystallization.
calculate the molarity of a 10.0% CaCl2 solution. the density of the solution is 1.0835 g/cm³.
The molarity of the 10.0% CaCl2 solution is 0.9007 M
What is the molarity of the solution?To calculate the molarity of the CaCl2 solution, we need to first determine the mass of CaCl2 present in one liter (1000 mL) of the solution.
A 10.0% CaCl2 solution means that 10.0 g of CaCl2 is present in 100 g of the solution. We can use this information to calculate the mass of CaCl2 in one liter of the solution as follows:
Mass of CaCl2 in 1 L = (10.0 g CaCl2 / 100 g solution) x (1000 g solution / 1 L solution)
Mass of CaCl2 in 1 L = 100 g CaCl2 / 1 L solution
Now that we know the mass of CaCl2 in one liter of the solution, we can use the molarity formula to calculate the molarity of the solution:
Molarity = moles of solute / volume of solution (in liters)
To find the moles of CaCl2 present in one liter of the solution, we need to divide the mass of CaCl2 by its molar mass. The molar mass of CaCl2 is 110.98 g/mol
moles of CaCl2 in 1 L = 100 g CaCl2 / 110.98 g/mol = 0.9007 mol
Finally, we can use the formula for molarity to calculate the molarity of the solution:
Molarity = moles of solute / volume of solution
Molarity = 0.9007 mol / 1 L = 0.9007 M
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Draw the lewis structure.
Label the molecule with - and + if applicable.
Draw the molecule 2 more times so that the molecules are correctly oriented based on the partial charges (if applicable). You should have 3 total molecules.
With a dashed line (----) show how this molecule would interact. (connect partial positive to partial negative)
Identify the type/s of intramolecular forces.
For SI2 & NH3
The Lewis structures of SI₂ and NH₃ are attached in the images as attachments.
What are Lewis structures?Lewis structures are also called as electron dot structures and can be drawn if the molecular formula of a compound is known. It provides information regarding the nature of bond and the position of atoms .
They are also capable of exhibiting the lone pair if any present in a molecule or compound.Lewis defined a base to be an electron pair donor and an acid to be an electron pair acceptor.
They are capable of reflecting electronic structure of elements and even the pairing of electrons . In the diagram, each dot represents an electron while a pair of dots represent a bond between the atoms.
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Which of the following reaction is not oxidation-reduction reaction? CH4 + 2O2 → CO2 + 2H2OFe2O3 + 3C → 2Fe + 3CO3CuO + 2NH3 → 3Cu + N2 + 3H2OCa(OH)2 + 2CH3COOH → Ca(CH3COO)2 + 2H2O
The reaction that is not an oxidation-reduction reaction is Ca(OH)₂ + 2CH₃COOH → Ca(CH₃COO)₂ + 2H₂O.
The reaction that is not an oxidation-reduction reaction is the last option, Ca(OH)₂ + 2CH₃COOH → Ca(CH₃COO)₂ + 2H₂O. Oxidation-reduction (redox) reactions involve the transfer of electrons between reactants. In the first reaction, CH₄ is oxidized to CO₂ and O₂ is reduced to H₂O. In the second reaction, Fe2O₃ is reduced to Fe and C is oxidized to CO. In the third reaction, CuO is reduced to Cu and NH₃ is oxidized to N₂ and H₂O. However, in the last reaction, there is no transfer of electrons between the reactants. Instead, the reaction involves the exchange of ions between Ca(OH)₂ and CH₃COOH to form Ca(CH₃COO)₂ and H₂O.
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why are atoms likely to share electrons?
The atoms of some elements share electrons because this provides them with a full valence shell. All atoms strive to attain a full valence shell, just like noble gases. This is the most stable electron arrangement.
