Q: Which of the following is the correct Arrhenius definition of a base?

A substance that increases the concentration of $$\text{OH}^-$$ ions in solution.

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

$$\text{Molarity} = \frac{\text{moles of solute}}{\text{volume of solution in liters}}$$

Q: Which of the following is the correct equation for the relationship between pH and $$[\text{H}_3\text{O}^+]$$?

$$\text{pH} = -\log [\text{H}_3\text{O}^+]$$

Q: Which of the following is true about STP (Standard Temperature and Pressure)?

STP is $$0^\circ\text{C}$$ and $$1\ \text{atm}.$$

Q: A 1.0 L container holds 0.2 mol of $$\text{CO}_2 at 273 K $$and 1 atm. Using the Ideal Gas Law $$PV = nRT$$, what is the value of $$R if$$ $$P = 1\ \text{atm}$$, $$V = 1.0\ \text{L}$$, $$n = 0.2$$, $$T = 273\ \text{K}$$?

$$0.183\ \text{L}\cdot\text{atm}/\text{mol}\cdot\text{K}$$

Question 1

Which of the following is NOT a statement of the Kinetic Molecular Theory of Gases?

Accepted Answer

Gas particles attract each other strongly at all times.

Question 2

A sample of gas is contained in a 2.0 L vessel at 1.5 atm. If the volume is decreased to 1.0 L at constant temperature, what will the new pressure be? (Use Boyle's Law: $$P_1V_1 = P_2V_2)$$

Accepted Answer

$$3.0\ 	ext{atm}$$

Question 3

Which of the following is the correct conversion from $$25^\circ	ext{C} to $$Kelvin?

Accepted Answer

$$298\ 	ext{K}$$

Question 4

A 0.50 M NaCl solution is diluted to a final volume of 250 mL. If the initial volume was 100 mL, what is the new molarity? (Use $$M_1V_1 = M_2V_2)$$

Accepted Answer

$$0.20\ 	ext{M}$$

Question 5

Which of the following is a colligative property?

Accepted Answer

Boiling point elevation

Question 6

A solution contains 10 g of NaCl dissolved in 90 g of water. What is the mass/mass percent of NaCl in the solution?

Accepted Answer

$$11.1\%$$

Question 7

Which of the following best describes a buffered solution?

Accepted Answer

A solution that resists changes in pH when small amounts of acid or base are added.

Question 8

Which of the following is the correct Arrhenius definition of a base?

Accepted Answer

A substance that increases the concentration of $$	ext{OH}^-$$ ions in solution.

Question 9

If the pH of a solution is 4.0, which statement is true?

Accepted Answer

The solution is acidic.

Question 10

A 1.0 L container holds 0.5 mol of $$	ext{O}_2$$ and 0.5 mol of $$	ext{N}_2 at 298 K. If $$the total pressure is 2.0 atm, what is the partial pressure of $$	ext{O}_2$$? (Use Law of Partial Pressures: $$P_{O_2$} = X_{O_2$} 	imes P_{	ext{total}})$$

Accepted Answer

$$1.0\ 	ext{atm}$$

Question 11

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

Accepted Answer

$$	ext{Molarity} = \frac{	ext{moles of solute}}{	ext{volume of solution in liters}}$$

Question 12

Which of the following is the correct equation for the relationship between pH and $$[	ext{H}_3	ext{O}^+]$$?

Accepted Answer

$$	ext{pH} = -\log [	ext{H}_3	ext{O}^+]$$

Question 13

In the reaction $$	ext{NH}_3 + 	ext{H}_2	ext{O} ightarrow 	ext{NH}_4^+ + 	ext{OH}^-$$, which species is the conjugate acid?

Accepted Answer

$$	ext{NH}_4^+$$

Question 14

A 0.1 M solution of HCl has a $$[	ext{H}_3	ext{O}^+] of$$ $$0.1\ 	ext{M}. $$What is the pH?

Accepted Answer

$$1.0$$

Question 15

Which of the following is true about STP (Standard Temperature and Pressure)?

Accepted Answer

STP is $$0^\circ	ext{C}$$ and $$1\ 	ext{atm}.$$

Question 16

A 250 mL solution contains 5 g of glucose ($$	ext{C}_6	ext{H}_{12}	ext{O}_6). $$What is the mass/volume percent of glucose?

Accepted Answer

$$2\%$$

Question 17

Which of the following is a property of acids?

Accepted Answer

Acids turn litmus paper red.

Question 18

A 0.01 M NaOH solution has a $$[	ext{OH}^-] of$$ $$0.01\ 	ext{M}. $$What is the pOH?

Accepted Answer

$$2.0$$

Question 19

A 1.0 L container holds 0.2 mol of $$	ext{CO}_2 at 273 K $$and 1 atm. Using the Ideal Gas Law $$PV = nRT$$, what is the value of $$R if$$ $$P = 1\ 	ext{atm}$$, $$V = 1.0\ 	ext{L}$$, $$n = 0.2$$, $$T = 273\ 	ext{K}$$?

Accepted Answer

$$0.183\ 	ext{L}\cdot	ext{atm}/	ext{mol}\cdot	ext{K}$$

Gases, Solutions, and Acid-Base Chemistry: Core Concepts and Calculations

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