The mass of the glycerin, C₃H₈O₃ a nonelectrolyte, that must be dissolved in 200.0 g water to give a solution with the freezing point of -1.50 °C is 14.8 g.
Mass of solvent = 200.0 g
Depression at freezing point = - 1.50 °C
Kf = 1.86 °C / m
The molality is given as :
0 - ΔT = Kf × m × i
Where ,
ΔT = - 1.50 °C
Kf = 1.86 °C / m
m = molality = ?
i = 1
m = 1.50 / 1.86
m = 0.806 m
The molality = ( mass of solute × 1000) / ( molar mass of solute × mass of solvent)
Mass of solute =( 0.806 × 92 × 200 ) / 1000
Mass of the solute = 14.8 g
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How many moles of NaN3 are needed to make 6.25 moles of N2?
Answer:
4.17
Explanation:
The balanced chemical equation for the reaction of NaN3 to form N2 is:
2 NaN3 -> 3 N2 + 2 Na
This equation shows that 2 moles of NaN3 produce 3 moles of N2. We can set up a proportion to find out how many moles of NaN3 are needed to make 6.25 moles of N2:
2 moles of NaN3 : 3 moles of N2 = x moles of NaN3 : 6.25 moles of N2
To solve for x, we can cross-multiply and simplify:
2 × 6.25 moles of NaN3 = 3 × x
12.5 moles of NaN3 = 3x
x = 12.5 / 3 = 4.17 moles of NaN3
Therefore, 4.17 moles of NaN3 are needed to make 6.25 moles of N2.
Convert 6.94 mol Na2SO4 to mass of NaOH. Please round two digits after the decimal point. Pls don't forget the substances and units.
Balanced equation:
CaSO4+2NaOH--> Na2SO4+ Ca(OH)2
Thank you in advance!!
Answer:
The given balanced equation is not relevant to the conversion of 6.94 mol Na2SO4 to the mass of NaOH. However, we can use stoichiometry to calculate the amount of NaOH required to react with 6.94 mol of Na2SO4.
From the balanced equation, we can see that 1 mole of Na2SO4 reacts with 2 moles of NaOH. Therefore, we can calculate the number of moles of NaOH required as follows:
Number of moles of NaOH = 6.94 mol Na2SO4 x (2 mol NaOH / 1 mol Na2SO4) = 13.88 mol NaOH
Now, we can use the molar mass of NaOH to calculate the mass of NaOH required:
Mass of NaOH = number of moles of NaOH x molar mass of NaOH
= 13.88 mol NaOH x 40.00 g/mol NaOH
= 555.20 g NaOH
Therefore, 6.94 mol of Na2SO4 requires 555.20 g of NaOH to react completely.
Note: It's important to specify the substances and units in the answer, as requested.
What are three properties of covalent bonds and three properties of Ionic bonds?
Answer:
Three properties of covalent bonds are low melting and boiling points, softer than ionic bonds, don't dissolve well in the water.
Three properties of ionic bonds are high melting as well as boiling points, hard and brittle in nature and conduct electricity when dissolved in water.
Which acid is commonly responsible for the dissolution of limestone? Carbonic Sulfuric Nitric Hydrochloric
Answer: A: Carbonic
Explanation: Quizlet confirmed
What is likely to be true about the ∆H for this reaction?
C2H6 (l) → C2H6 (s)
A. ∆H>0
B. ∆H<0
C. ∆H=0
Answer:
B. ∆H<0
Explanation:
The change in enthalpy (∆H) for a reaction is a measure of the amount of heat that is absorbed or released during the reaction. A positive ∆H indicates that the reaction is endothermic, meaning that heat is absorbed during the reaction. A negative ∆H indicates that the reaction is exothermic, meaning that heat is released during the reaction. A ∆H of zero indicates that the reaction is thermally neutral, meaning that there is no heat transfer during the reaction.
In the given reaction, C2H6 (l) → C2H6 (s), the substance changes from a liquid to a solid, which typically involves a decrease in entropy (or disorder) of the system. This means that the reaction is exothermic, because the decrease in entropy is usually accompanied by a release of heat. Therefore, we would expect the ∆H for this reaction to be negative, which means that B. ∆H<0 is likely to be true for this reaction.
What is the molar mass of O in grams?