If atoms can't attain a full outer shell by transferring electrons, they resort to sharing. In this mode, each atom can estimate the shared electrons as facets of its own valence shell. This sharing of electrons is covalent bonding. Atoms will covalently bond with other atoms in a mandate to gain more stability, which is attained by forming a full electron shell. By sharing their outermost (valence) electrons, atoms can suffice up their outer electron shell and gain stability.
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A compound has the molecular formula C5H10O, and strong absorptions at 1100 and 3350 cm−1. Which is the most likely structure for the compound?A). Cyclopentanol. B). C-H. C). Hydrogen bonding. D. 2500-3300 cm-1.
Answer:
Explanation:
The strong absorption at 3350 cm−1 indicates the presence of an O-H group, while the absorption at 1100 cm−1 indicates the presence of a C-O bond. Based on this information and the molecular formula C5H10O, the most likely structure for the compound is cyclopentanol, which has the molecular formula C5H10O and contains both a C-O bond and an O-H group.
Therefore, the correct answer is (A) Cyclopentanol.
The answer choices (B) C-H and (C) Hydrogen bonding are not directly related to the given information about the absorption spectra and the molecular formula of the compound. The answer choice (D) 2500-3300 cm-1 is a range of absorption frequencies for N-H and O-H stretching vibrations, but the given information only refers to the absorption at 3350 cm−1, which is within this range and indicates the presence of an O-H group in the compound.
The compound with molecular formula C5H10O and strong absorption at 1100 and 3350 cm−1 is most likely Cyclopentanol, indicated by the presence of a hydroxyl group and C-O stretching.
Explanation:The molecular formula C5H10O represents a compound with 5 Carbon atoms, 10 Hydrogen atoms, and 1 Oxygen atom. Given the absorption bands at 1100 and 3350 cm−1 within the infrared spectrum, the compound is most likely to be Cyclopentanol. The strong absorption at around 3350 cm-1 suggests the presence of an hydroxyl (—OH) group, characteristic for alcohols. The 1100 cm−1 peak can be attributed to C-O stretching. The structure of Cyclopentanol includes a five-member ring of carbons with the OH group attached to one of the carbons.
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Hydrogen is produced by the action of sulfuric acid on zine metal and collected over water in a 255 mL container at 24.0 °C and 855 torr. The vapor pressure of water at 24.0 °C is 22.38 torr. What is the pressure of the dry hydrogen alone?
The pressure of the dry hydrogen alone is 231.7 torr.
How would the pressure of the dry hydrogen change if the container temperature was raised to 40.0 °C?The pressure of the dry hydrogen would increase because as the temperature increases, the vapor pressure of water also increases, which in turn increases the total pressure in the container.
We need to use the Dalton's law of partial pressures, which states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the individual gases.
The pressure of the dry hydrogen alone is equal to the total pressure of the hydrogen and water vapor mixture minus the vapor pressure of water at the given temperature.
First, let's calculate the partial pressure of hydrogen:
Partial pressure of hydrogen = Total pressure - Vapor pressure of water
Partial pressure of hydrogen = 855 torr - 22.38 torr
Partial pressure of hydrogen = 832.62 torr
Next, let's convert the volume of the container from milliliters to liters, and convert the temperature from Celsius to Kelvin:
Volume = 255 mL = 0.255 L
Temperature = 24.0 °C + 273.15 = 297.15 K
Finally, we can calculate the pressure of the dry hydrogen alone using the ideal gas law:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.
Assuming the hydrogen behaves as an ideal gas, we can rearrange the ideal gas law to solve for the number of moles:
n = PV/RT
where P, V, and T are the partial pressure, volume, and temperature of the dry hydrogen.
