Q: Which of the following is the correct value and equation for the ion product constant of water ($$K_w) at$$ $$25^\circC$$?

$$K_w = [H_3O^+][OH^-] = 1.0 \times 10$$^{-14}$$

Question 1

Which of the following statements best describes 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 in a chemical reaction.

Question 2

A sample contains $$3.01 	imes 10$$^{23}$$ molecules of CO_2$. How many moles of CO_2$ are present in the sample? (Avogadro's number = 6.02$$ 	imes $$10^{23}$$ mol$$^{-1})$$

Accepted Answer

$$0.50$$ mol

Question 3

Which of the following compounds is insoluble in water according to the solubility rules?

Accepted Answer

$$AgCl$$

Question 4

Which of the following is a balanced chemical equation for the combustion of methane ($$CH_4) in $$oxygen?

Accepted Answer

$$CH_4 + 2O_2$$ \rightarrow $$CO_2 + 2H_2O$

Question 5

A reaction has a theoretical yield of $$10.0 g$$, but only $$7.5 g of $$product is actually obtained. What is the percent yield?

Accepted Answer

$$75\%$$

Question 6

Which of the following best describes a redox reaction?

Accepted Answer

A reaction in which electrons are transferred between species.

Question 7

A $$2.00 L $$container holds $$0.50$$ mol of $$O_2$$ gas at $$300 K. $$What is the pressure in the container? (Use $$R = 0.0821 L$$·atm·mol$$^{-1}$$·K$$^{-1})$$

Accepted Answer

Question 8

Which of the following intermolecular forces is present in all molecular substances, regardless of their polarity?

Accepted Answer

Dispersion (London) forces

Question 9

Which of the following solutions is considered saturated?

Accepted Answer

A solution in which no more solute can dissolve at a given temperature.

Question 10

What is the molarity of a solution prepared by dissolving $$10.0 g of$$ $$NaCl ($$molar mass $$= 58.44 g/$$mol) in enough water to make $$500 mL of $$solution?

Accepted Answer

$$0.342 M$$

Question 11

Which of the following is a property of gases explained by the kinetic molecular theory?

Accepted Answer

Gases expand to fill their containers because their particles move rapidly and are far apart.

Question 12

Which of the following is a Bronsted-Lowry acid?

Accepted Answer

$$H_2SO_4$$

Question 13

What is the pH of a solution with $$[H_3O^+] = 1.0 	imes 10$$^{-4}$$ M?

Accepted Answer

$$4.00$$

Question 14

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which two aqueous solutions combine to form an insoluble solid.

Question 15

A $$250 mL $$sample of a $$0.200 M$$ $$NaOH$$ solution is diluted to $$1.00 L. $$What is the new concentration?

Accepted Answer

$$0.0500 M$$

Question 16

Which of the following is the correct formula for the relationship between pressure, force, and area?

Accepted Answer

$$P = \frac{F}{A}$$

Question 17

Which of the following compounds can form hydrogen bonds with water?

Accepted Answer

$$CH_3OH$$

Question 18

A $$1.00 L $$solution contains $$0.10$$ mol $$KCl. $$What is the concentration of $$K^+$$ ions in the solution?

Accepted Answer

$$0.10 M$$

Question 19

Which of the following best describes an electrolyte solution?

Accepted Answer

A solution that conducts electricity due to the presence of ions.

Question 20

Which of the following is the correct value and equation for the ion product constant of water ($$K_w) at$$ $$25^\circC$$?

Accepted Answer

$$K_w = [H_3O^+][OH^-] = 1.0 	imes 10$$^{-14}$$

Introductory Chemistry Exam Review Guidance (Modules 5–8)

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