16 gm/mol is the Molar mass of O.
O is the symbol for the element oxygen, which is a diatomic gas with a molar mass of approximately 32 g/mol. This means that one mole of oxygen atoms, which is equivalent to 6.022 x 10^23 atoms, has a mass of 32 grams.
The molar mass of oxygen is calculated by adding the atomic mass of one oxygen atom, which is 16 g/mol, to itself because there are two oxygen atoms in each molecule of oxygen gas. Therefore, the molar mass of O is equal to 2 x 16 g/mol, or 32 g/mol. This is useful information for chemists and scientists who need to perform calculations and measurements involving the amount of oxygen present in a sample of a substance.
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ethylene glycol is a liquid at room temperature and is soluble in water in all proportions. however, butane is a compound of similar molecular weight, but it is a gas at room temp and is insolube in water. how do you account for these diffeernces
ethylene glycol(CH2OH-CH2OH) is a liquid at room temperature and is soluble in water in all proportions; it is the liquid used in car radiators as antifreeze.
What is the main effect of ethylene?Ethylene effects include: fruit ripening, induction of flowering, loss of chlorophyll, abortion of plant parts, stem shortening, abscission (dropping) of plant parts, epinasty (stems bend), and dormancy. It can be produced when plants are injured, either mechanically or by disease.
Where is ethylene produced?Ethylene has historically been made from petroleum, but the production has been transitioning to using natural gas. The principal method of producing ethylene is steam cracking, a process which breaks down hydrocarbons through the refining of petroleum or natural gas.
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what will be the result if heat is added to an endothermic reaction?
The result if heat is added to an endothermic reaction is that it will increasing the amounts of the products and will decreasing the amounts of the reactants.
If the reaction is the endothermic reaction and if we add the heat to the endothermic reaction then it will increase in the temperature and it will cause the forward reaction to occur, and increasing the amounts of the products and will decreasing the amounts of the reactants. The Lowering of the temperature will be produce the opposite of the response.
Thus, the increase in the amount of the product occurs if we add the heat to the endothermic reaction.
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what is the angle of the tetrahedral bond?
109.5
when we see it in 3d dimension...the repulsion force of the bonding pairs maximaze the distance from each other, thus making the angle 109.5
How do you find the boiling point given vapor pressure?
The boiling point of a liquid can be estimated from its vapor pressure using the Clausius-Clapeyron equation.
This equation relates the vapor pressure of a liquid to its boiling point and can be expressed as:
ln(P2/P1) = -ΔHvap/R * (1/T2 - 1/T1)
where P1 is the vapor pressure at temperature T1, P2 is the vapor pressure at temperature T2, ΔHvap is the enthalpy of vaporization, R is the gas constant, and ln denotes the natural logarithm.
To find the boiling point, you would need to know the vapor pressure at two temperatures and the enthalpy of vaporization. Rearranging the equation to solve for the boiling point, you would get:
T2 = -ΔHvap/R * (1/(ln(P2/P1)) + 1/T1)
Substituting the values of P1, P2, and T1 into the equation and solving for T2 will give you an estimate of the boiling point. Note that this equation is an approximation and assumes that the enthalpy of vaporization is constant over the temperature range of interest.
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aluminum reacts with excess hydrochloric acid to form aqueous aluminum chloride and of hydrogen gas over water at and . how many grams of aluminum reacted? the partial pressure of water at is . round your answer to significant figures.
Answer:0.0324
g Al
Explanation:We're asked to find the number of grams of
Al
that reacted, given some
H
2
(
g
)
product characteristics.
Let's first write the chemical equation for this reaction:
2
Al
(
s
)
+
6
HCl
(
a
q
)
→
2
AlCl
3
(
a
q
)
+
3
H
2
(
g
)
The total pressure of the gaseous system is given as
751
mm Hg
, and the partial pressure of water vapor is
26.8
mm Hg
at
27
o
C
. The pressure of hydrogen gas is thus
P
total
=
P
H
2
O
+
P
H
2
P
H
2
=
751
mm Hg
−
26.8
mm Hg
=
724
mm Hg
This pressure in atmospheres is
724
mm Hg
(
1
l
atm
760
mm Hg
)
=
0.953
atm
We'll now use the ideal gas equation to find the number of moles of
H
2
formed:
(
T
=
27
o
C
+
273
=
300
K
)
n
=
P
V
R
T
=
(
0.953
atm
)
(
0.0465
L
)
(
0.082057
L
∙
atm
mol
∙
K
)
(
300
K
)
=
0.00180
mol H
2
(volume converted to liters here)
Using the coefficients of the chemical equation, we'll now find the relative number of moles of
Al
that react:
0.00180
mol H
2
(
2
l
mol Al
3
mol H
2
)
=
0.00120
mol Al
Lastly, we'll use the molar mass of aluminum (
26.98
g/mol
) to find the number of grams that reacted:
0.00120
mol Al
(
26.98
l
g Al
1
mol Al
)
=
0.0324
g Al
Thus,
0.0324
grams of aluminum
reacted.
