Question 1

Which of the following best describes what happens to the pressure of a gas when the temperature is increased while the volume remains constant, according to the ideal gas law?

Accepted Answer

The pressure increases because the gas particles move faster and collide with the walls more frequently.

Question 2

A solution has a concentration of $$3.87 	imes 10$$^{-3}$$ mol/L. What is this value in standard notation?

Accepted Answer

$$0.00387$$ mol/L

Question 3

Which of the following is the correct balanced chemical equation for the reaction between hydrochloric acid (HCl) and aqueous silver nitrate (AgNO$$_3$$)?

Accepted Answer

$$\mathrm{HCl} (aq) + \mathrm{AgNO}_3 (aq) \rightarrow \mathrm{AgCl} (s) + \mathrm{HNO}_3 (aq)$$

Question 4

If $$7.6 	imes 10^4$ is written in standard notation, what is the value?

Accepted Answer

$$760,000$$

Question 5

Which of the following statements best explains what happens when heat is added to a system at constant pressure?

Accepted Answer

The system absorbs energy, which may increase its temperature or cause a phase change.

Question 6

A student is asked to balance the following equation: $$\mathrm{Na} + \mathrm{Cl}_2 \rightarrow \mathrm{NaCl}. $$Which of the following is the correct balanced equation?

Accepted Answer

$$2\mathrm{Na} + \mathrm{Cl}_2 \rightarrow 2\mathrm{NaCl}$$

Question 7

Which of the following best describes the process of writing a chemical equation in balanced form?

Accepted Answer

Ensuring the number of atoms of each element is the same on both sides of the equation.

Question 8

A gas is compressed at constant temperature from a volume of $$4.0 L to$$ $$2.0 L. If $$the initial pressure was $$1.0$$ atm, what is the final pressure? (Assume ideal gas behavior.)

Accepted Answer

$$2.0$$ atm

Question 9

Which of the following is the correct scientific notation for $$0.00052$$?

Accepted Answer

$$5.2 	imes 10$$^{-4}$$

Question 10

When a chemical reaction occurs in an open beaker and heat is released to the surroundings, which term best describes the reaction?

Accepted Answer

Exothermic

Question 11

A student mixes $$50 mL of$$ $$1.0 M $$HCl with $$50 mL of$$ $$1.0 M $$NaOH. What is the total number of moles of water produced? (Reaction: $$\mathrm{HCl} + \mathrm{NaOH} \rightarrow \mathrm{NaCl} + \mathrm{H}_2\mathrm{O})$$

Accepted Answer

$$0.050$$ mol

Question 12

Which of the following is a correct statement about the law of conservation of mass as it applies to chemical reactions?

Accepted Answer

The total mass of reactants equals the total mass of products.

Question 13

A sample of gas occupies $$10.0 L at$$ $$300 K $$and $$1.0$$ atm. If the temperature is increased to $$600 K $$and the pressure is increased to $$2.0$$ atm, what is the new volume?

Accepted Answer

$$5.0 L$$

Question 14

Which of the following best describes a solution?

Accepted Answer

A homogeneous mixture of two or more substances.

Question 15

Which of the following is the correct net ionic equation for the reaction between HCl and AgNO$$_3$$?

Accepted Answer

$$\mathrm{Cl}^- (aq) + \mathrm{Ag}^+ (aq) \rightarrow \mathrm{AgCl} (s)$$

Question 16

A student needs to prepare $$250 mL of a$$ $$0.10 M $$NaCl solution. How many moles of NaCl are required?

Accepted Answer

$$0.025$$ mol

Question 17

Which of the following is the correct scientific notation for $$760,000$$?

Accepted Answer

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