CHEMISTRY HIGH SCHOOL

What is meant by the solubility of a substance?and
What conditions must be specified when expressing the solubility of a substance

Answers

Answer 1
Answer:

Solubility means the ability of a solute to dissolve in solvent to form a solution.

The temperature and pressure must be specified when expressing the solubility of a substance.

What is solubility?

Solubility is defined as the maximum amount of a substance that will dissolve in a given amount of solvent at a particular temperature.

The solute can be a solid, liquid or a gas.

The solubility of a solid or a liquid solute in a solvent is affected by the temperature, while the solubility of a gaseous solute is affected by both the temperature and the pressure of the gas.

Temperature must be specified because solubility varies with temperature. For gases, the pressure must also be specified. Solubility is specific for a particular solvent.

Therefore, Solubility means the ability of a solute to dissolve in solvent to form a solution.

The temperature and pressure must be specified when expressing the solubility of a substance.

Learn more about Solubility, here:

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Answer 2
Answer: Solubility is the property of a substance (any state of matter) to whether it can be dissolved. So if a substance is soluble (i.e. salt - in water) it dissolves easily. If it is insoluble, then it does not dissolve. 
Conditions that must be specified include the solute (the substance that is dissolved, such as the salt) and the solvent (the liquid in which the solute is dissolved).

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What is the molality of a solution containing 125 grams of iodine (I2) and 750 grams of CCl4? A. 1.2 m. . B. 6.57 m. . C. 0.657 m. . D. 0.12 m.

Answers

The answer is C. 0.657 m.

The molality is the number of moles of solute divided by kilograms of solvent. In a solution, solute the component which is present in lesser amount while solvent is present in greater amount. Thus, I2 is solute, and CCl4 is solvent.

So, first we need to calculate moles of I2:
Atomic mass of iodine: A(I) = 126.9
Molecular mass of iodine: Mr(I2) = 2*A(I) = 2 * 126.9 = 253.8
This means there are 253.8 g of iodine in 1 mole. So, 125 g of iodine will be in how many moles?
253.8 : 1 = 125 : x         ⇒      x = 125/253.8 = 0.493 moles

Now, let's convert amount of CCl4 in kilograms (1 kg = 1000 g):
750 g = 750/1000 kg = 0.75 kg

And now, it's only left to calculate molality of the solution:
numbers of moles of solute/kilograms of solvent = 0.493 moles/0.75 kg = 0.657 m

Based on intermolecular forces, which of these substances would have the highest boiling point?(1) He (3) CH4
(2) O2 (4) NH3

Answers

NH3 would have the highest boiling point because the molecules have all 3 types of bonds:
London dispersion, because all molecules do
Hydrogen Bond, because of the fact that hydrogen is present and so is Nitrogen, one of the elements that hydrogen will form a hydrogen bond with.
Dipole Bond: Because the NH3 has a lone pair

Answer: NH3

Hope this helped!!!
Based on intermolecular forces, NH3 would have the highest boiling point. 

Which is an example of a response?a. water lost from the lungs during breathing
b. ivy growing around the pole of a fence
c. the angle of the sun changing during the day
d. outside temperature dropping at night

Answers

The anwser is B.ivy growing aroung the pole of a fence I just took this test

N2 + 3H2 Right arrow. 2NH3 What is the percent yield of NH3 if the reaction of 26.3 g of H2 produces 79.0 g of NH3? Use Percent yield equals StartFraction actual yield over theoretical yield EndFraction times 100..

Answers

Answer:

53.4%

Explanation:

N₂ + 3H₂ → 2NH₃

Given that:

26.3 g of H₂ react with N₂ to produce 79.0 g of NH₃

Then:

The number of moles of H₂ = 26.3g of H₂ * (1 mol of H₂/ 2.02g of H₂)

= 13.05 mol of H₂

The number of moles of NH₃ = 13.05 mol of H₂ * ( 2mol of NH₃/ 3 mol of H₂)

= 8.697 mol of NH₃

The mass of NH₃ = 8.697 mol of NH₃ *( 17.04g of NH₃/ 1 mol of NH₃) = 148.1 g of NH₃

The percent yield = actual yield/ theoretical yield * 100%

The percent yield = ( 79.0 g/ 148.1 g )* 100%

The percent yield ≅ 53.4 %

Answer:

53.4

Explanation:

Write your question here (Keep it simple and clear to get the best answer)how can the boiling point of a liquid raised without adding soluble impurities?

Answers

The boiling point of a liquid can be raised by adding pressure. Like wise, if you lower the pressure the boiling point goes down. This can be explained by the fact that boiling occurse when the vapor pressure equals the outside pressure so when the outside pressure rises the vapor pressure required for boiling also rises. Vapor pressure is proportional to temperature and therefore temperature needs to increase to make the vapor pressure increase. I hope this helps. Let me know in the comments if anything is unclear or if you want me to explain anything further.

A student is using a copper strip and a strong chlorine solution in her experiment. Which of these is a chemical property of one of her materials?

Answers

There are many chemical properties could define the copper strip and a chlorine solution. For an example, the reactivity of copper strip. The Reactivity refers to the tendency of the copper strip to undergo chemical reaction with the chlorine solution.
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