rank the following compounds in order of increasing strength of intermolecular forces, putting the molecule with the weakest intermolecular force first.
The order of increasing strength of intermolecular forces can be determined by considering the molecular structure, molecular weight, and polarity of the compounds. The compounds are:
Methane (CH4)Ethanol (C2H5OH)Propanone (CH3COCH3)Ethanoic acid (CH3COOH)What do mean by intermolecular forces?
Intermolecular forces are the attractive or repulsive forces that exist between molecules in a substance. These forces arise due to the interaction of the electric charges present on the molecules. Intermolecular forces are responsible for many of the physical properties of a substance, such as boiling point, melting point, viscosity, and surface tension.
The ranking of the compounds based on the strength of their intermolecular forces, from weakest to strongest, is as follows:
Methane (CH4)Methane is a nonpolar molecule, and its only intermolecular force is London dispersion forces, which are relatively weak compared to the other intermolecular forces.
Ethanol (C2H5OH)Ethanol is a polar molecule that has hydrogen bonding, dipole-dipole interactions, and London dispersion forces. However, its intermolecular forces are weaker than those of propanone and ethanoic acid due to its smaller size.
Propanone (CH3COCH3)Propanone is a polar molecule that has dipole-dipole interactions and London dispersion forces. It is larger than ethanol, so its intermolecular forces are stronger than ethanol's.
Ethanoic acid (CH3COOH)Ethanoic acid is a polar molecule that has hydrogen bonding, dipole-dipole interactions, and London dispersion forces. The presence of hydrogen bonding in ethanoic acid gives it the strongest intermolecular forces out of the four compounds.
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Marsupials are a group of mammals that give birth to very immature young and raise them in a pouch. Opossums, kangaroos, and Tasmanian devils are all marsupials. Marsupials are common in Australia and South America. Previously scientists thought marsupials originated in Australia, but new evidence confirmed that all marsupials evolved from a common ancestor in South America. What is the most likely explanation for why marsupials are related in Australia and South America? Group of answer choices A huge asteroid struck Earth and the impact broke the two continents apart. An ice age froze the ocean surface and marsupials migrated to Australia. The continents were once joined into a supercontinent that slowly broke apart. A series of earthquakes and volcanoes separated the two continents.
About 100 million years ago, in South America, marsupials first appeared. Australia, Antarctica, and South America were all connected at the time to form one large continent. Australia and Antarctica gradually separated from South America and developed into independent continents.
Why is marsupials more in Australia than South America ?
The diversity of marsupials is thought to be higher in Australia than in South America because there were no terrestrial placental mammals there in prehistoric Australia to compete with marsupials. The only other large mammal that uses hopping as its main mode of propulsion is the kangaroo.
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What is NO compound called?
NO is called nitric oxide.
NO is a chemical compound composed of one nitrogen atom and one oxygen atom. It is a colorless gas that is a free radical, meaning it has an unpaired electron. Nitric oxide is an important signaling molecule in many physiological and pathological processes in the human body.
It plays a crucial role in the regulation of blood pressure, immune system function, and neurotransmission. Nitric oxide is also involved in the formation of smog and acid rain in the atmosphere, as well as in the production of fertilizers and explosives in industry.
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the ability of matter to combine chemically with other substances
Chemical combination refers to the ability of matter to react with other substances and form new compounds.
Atoms, which are the basic units of matter, can combine with each other through various chemical bonds to form molecules. These molecules can then react with other molecules to form new compounds with different properties.
