Q: Which of the following is the correct formula for calculating the molarity of a solution?

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

Question 1

Which of the following best describes a double replacement (metathesis) reaction?

Accepted Answer

A reaction in which two compounds exchange ions to form two new compounds.

Question 2

Given the balanced equation: $$2AlCl_3(aq) + 3Na_2CO_3(aq) \rightarrow Al_2$(CO_3$)_3(s) + 6NaCl(aq)$$, how many moles of $$NaCl$$ are produced when 0.436 moles of $$AlCl_3$$ react completely?

Accepted Answer

$$1.31$$ moles

Question 3

Which of the following is a Brønsted-Lowry acid?

Accepted Answer

$$NH_4$$^+$$

Question 4

Which of the following is the conjugate acid of $$NH_3$$?

Accepted Answer

$$NH_4$$^+$$

Question 5

A student dilutes 25.0 mL of 6.00 M $$H_2SO_4 to a $$final volume of 150.0 mL. What is the final molarity of the solution?

Accepted Answer

$$1.00 M$$

Question 6

Which equation correctly relates the pressure, volume, and temperature of an ideal gas?

Accepted Answer

$$PV = nRT$$

Question 7

If the $$[H^+] in a $$solution is $$1.5 	imes 10$$^{-5}$$ M, what is the pH of the solution?

Accepted Answer

$$4.82$$

Question 8

A 0.32 g sample of magnesium reacts with excess $$HCl to $$produce hydrogen gas. What volume of $$H_2$$ gas (at 20°C and 1.2 atm) is produced? (Molar mass of Mg = 24.3 g/mol, $$R = 0.0821 L$$·atm/mol·K)

Accepted Answer

$$0.081 L$$

Question 9

Which of the following best describes the process of balancing a chemical equation?

Accepted Answer

Adjusting the coefficients of reactants and products so that the number of atoms of each element is the same on both sides of the equation.

Question 10

A solution is prepared by dissolving 3.2 g of glucose ($$C_6H_{12}O_6$, molar mass = 180 g/mol) in enough water to make 250 mL of solution. What is the molarity of the solution?

Accepted Answer

$$0.071 M$$

Question 11

Which of the following is the correct net ionic equation for the reaction between $$AgNO_3(aq$$)$$ and $$NaCl(aq)$$?

Accepted Answer

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

Question 12

A sample of an ideal gas has a volume of 25.0 mL at 19°C and 1.55 atm. How many moles of gas are present in the sample? ($$R = 0.0821 L$$·atm/mol·K)

Accepted Answer

$$1.6 	imes 10$$^{-3}$$ mol

Question 13

Which of the following statements about the gas constant $$R is $$correct?

Accepted Answer

$$R$$ has a value of $$0.0821 L$$·atm/mol·K and is used in the ideal gas law.

Question 14

Which of the following is a correct application of the combined gas law?

Accepted Answer

$$\frac{P_1V_1}{T_1$} = \frac{P_2V_2}{T_2$}$$

Question 15

A 12.0 mL sample of a 5.5 M glucose solution is diluted to a final volume of 100.0 mL. What is the final concentration?

Accepted Answer

$$0.66 M$$

Question 16

Which of the following best describes the relationship between temperature and kinetic energy in gases?

Accepted Answer

As temperature increases, the average kinetic energy of gas molecules increases.

Question 17

Which of the following is the correct formula for calculating the molarity of a solution?

Accepted Answer

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

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