Q: Which of the following is the correct formula for calculating the molarity ($$M) of a $$solution?

$$M = \frac{\text{moles of solute}}{\text{liters of solution}}$$

Question 1

Which of the following 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 water. How many moles of water are present in the sample?

Accepted Answer

$$0.500$$ moles

Question 3

Which of the following compounds will exhibit hydrogen bonding between its molecules?

Accepted Answer

CH$$_3OH$$

Question 4

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

Accepted Answer

$$75\%$$

Question 5

Which of the following is the correct balanced equation for the reaction of sodium sulfate with barium chloride to form barium sulfate and sodium chloride?

Accepted Answer

$$\mathrm{Na_2SO_4 (aq) + $$BaCl_2$$ (aq) \rightarrow $$BaSO_4$$ (s) + 2NaCl (aq)}$$

Question 6

Which of the following statements about gases is TRUE according to the kinetic molecular theory?

Accepted Answer

Gas particles are in constant, random motion and collisions between them are elastic.

Question 7

A $$2.00 L $$sample of gas at $$1.00$$ atm and $$300 K is $$compressed to $$1.00 L at $$constant temperature. What is the new pressure?

Accepted Answer

$$2.00$$ atm

Question 8

Which of the following is a strong electrolyte when dissolved in water?

Accepted Answer

NaCl

Question 9

Which intermolecular force is present in all molecular substances, regardless of their polarity?

Accepted Answer

Dispersion (London) forces

Question 10

A solution is prepared by dissolving $$10.0 g of $$NaCl in $$90.0 g of $$water. What is the mass percent of NaCl in the solution?

Accepted Answer

$$10\%$$

Question 11

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 12

What is the molarity of a solution prepared by dissolving $$0.50$$ moles of KBr in $$0.25 L of $$water?

Accepted Answer

$$2.0 M$$

Question 13

Which of the following is a property of acids according to the Arrhenius definition?

Accepted Answer

They increase the concentration of $$\mathrm{H^+}$$ ions in aqueous solution.

Question 14

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

Accepted Answer

$$4.00$$

Question 15

Which of the following best describes a redox reaction?

Accepted Answer

A reaction in which electrons are transferred from one species to another.

Question 16

Which of the following is the correct formula for calculating the molarity ($$M) of a $$solution?

Accepted Answer

$$M = \frac{	ext{moles of solute}}{	ext{liters of solution}}$$

Question 17

A $$0.10 M $$solution of HCl is considered a strong acid because:

Accepted Answer

It completely ionizes in water.

Question 18

Which of the following is the correct relationship for Boyle's Law?

Accepted Answer

$$P_1V_1 = P_2V_2$$

Question 19

Which of the following best explains why the solubility of most solid solutes in water increases with temperature?

Accepted Answer

Increased temperature provides more kinetic energy to break solute-solute interactions.

Question 20

A $$1.0 L $$solution contains $$0.10$$ mol of NaOH. What is the $$[\mathrm{OH^-}] in $$the solution?

Accepted Answer

$$0.10 M$$

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