The ability of matter to combine chemically is determined by the electron configuration of the atoms. Atoms with incomplete electron shells tend to be more reactive and can easily form chemical bonds with other atoms. This ability to form chemical bonds allows for the formation of complex molecules and compounds, which are essential for life and many technological advancements.
Chemical combination plays a critical role in various fields such as medicine, agriculture, and materials science. Understanding the principles of chemical combination can help us design new molecules and compounds with desired properties and functions, leading to the development of new technologies and products.
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The reaction of benzaldehyde with acetone and sodium hydroxide produces ____________ This is an example of ____________ reaction.
a. stilbene
b. dibenzylideneacetone
c. benzocaine
d. anthracene
e. triphenyl methanol
The reaction of benzaldehyde with acetone and sodium hydroxide produces dibenzylideneacetone. This is an example of a condensation reaction, specifically a crossed aldol condensation.
In this reaction, benzaldehyde and acetone undergo a nucleophilic addition reaction with the strong base sodium hydroxide. The sodium hydroxide deprotonates the alpha-carbon of the carbonyl group in both benzaldehyde and acetone, creating nucleophilic enolate intermediates. The enolate of acetone then attacks the carbonyl group of benzaldehyde, forming an intermediate that subsequently loses a water molecule, leading to the formation of dibenzylideneacetone.
Dibenzylideneacetone is a yellow solid and is used as a UV absorber, as a flavoring agent, and in the preparation of fragrances. The crossed aldol condensation reaction is an important synthetic route to form α,β-unsaturated carbonyl compounds, which have numerous applications in organic chemistry.
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Use the model for double replacement reactions to predict the products for the following reactants. Circle the ionic solution and underline the other compound.
Ca(OH2(aq) + 2HCl(aq) —->
The double replacement reaction generally results in the formation of precipitate. Here the products of the given reaction are CaCl₂ and H₂O and the ionic solution is CaCl₂.
What is double replacement reaction?The chemical reaction in which two chemical substances react by exchanging the ions to form two new molecules. In this reactions, positive ions exchange negative ions. A double displacement is also called the double decomposition reaction.
In general the reaction can be given as:
AB + CD → AD + CB
The reaction of Ca (OH)₂ with HCl is:
Ca (OH)₂ + 2HCl → CaCl₂ + 2 H₂O
Thus here the given reaction is double displacement, CaCl₂ is the ionic compound and other compound is water.
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when a utensil is stored in water between uses, what are the requirements? answer choices A. running water at any temperature, or a container of water at 70 degrees F or lower B. running water at any temperature, or a container of water at 135 degrees F of higherC. running water at 70 degrees F or lower, or a container of water at 70 degrees F or lower D. running water at 135 degrees F or higher, or a container of water at 135 degrees F or higher
When a utensil is stored in water between uses, the requirements are running water at 135 degrees F or higher, or a container of water at 135 degrees F or higher. So, correct answer is option (D).
A safe food that require controlled time and temperature is known as TCS food, include milk and dairy products, eggs, and meat (beef, pork, lamb). The
utensil should be placed over the rim of the container with the handle facing up. Plates without TCS can be placed on clean, sanitized surfaces that come in contact with food. Some spoons or ladles can be kept under running water. Periodically store used tools in a container of water maintained at 135 degree F (57°C) or higher and clean tools and containers at least every 24 hours or as often as necessary to prevent dirt build-up.
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Which proportionality applies to Avogadro's law?
O V 1/P
O V T
O P T
O V n
V n is the proportionality that applies to Avogadro's law. Therefore, the correct option is option D.
What is Avogadro's law?According to Avogadro's law, equal volumes of various gases each contain an equal amount of molecules at the same temperature and pressure. On the presumption of an ideal (perfect) gas, this experimental relation can be deduced first from kinetic theory of gases. For actual gases, the law is roughly applicable when temperatures and pressures are both low enough.
Avogadro's number, or even the Avogadro constant, is the precise quantity of molecules inside one gram-mole of such a material, defined as that of the molecular weight metric grams, which is equal to 6.022×10²³.
Avogadro’s law
V1/n1=V2/n2 or Vn=k.
Therefore, the correct option is option D.
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Describe the properties of solutions of gases in liquids Question The solubility of a gas in water will typically decrease most with Select the correct answer below: a) increasing polarity. b) decreasing polarity. c) decreasing temperature. d) increasing pressure.
