Question 1

Which of the following best describes a solution?

Accepted Answer

A homogeneous mixture of two or more substances

Question 2

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

Accepted Answer

$$0.122\ \mathrm{M}$$

Question 3

Which of the following statements about electrolytes is correct?

Accepted Answer

Strong electrolytes dissociate completely into ions in solution

Question 4

How many liters of a $$0.0550\ \mathrm{M}$$ KCl solution contain $$0.163$$ moles of KCl?

Accepted Answer

$$2.96\ \mathrm{L}$$

Question 5

Which of the following compounds will produce a precipitate when mixed with a solution of $$\mathrm{Pb(NO_3$)_2}$$?

Accepted Answer

$$\mathrm{Na_2SO_4}$$

Question 6

What is the net ionic equation for the reaction between $$\mathrm{Na_2CO_3}$$ and $$\mathrm{HCl}$$?

Accepted Answer

$$\mathrm{CO_3$^{2-}(aq) + 2H^+(aq) \rightarrow CO_2$(g) + H_2O(l)}$$

Question 7

A student needs to prepare $$250.0\ \mathrm{mL} of a$$ $$0.135\ \mathrm{M}$$ $$\mathrm{$$AgNO_3$$}$$ solution. How many grams of $$\mathrm{$$AgNO_3$$} ($$molar mass = $$169.87\ \mathrm{g/mol}) $$are required?

Accepted Answer

$$5.74\ \mathrm{g}$$

Question 8

Which of the following best describes the process of dilution?

Accepted Answer

Adding more solvent to decrease the concentration

Question 9

What is the oxidation number of sulfur in $$\mathrm{H_2SO_4}$$?

Accepted Answer

$$+6$$

Question 10

Which of the following reactions is a redox reaction?

Accepted Answer

$$\mathrm{Zn(s) + 2HCl(aq) \rightarrow $$ZnCl_2$$(aq) + H_2$(g)}$$

Question 11

A $$10.0\ \mathrm{mL}$$ sample of $$0.20\ \mathrm{M}$$ HBr is titrated with $$0.10\ \mathrm{M}$$ NaOH. What volume of NaOH is required to reach the equivalence point?

Accepted Answer

$$20.0\ \mathrm{mL}$$

Question 12

Which of the following is a strong electrolyte?

Accepted Answer

Sodium chloride ($$\mathrm{NaCl})$$

Question 13

Which of the following best describes the role of a reducing agent in a redox reaction?

Accepted Answer

It loses electrons and is oxidized

Question 14

What is the net ionic equation for the neutralization reaction between $$\mathrm{HCl}$$ and $$\mathrm{NaOH}$$?

Accepted Answer

$$\mathrm{H^+(aq) + OH^-(aq) \rightarrow H_2O(l)}$$

Question 15

Which of the following best explains why ionic compounds like NaCl conduct electricity in water, but sugar does not?

Accepted Answer

NaCl forms ions in water, while sugar does not

Question 16

A solution is prepared by mixing $$85.0\ \mathrm{mL} of$$ $$0.175\ \mathrm{M}$$ potassium nitrate and $$105.0\ \mathrm{mL} of$$ $$0.215\ \mathrm{M}$$ magnesium nitrate. What is the molarity of nitrate ions, $$[\mathrm{NO_3$^-}]$$, in the combined solution? (Assume volumes are additive.)

Accepted Answer

$$0.197\ \mathrm{M}$$

Question 17

Which of the following is the correct balanced molecular equation for the reaction between $$\mathrm{Ba(NO_3$)_2}$$ and $$\mathrm{Na_2SO_4} in $$aqueous solution?

Accepted Answer

$$\mathrm{Ba(NO_3$)_2(aq) + Na_2SO_4(aq) \rightarrow $$BaSO_4$$(s) + 2NaNO_3(aq)}$$

Question 18

Which of the following is the correct formula for calculating the volume of stock solution needed to prepare a diluted solution?

Accepted Answer

$$V_{\mathrm{stock}} = \frac{M_{\mathrm{diluted}} 	imes V_{\mathrm{diluted}}}{M_{\mathrm{stock}}}$$

Solutions and Aqueous Reactions: Structure, Properties, and Calculations

Guida di studio - Domande di pratica

Study guide - Flashcard