Rearranging this equation again, we can solve for the pressure of the dry hydrogen alone:
P = nRT/V
P = (PV/RT)RT/V
P = (Partial pressure of hydrogen)(Volume of container)/(Number of moles of hydrogen)(Gas constant)(Temperature)
P = (832.62 torr)(0.255 L)/[(Number of moles of hydrogen)(0.0821 Latm/(molK))(297.15 K)]
Solving for the number of moles of hydrogen:
n = PV/RT
n = (832.62 torr)(0.255 L)/(0.0821 Latm/(molK))(297.15 K)
n = 0.0112 moles
Substituting the number of moles into the equation for pressure:
P = (832.62 torr)(0.255 L)/(0.0112 moles)(0.0821 Latm/(molK))(297.15 K)
P = 231.7 torr
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do all molecular structures have at least one imaginary frequency
All molecular structures have at least one imaginary frequency.
A molecule's vibrational frequencies are quantized, or can only take on specific discrete values, according to quantum physics. A molecule is said to be stiff if it contains fewer than three atoms because there are no degrees of freedom for vibration.
A molecule has degrees of freedom for vibration when it has three or more atoms, and it can absorb or emit energy in the form of photons that match these vibrational frequencies.
For becoming real, a molecule needs all its vibrational frequencies. or to match the molecule's true vibrational motions, in order to have a stable geometry.
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What is the activation energy for the isomerization of methyl isocyanide? Rate Constant Temperature 4.30 X 10-3 min-1 472 K5.54 x 10-2 min-1 503 K
The concept Arrhenius equation is used here to determine the activation energy for the isomerization of methyl isocyanide. The activation energy is 1.892 kJ / mol.
What is Arrhenius equation?According to Arrhenius equation, lower the activation energy of a reaction, the higher is the rate of the reaction. The equation can be represented as:
[tex]k = A. e^{-} ^{E_{a} } / RT[/tex]
For two different temperature and rate constants, the equation is:
log K₂/K₁ = Eₐ / 2.303 R [ T₂ - T₁ / T₁T₂]
log 5.54 × 10⁻² / 4.30 × 10⁻³ = Eₐ / 2.303 × 8.314 [ 503 - 472 / 503 × 472]
Eₐ = 1.892 kJ / mol
Thus the activation energy for the isomerization of methyl isocyanide is 1.892 kJ / mol.
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how many oxygen atoms are there in 52.06 g of carbon dioxide?
There are approximately [tex]1.424 x 10^24[/tex] oxygen atoms in 52.06 g of carbon dioxide.
To calculate the number of oxygen atoms in 52.06 g of carbon dioxide, we want to initially decide the number of moles of carbon dioxide present, and afterward utilize the mole proportion between carbon dioxide and oxygen to compute the number of oxygen iotas.
The molar mass of carbon dioxide (CO2) is 44.01 g/mol, and that implies that 1 mole of CO2 contains 2 moles of oxygen iotas (since the nuclear proportion of O to C in CO2 is 2:1).
Thus, to calculate the quantity of moles of CO2 in 52.06 g, we partition the mass by the molar mass:
n = m/M = 52.06 g / 44.01 g/mol = 1.182 mol
Now, we can use the mole ratio between CO2 and O to find the number of oxygen atoms:
1.182 mol CO2 x 2 mol O / 1 mol [tex]CO2 x 6.022 x 10^{23}[/tex] atoms/mol = [tex]1.424 x 10^{24}[/tex]oxygen atoms
Therefore, there are approximately [tex]1.424 x 10^{24}[/tex] oxygen atoms in 52.06 g of carbon dioxide.
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if you wanted to find iron and sulfur on the moon, where would you look:
a) inside the moon's craters b) in the maria, or seas c) inside the moon's core
You should look within the moon's core if we were interested in discovering iron & sulfur there.
What really is sulfur used it for?Sulfuric acid, which would be utilized in numerous industries, is frequently made from sulfur. Particularly, lead-acid batteries and fertilizers are made with sulfuric acid. Inorganic compounds, explosives, cement, & glass are all made with sulfur as well.
Why is sulfur poisonous?High concentrations of the metal and its poisonous volatile compounds in the environment are chiefly responsible for sulfur poisoning. By producing bronchitis, bronchoconstriction, as well as increased pulmonary resistance, sulfur dioxide (SO(2)), a common air pollutant, may have a negative impact on both animal and human health.