With an increase in pressure, gases become more soluble in water. At a particular temperature, an increase in pressure causes a gas to become more soluble in a liquid.
The gas particles have more kinetic energy as the temperature rises, which causes them to travel more quickly and cause them to escape the liquid. As a result, solubility declines as temperature rises. The solubility will be larger the lower the temperature.
Temperature increases result in an increase in the number of gas molecules or atoms that are stimulated, which improves the solubility of solids in water but decreases the solubility of gases in water. The solubility of solids and liquids is basically unaffected by changes in pressure.
In contrast, a drop increase in pressure causes a gas to become less soluble, and a rise in temperature causes a gas to become less soluble in a liquid.
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In which reaction does the oxidation number of oxygen increase?
a. Ba(NO3)2(aq)+K2SO4(aq) → BaSO4(s)+2KNO3()aq
b. HCL(aq)+NaOH(aq) → NaCl(aq)+H2O(l)
c. MgO(s)+H2O(l) → Mg(OH)2(s)
d. 2SO2(g)+O2(g) →2SO3(g)
e. 2H2O(l) → 2H2(g)+O2(g)
2H2O(l) → 2H2(g)+O2(g) We must calculate the oxidation number of oxygen in each process in order to ascertain which one of the reactions results in an increase in oxygen's oxidation state. The correct option is E.
Why is it called oxidation?Antoine Lavoisier used the term "oxidation" to describe the interaction of a material with oxygen. The definition was eventually expanded to cover additional processes in which electrons are lost, regardless of whether oxygen was present, because it was understood that the material loses electrons when it is oxidised.
When does oxidation take place?No of the form of electrical cell, oxidation always occurs at the anode. Galvanic and electrolytic cells have reversible anode and cathode charges. The cathodes and anodes of electrolytic cells are designated negatively and positively, respectively.
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Draw the structure of 3‑methylbenzoic acid in the space. Based on the given structure, predict the polarity of this compound? a. nonpolar b. polar
According to the structure of the3- methyl benzoic acid in space, it is polar in nature due the presence of carboxyl group and the slightly polar benzene ring. So option B is correct.
Here is the structure of the 3-methylbenzoic acid in space. For the proper structure, refer to the image attachment in this answer.
H
|
C
/ \
C O-H
/ \
C C
/ \
H CH3
In order to predict the polarity of any compound, it is essential to consider the electronegativity of the atoms involved in the formation of the molecule. In the case of 3-methylbenzoic acid, the oxygen atom in the carboxyl group (COOH) is highly electronegative, so it creates a polarity between the oxygen and carbon atoms. Also, the benzene ring has a slightly polar character due to the presence of double bonded carbon-carbon atoms. Therefore, the 3-methylbenzoic acid molecule is polar in nature due to the presence of the carboxyl group and also due to slightly polar benzene ring.
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what is element whose symbol, hg,
HELP! Out of the following compounds, identify the ones that are
polar covalent.
H2O
NCl3
AuCl3
ClO2
SF4
SO3
ClO[tex]_2[/tex], H[tex]_2[/tex]O are the polar covalent compounds, since all of these chemicals have a dipole moment.
What is polar covalent compound?Polar covalent compounds are electrical conductors. Polar compounds comprise chemical compounds held together through polar covalent bonds.
A polar compound is a chemical species that has two or even more atoms that are linked together by polar covalent bonds that share electrons irregularly. ClO[tex]_2[/tex], H[tex]_2[/tex]O are the polar covalent compounds, since all of these chemicals have a dipole moment.
Therefore, ClO[tex]_2[/tex], H[tex]_2[/tex]O are the polar covalent compounds.
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what atom is weakly electronegative and would be more stable if it gave up a valence electron?
Potassium atom is weakly electronegative and would be more stable if it gave up a valence electron.
The propensity of an element to draw a pair of bonding electrons is measured by its electronegativity. The Pauling measure is most frequently employed. The number ranges from 4.0 for fluorine, the most electronegative element, to 0.7 for cesium and francium, the least electronegative elements.
What happens if two elements with equivalent electronegativity combine?
Think about the connection between elements A and B. Since both atoms have the same propensity to attract the bonding pair of electrons if they are equally electronegative, it will typically be located halfway between the two atoms.
