Q: What is the molarity of a solution prepared by dissolving 25.5 g of KBr (molar mass = 119.0 g/mol) in 1.75 L of water?

$$\frac{25.5}{119.0 \times 1.75} = 0.122\ \text{M}$$

Q: A student needs to prepare 200.0 mL of 0.25 M NaCl solution from a 2.0 M stock solution. What volume of the stock solution should be used?

$$V_1$$ = \frac{$$M_2$$ $$V_2$$}{$$M_1$$} = \frac{0.25 \times 200.0}{2.0} = 25\ \text{mL}$$

Q: What is the net ionic equation for the reaction between Na2CO3(aq) and 2 HCl(aq)?

$$\text{CO}_3$$^{2-}$$(aq) + 2\text{H}^+(aq) \rightarrow \text{CO}_2(g) + \text{H}_2\text{O}(l)$$

Q: Which of the following equations represents the dissociation of CaCl2 in water?

$$\text{CaCl}_2(aq) \rightarrow \text{Ca}^{2+}(aq) + 2\text{Cl}^-(aq)$$

Q: What is the molarity of a solution containing 3.4 g of NH3 (molar mass = 17.03 g/mol) in 200.0 mL of solution?

$$\frac{3.4}{17.03 \times 0.2000} = 1.0\ \text{M}$$

Q: Which of the following is the correct net ionic equation for the reaction between HCl(aq) and NaOH(aq)?

$$\text{H}^+(aq) + \text{OH}^-(aq) \rightarrow \text{H}_2\text{O}(l)$$

Q: A titration of 10.00 mL of HCl solution requires 12.54 mL of 0.100 M NaOH to reach the endpoint. What is the concentration of the HCl solution?

$$C_{HCl} = \frac{C_{NaOH} \times V_{NaOH}}{V_{HCl}} = \frac{0.100 \times 12.54}{10.00} = 0.125\ \text{M}$$

Q: Which of the following reactions is a gas-evolving reaction?

$$\text{NaHCO}_3(aq) + \text{HC}_2\text{H}_3\text{O}_2(aq) \rightarrow \text{NaC}_2\text{H}_3\text{O}_2(aq) + \text{CO}_2(g) + \text{H}_2\text{O}(l)$$

Question 1

Which of the following best describes a concentrated solution?

Accepted Answer

A solution with a large amount of solute compared to solvent.

Question 2

What is the molarity of a solution prepared by dissolving 25.5 g of KBr (molar mass = 119.0 g/mol) in 1.75 L of water?

Accepted Answer

$$\frac{25.5}{119.0 	imes 1.75} = 0.122\ 	ext{M}$$

Question 3

A student needs to prepare 200.0 mL of 0.25 M NaCl solution from a 2.0 M stock solution. What volume of the stock solution should be used?

Accepted Answer

$$V_1$$ = \frac{$$M_2$$ $$V_2$$}{$$M_1$$} = \frac{0.25 	imes 200.0}{2.0} = 25\ 	ext{mL}$$

Question 4

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

Accepted Answer

AgCl

Question 5

What is the net ionic equation for the reaction between Na2CO3(aq) and 2 HCl(aq)?

Accepted Answer

$$	ext{CO}_3$$^{2-}$$(aq) + 2	ext{H}^+(aq) ightarrow 	ext{CO}_2(g) + 	ext{H}_2	ext{O}(l)$$

Question 6

Which of the following is a strong electrolyte?

Accepted Answer

NaCl

Question 7

A solution of AgNO3 is mixed with a solution of NaCl. What is the precipitate formed?

Accepted Answer

AgCl

Question 8

Which of the following equations represents the dissociation of CaCl2 in water?

Accepted Answer

$$	ext{CaCl}_2(aq) ightarrow 	ext{Ca}^{2+}(aq) + 2	ext{Cl}^-(aq)$$

Question 9

Which of the following best describes a nonelectrolyte?

Accepted Answer

A substance that does not produce ions in water.

Question 10

What is the molarity of a solution containing 3.4 g of NH3 (molar mass = 17.03 g/mol) in 200.0 mL of solution?

Accepted Answer

$$\frac{3.4}{17.03 	imes 0.2000} = 1.0\ 	ext{M}$$

Question 11

Which of the following is the correct net ionic equation for the reaction between HCl(aq) and NaOH(aq)?

Accepted Answer

$$	ext{H}^+(aq) + 	ext{OH}^-(aq) ightarrow 	ext{H}_2	ext{O}(l)$$

Question 12

Which of the following is a weak acid?

Accepted Answer

HC2H3O2

Question 13

A titration of 10.00 mL of HCl solution requires 12.54 mL of 0.100 M NaOH to reach the endpoint. What is the concentration of the HCl solution?

Accepted Answer

$$C_{HCl} = \frac{C_{NaOH} 	imes V_{NaOH}}{V_{HCl}} = \frac{0.100 	imes 12.54}{10.00} = 0.125\ 	ext{M}$$

Question 14

Which of the following reactions is a gas-evolving reaction?

Accepted Answer

$$	ext{NaHCO}_3(aq) + 	ext{HC}_2	ext{H}_3	ext{O}_2(aq) ightarrow 	ext{NaC}_2	ext{H}_3	ext{O}_2(aq) + 	ext{CO}_2(g) + 	ext{H}_2	ext{O}(l)$$

Question 15

Assign the oxidation state to sulfur in SO4$$^{2-}.$$

Accepted Answer

$$+6$$

Question 16

Which element is oxidized in the reaction: 2 Na(s) + Cl2(g) → 2 NaCl(s)?

Accepted Answer

Na

Question 17

Which of the following statements about oxidation and reduction is correct?

Accepted Answer

Oxidation is the loss of electrons.

Question 18

According to the activity series, which metal will spontaneously reduce Pb$$^{2+} to Pb(s$$)?

Accepted Answer

Fe

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