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how to calculate balance equations chemistry online?
An essential skill in chemistry is the ability to balance chemical equations, and there are numerous online resources that can assist with this process.
To balance chemical equations, a variety of online tools are accessible. Here are some illustrations: Equations may be balanced for you using the balancer, a straightforward and user-friendly web application. Simply enter the equation, and the balanced equation will appear. Chemical Equation Balancer: Equations with or without oxidation numbers can be balanced using this tool. In order to better comprehend the balancing process, it also offers a step-by-step approach. The WebQC Chemical Equation Balancer is an effective tool for balancing difficult chemical equations. The balanced equation is also shown visually by this. Equation Balancer at Symbol ab: Equation balancer software is available at Symbol ab, a platform for math and science education.
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which particle determines the reactivity of this atom
The quantity of electrons in the outermost shell of an atom determines how reactive it is.
Atoms, which are very small units of matter, are what give a chemical element its particular properties. An atom is composed of a center and one or more negatively charged electrons that orbit it. It's possible to find the positively charged, somewhat large atomic nuclei that make up the nucleus.
The two types of fundamental elements that make up an atom are quarks and protons. An region of electrons surrounds the nucleus of an atom. The electrical charge of the every electron is negative one. The protons and neutrons that make up an atom's nucleus and balance it out are made of quarks.
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As ventricular systole begins, all four heart valves are closed during the:a) ventricular ejection phase.b) isovolumetric contraction phase.c) isovolumetric relaxation phase.d) ventricular filling phase.
As ventricular systole begins, all four heart valves are closed during the isovolumetric contraction phase.
What is the isovolumetric contraction phase?The isovolumetric contraction phase is a phase of the cardiac cycle that occurs during systole, which is the phase of the cardiac cycle when the heart muscle contracts and pumps blood out of the heart.
During the isovolumetric contraction phase, the ventricles of the heart are contracting, but the blood volume in the ventricles remains constant, as the atrioventricular (AV) valves are still closed and the semilunar valves have not yet opened.
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what is the most significant factor in determining the strength of dipole interactions?
The most significant factor in determining the strength of dipole-dipole interactions is the magnitude of the dipole moment of the molecules involved.
The dipole moment is a measure of the separation of charge in a molecule, and it is determined by the difference in electronegativity between the atoms in the molecule and the geometry of the molecule. Molecules with large dipole moments will experience stronger dipole-dipole interactions than molecules with small dipole moments.
Other factors that can affect the strength of dipole interactions include the shape and size of the molecules, the orientation of the dipoles, and the strength of other intermolecular forces present in the system.
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Monosaccharides may link together to form polysaccharides by forming which type of bond?a. hydrogenb. peptidec. ionicd. glycosidic
Monosaccharides may link together to form polysaccharides by forming a glycosidic bond
Simple sugars called monosaccharides can combine to generate polysaccharides through a dehydration reaction. A glycosidic bond, a type of covalent bond, is formed to create this coupling. The hydroxyl group (-OH) of one monosaccharide and the anomeric carbon atom of another monosaccharide combine to form a glycosidic bond.
The characteristics of the resultant polysaccharide depend on the kind of glycosidic bond that forms between the monosaccharides. For instance, the alpha-1,4 glycosidic linkages between the glucose units of a starch molecule, a polysaccharide made of glucose monomers. The molecular structure and properties of cellulose, a distinct polysaccharide made of glucose monomers, are different because of the beta-1,4 glycosidic linkages that connect the glucose units.
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What must break in order for water to change from solid to liquid to gas?A. ionic bondsB. movement of water moleculesC. hydrogen bonds between water moleculesD. nonpolar covalent bonds
Hydrogen bonds between water molecules must break in order for water to change from solid to liquid to gas and the correct option is option C.
What are Hydrogen bonds?A hydrogen bond is a kind of bonding that is present between an atom of hydrogen and a pair of other atoms having a high electronegativity.
