Q: A student needs to prepare 250 mL of a 0.10 M NaCl solution from a 1.0 M NaCl stock solution. What volume of the stock solution should be used?

$$V_1$$ = \frac{M_2V_2}{$$M_1$$} = \frac{0.10 \times 0.250}{1.0} = 0.025\ \text{L} = 25\ \text{mL}$$

Q: What is the molarity of a solution prepared by dissolving 5.85 g of NaCl (molar mass = 58.5 g/mol) in enough water to make 500 mL of solution?

$$M = \frac{\text{moles}}{\text{volume (L)}} = \frac{0.100}{0.500} = 0.20\ \text{M}$$

Q: Which of the following is a correct net ionic equation for the reaction between aqueous solutions of Na$$_2SO$_4$$ and BaCl$$_2$$?

$$\text{Ba}^{2+}(aq) + \text{SO}_4$$^{2-}$$(aq) \rightarrow \text{BaSO}_4(s)$$

Q: A 20.0 mL sample of 0.150 M HCl is titrated with 0.100 M NaOH. What volume of NaOH is required to reach the equivalence point?

$$M_1V_1 = M_2V_2 \rightarrow (0.150)(20.0) = (0.100)V_2$ \rightarrow V_2$ = 30.0\ \text{mL}$$

Q: Which of the following is the correct balanced molecular equation for the reaction between H$$_2SO$_4$$ and KOH?

$$\text{H}_2\text{SO}_4(aq) + 2\text{KOH}(aq) \rightarrow 2\text{H}_2\text{O}(l) + \text{K}_2\text{SO}_4(aq)$$

Q: A 0.200 M NaCl solution contains how many moles of Cl$$^- in 250 mL$$?

$$0.200\ \text{mol/L} \times 0.250\ \text{L} = 0.0500\ \text{mol}$$

Question 1

Which of the following best describes a solution in chemistry?

Accepted Answer

A homogeneous mixture of two or more substances where the solute is evenly distributed in the solvent.

Question 2

A student needs to prepare 250 mL of a 0.10 M NaCl solution from a 1.0 M NaCl stock solution. What volume of the stock solution should be used?

Accepted Answer

$$V_1$$ = \frac{M_2V_2}{$$M_1$$} = \frac{0.10 	imes 0.250}{1.0} = 0.025\ 	ext{L} = 25\ 	ext{mL}$$

Question 3

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

Accepted Answer

NaCl

Question 4

What is the molarity of a solution prepared by dissolving 5.85 g of NaCl (molar mass = 58.5 g/mol) in enough water to make 500 mL of solution?

Accepted Answer

$$M = \frac{	ext{moles}}{	ext{volume (L)}} = \frac{0.100}{0.500} = 0.20\ 	ext{M}$$

Question 5

Which of the following is a correct net ionic equation for the reaction between aqueous solutions of Na$$_2SO$_4$$ and BaCl$$_2$$?

Accepted Answer

$$	ext{Ba}^{2+}(aq) + 	ext{SO}_4$$^{2-}$$(aq) ightarrow 	ext{BaSO}_4(s)$$

Question 6

A 20.0 mL sample of 0.150 M HCl is titrated with 0.100 M NaOH. What volume of NaOH is required to reach the equivalence point?

Accepted Answer

$$M_1V_1 = M_2V_2 ightarrow (0.150)(20.0) = (0.100)V_2$ ightarrow V_2$ = 30.0\ 	ext{mL}$$

Question 7

Which of the following is a strong acid?

Accepted Answer

HNO$$_3$$

Question 8

In the reaction: $$2	ext{Al}(s) + 3	ext{CuCl}_2(aq) ightarrow 2	ext{AlCl}_3(aq) + 3	ext{Cu}(s)$$, what is the oxidation state change for aluminum?

Accepted Answer

Al goes from 0 to +3 (oxidation)

Question 9

Which of the following statements about electrolytes is correct?

Accepted Answer

Strong electrolytes completely dissociate into ions in water and conduct electricity well.

Question 10

A solution is prepared by mixing 50.0 mL of 0.10 M K$$_2SO$_4$$ with 35.0 mL of 0.114 M Pb(CH$$_3$$COO)$$_2. $$What is the limiting reactant in the precipitation reaction?

Accepted Answer

Pb(CH$$_3$$COO)$$_2$$

Question 11

Which of the following is the correct balanced molecular equation for the reaction between H$$_2SO$_4$$ and KOH?

Accepted Answer

$$	ext{H}_2	ext{SO}_4(aq) + 2	ext{KOH}(aq) ightarrow 2	ext{H}_2	ext{O}(l) + 	ext{K}_2	ext{SO}_4(aq)$$

Question 12

Which of the following is a correct statement about nonelectrolytes?

Accepted Answer

They do not dissociate into ions in water and do not conduct electricity.

Question 13

A 0.200 M NaCl solution contains how many moles of Cl$$^- in 250 mL$$?

Accepted Answer

$$0.200\ 	ext{mol/L} 	imes 0.250\ 	ext{L} = 0.0500\ 	ext{mol}$$

Question 14

Which of the following is the correct net ionic equation for the neutralization of HCl with NaOH?

Accepted Answer

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

Question 15

Which of the following is a weak acid?

Accepted Answer

CH$$_3$$COOH

Question 16

In the redox reaction $$	ext{Ag}^+(aq) + 	ext{Al}(s) ightarrow 	ext{Al}^{3+}(aq) + 	ext{Ag}(s)$$, which species is reduced?

Accepted Answer

Ag$$^+$$

Question 17

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which two soluble solutions are mixed and form an insoluble solid.

Question 18

Which of the following is a strong base?

Accepted Answer

KOH

Question 19

A 0.150 M AlCl$$_3$$ solution contains how many moles of Cl$$^-$$ per liter?

Accepted Answer

$$0.150\ 	ext{mol/L} 	imes 3 = 0.450\ 	ext{mol/L}$$

Question 20

Which of the following is the correct oxidation state for sulfur in SO$$_4$$^{2-}$$?

Accepted Answer

+6

Chapter 5

Guida di studio - Domande di pratica

Study guide - Flashcard