Normally, A and B would have to be the same atom to form a connection like this. This kind of bond can be found in compounds like H2 or Cl2, for instance. It's essential to keep in mind that this is a typical image. Actually, the electrons are in a molecule orbital, where they are constantly revolving. The electrons in this type of connection are distributed equally between the two atoms, making it a "pure" covalent bond.
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what is atomic mass of sodium
Answer:
The atomic mass of sodium is 23 g/mol
Explanation:
Sodium's atomic mass is 11 + 12 = 23. As a result, 1 mole of sodium equals 23 grams. We know that because sodium's atomic mass is 23, we can write it as 23 g/mol.
what is perchloric acid formula?
The formula for perchloric acid is HClO₄.
Perchloric acid is a strong mineral acid that contains a central chlorine atom bonded to four oxygen atoms and a hydrogen atom. It is a colorless and odorless liquid that is highly corrosive and reactive, making it a potent oxidizer.
Perchloric acid is commonly used in laboratory and industrial settings for its strong oxidizing properties and ability to dissolve a variety of metals and organic compounds. It must be handled with care due to its potential to form explosive salts with organic materials and other reducing agents.
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What are 10 examples of homogeneous mixtures?
Answer:
In chemistry, a mixture is a substance made up of 2 or more substances that are not chemically combined, but physically combined. This means there are no chemical bonds between the different substances in a homogeneous or heterogeneous mixture. You can think of a salad as an example of a mixture— lettuce, tomatoes, cucumbers, and Parmesan cheese are substances, and each substance retains its own chemical composition and identity.
A homogeneous mixture (from the root “homo” meaning same) has a uniform composition throughout. Furthermore, in a homogeneous mixture, all substances exist in one state of matter. Liquids can be homogeneously mixed with liquids, solids with solids, and so on.
Examples :
1)Saltwater
If salt dissolves in water, it disperses evenly throughout the water. Note that seawater can be heterogeneous if pieces of particulate matter are present, as in nature.
2)Coffee, milk
These drinks consist of many chemicals dissolved in water, spread evenly like in saltwater. However, when milk curdles, it becomes a heterogeneous mixture.
3)Cement, glue
These are homogeneous mixtures of chemicals that set (harden) on drying or exposure to other special conditions. They may have other things added which could make them heterogeneous.
4)Bronze, steel
These are alloys, made by mixing copper and tin (for bronze) or iron and carbon (for steel). Because the resulting mixtures do not have distinguishable regions of each component, they are homogeneous.
5)Air
Air is a mixture of gases spread evenly throughout the atmosphere. Because gas molecules are distant from one another, they always mix evenly and do not form heterogeneous mixtures.
Other examples include :
6)Mouthwash
7)Detergent
8)Cologne
9)Jello gelatin
10) Sugar syrup
Can you choose whether or not each type of glassware can be heated test tubes?
Borosilicate glass test tubes typically work well for heating because they can endure high temperatures without cracking or breaking.
Some forms of glass, such soda-lime glass, may not be able to resist high temperatures and may shatter or break when heated, such as test tubes.
Before to heating glassware, it is crucial to always review the manufacturer's instructions for that particular type of glassware. Also, heated glassware should be handled carefully because it can get quite hot and result in burns or other injuries.
While handling hot glassware, always use the proper safety gear, such as heat-resistant gloves or tongs.
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Transcribed image text: Select the solvents that are commonly used to prepare a sample for 'H NMR. deuterium oxide SOOS O ✓ acetone acetone-do chloroform-d dimethyl sulfoxide Incorrect
Deuterium oxide is a typical solvent used to prepare a sample for H1 NMR. result, choice A is accurate.
The nuclei respond by emitting an electromagnetic signal with a frequency characteristic of the magnetic field at the nucleus when they are perturbed by a mild oscillating magnetic field in a strong constant magnetic field. Nuclear magnetic resonance (NMR) is the term for this phenomena (NMR).
Because to its broad range of solvent constraints, simple spectra, and high boiling point, DMSO is the most popular organic solvent for NMR study.
When organic molecules and heavy water interact with one other in the presence of the right catalyst, deuterium solvents are produced.Occasionally, chloroform was used as a drug or in attempts. Chloroform might work by accelerating the passage of potassium ions through certain potassium channels located in nerve cells.
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