Hydrogen-bonding used to be competitively weaker than ionic bonding or covalent bonding, but it is stronger than van der Waals forces.
When the heat is raised (for instance, as water is boiled), the higher kinetic energy of the water molecules causes the hydrogen bonds to break completely and allows water molecules to escape into the air as gas. We observe this gas as water vapor or steam.
Therefore, hydrogen bonds between water molecules must break in order for water to change from solid to liquid to gas and the correct option is option C.
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what form can a toxic substance take
The Toxic materials can be take the form of the solids, the liquids, the gases, the vapors, the dusts, the fumes.
The Toxic materials can be take the form of the solids, the liquids, the gases, the vapors, the dusts, the fumes, the fibers and the mists. The Toxic substances are the substance that can be defined as the broad group of the chemicals that are capable of the causing harm to the plants and the animals including the humans.
The toxic substance is the substance that can be harmful or even the poisonous to the health. The People are mostly concerned about the as the chemicals like polychlorinated biphenyls.
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When 2.0 m aqueous solutions of sodium bicarbonate and hydrochloric acid react, it produces carbon dioxide, water and sodium chloride. calculate the number of moles of carbon dioxide formed if 31.6 ml of sodium bicarbonate reacts with excess hydrochloric acid.
0.0632 moles of carbon dioxide, or CO₂, were produced as a result of the process.
How to calculate the NaHCO₃ mole:
NaHCO₃ has a molarity of 2 M.
The quantity of moles of reactant and product has been determined by the balanced chemical reaction.
Volume = 31.6 mL; 31.6/1000; or, 0.0316 M
NaHCO₃ mole =?
A formula that depicts or demonstrates the smallest and simplest whole number ratio of the atoms of a chemical element present in a chemical compound is known as an empirical formula, also known as the simplest formula in carbon dioxide
Mole = Volume x Molarity
NaHCO₃ mole equals 2 x 0.0316 moles, or 0.0632 moles.
How to calculate the mole of CO₂?
CO₂ + H₂O + NaCl —-> NaHCO₃ + HCl
One mole of NaHCO₃ interacted to create one mole of CO₂ according to the equation that is balanced above.
As a result, 0.0632 moles of NaHCO₃ will react to create 0.0632 moles of CO2.
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what major products are formed when trimyristin is treated with naoh in aqueous ethanol?
Re-extracting trimyristin with Hf in aqueous ethanol results in the production of carboxyl group and glycerol.
What is the ethanol used for?
When diluted, all alcoholic beverages—beer, wine, and spirits—contain ethanol. To stop skin infections, it is a topical component used in cosmetics, perfumes, and pharmaceutical preparations such rub complexes, lotions, tonics, and colognes.
Why does ethanol show up in gas?
Due to its higher octane number than gasoline, ethanol offers better mixing capabilities. Regulations requiring a minimum octane number in fuel avoid engine knocking and guarantee drivability. For environmental purposes, ethanol is less harmful than unblended petrol.
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Will 10g of k2s04 completely dusdolve in 100 g of water at 50 degrees celsius
Yes, 10g of K₂SO₄ will completely dissolve in 100g of water at 50° Celsius.
The solubility of K₂SO₄ at 50 degrees Celsius is 17g per 100g of water. Since the amount of K₂SO₄ being dissolved (10g) is less than the solubility at this temperature (17g), it will completely dissolve.
To calculate solubility, you need to know the maximum amount of solute that can dissolve in a given amount of solvent at a specific temperature. This is known as the solubility limit. Once you know this, you can use the following equation to calculate solubility:
Solubility = (mass of solute) / (mass of solvent)
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is gas a homogeneous mixture
Yes all gases are homogenous mixture.
A homogeneous mixture is defined as a gaseous, liquid or solid mixture that has the same proportions of its components throughout a given sample. It remains uniform in throughout the composition. Basically, there is only one phase of matter observed in a homogeneous mixture.
Generally, in all types of gas mixtures, each component in the gas phase can be treated separately. Each component present in the mixture shares the same temperature and volume. (We must remember that the gases usually expand to fill the volume of their container; gases in a mixture also do that.) However, each gas always has its own pressure.
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A student is investigating the properties of several different minerals in order to identify them. Which of the following describe the streak test the student will be performing on each mineral?
A
a line of ore in the mineral that is a different color
B
a crystal in the mineral that is a different color
C
the color of the powder a mineral makes
D
the color of the outside of the mineral
The streak test involves determining the color of the powder produced by rubbing a mineral against an unglazed porcelain plate. Therefore, the answer is (C) the color of the powder a mineral makes.
What is mineral?A mineral is a naturally occurring inorganic solid with a specific chemical composition and a crystalline structure. Minerals are the building blocks of rocks, and they form through a variety of geological processes, such as cooling and solidification of magma, precipitation from hot water solutions, and alteration by pressure and heat. There are thousands of different minerals, each with its own unique properties and characteristics. Some minerals, such as quartz and feldspar, are very common in the Earth's crust, while others, such as diamond and gold, are rare and highly valued.
Here,
This test can be useful in mineral identification because some minerals may have a different color streak than their outward appearance, due to variations in the composition of the mineral. For example, hematite, which is commonly a dark gray or black color, produces a reddish-brown streak. Similarly, pyrite, which is often a brassy yellow color, produces a greenish-black streak. By performing a streak test, the student can gather more information about the mineral and use that information to help identify it.
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what is periodic table atomic mass?
Generally, the atomic mass is defined as a weighted average of all of the isotopes present in that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope.
Atomic number is defined as the number of protons present in the nucleus (which is the same as the number of electrons in the atom). Basically a one or two letter symbol that represents the element. These are internationally-used symbols and abbreviations for the common name or the Latin name of the element.
Generally, the atomic mass is the average number of protons and neutrons in atoms of a chemical elements, which allows for the natural abundances of the element's isotopes.
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describe how the law of conservation of mass is useful for chemical changes
The law of conservation of the mass is useful for the chemical changes as if the substance undergoes the chemical change, the product will have the same mass though it.
The law of conservation of the mass states that the mass is neither created nor be destroyed, it can be only transformed. The mass of the product formed is exactly equal to the mass of the reactants. If the original substance will undergoes the chemical change, the product formed will have the equal mass of the reactant though it can be present in the another form.
Thus, the law of the conservation of mass is related to the chemical change as the mass neither be created nor be destroyed.
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The reaction Fe (s) + Cl2 (g)→ FeCl2 (s) has a ΔH=−342kJ .
How much heat will be required to produce 1 mole of Fe by the reverse reaction?
A. -342 kj
B. -172 kj
C. 342 kj
D. 684 kj
Answer:
-342kj
Explanation:
Just did the test.
1 mole of Fe by the reverse reaction The correct answer is D. 684 k.
What is mole?Mole is a unit of measurement used in chemistry to measure the amount of a substance. The mole is equal to the atomic mass of a substance expressed in grams. It is used to measure the amount of a substance, usually in moles per liter. The mole is also used to calculate the number of atoms, molecules, and other particles in a given volume or mass. The mole is an important concept in chemistry, and is used in many calculations related to chemical reactions, such as the calculation of molecular weights, reaction rates, and stoichiometry.
The reverse reaction of Fe (s) + Cl2 (g) → FeCl2 (s) is FeCl2 (s) → Fe (s) + Cl2 (g). The change in enthalpy (ΔH) is the amount of energy released or absorbed in a chemical reaction. In this case, the reaction has a ΔH of -342 kJ, meaning that 342 kJ of energy is released. To produce 1 mole of Fe by the reverse reaction, 684 kJ of energy must be absorbed, which is equal to twice the ΔH of -342 kJ. Therefore, the correct answer is D. 684 kJ.
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