Q: A sample of iron ore is dissolved in acid and titrated with 47.20 mL of 0.02240 M MnO4-. How many moles of MnO4- were added?

$$1.057 \times 10$$^{-3}$$\ \mathrm{mol}$$

Question 1

Which of the following best describes what happens when sodium chloride (NaCl) dissolves in water?

Accepted Answer

NaCl dissociates into Na+ and Cl- ions, which are surrounded by water molecules.

Question 2

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

Accepted Answer

NaCl (sodium chloride)

Question 3

A solution is prepared by dissolving 0.50 mol of K2SO4 in enough water to make 1.0 L of solution. What is the concentration of K+ ions in the solution?

Accepted Answer

$$1.0\ \mathrm{M}$$

Question 4

Which of the following is the correct net ionic equation for the reaction between aqueous solutions of AgNO3 and NaCl?

Accepted Answer

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

Question 5

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

Accepted Answer

$$\mathrm{PbSO}_4$$

Question 6

What is the oxidation number of sulfur in $$\mathrm{SO}_4$$^{2-}$$?

Accepted Answer

$$+6$$

Question 7

Which of the following reactions is a redox reaction?

Accepted Answer

$$2\mathrm{Na}(s) + \mathrm{Cl}_2(g) \rightarrow 2\mathrm{NaCl}(s)$$

Question 8

A student mixes 50.0 mL of 0.200 M HCl with 50.0 mL of 0.200 M NaOH. What is the net ionic equation for the reaction?

Accepted Answer

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

Question 9

How many grams of Na2SO4 (molar mass = 142 g/mol) are required to make 0.350 L of 0.500 M Na2SO4 solution?

Accepted Answer

$$24.9\ \mathrm{g}$$

Question 10

Which of the following statements about strong and weak electrolytes is correct?

Accepted Answer

Strong electrolytes dissociate completely in water, while weak electrolytes dissociate only partially.

Question 11

A 0.025 M solution of Ca(NO3)2 is prepared. What is the concentration of NO3- ions in the solution?

Accepted Answer

$$0.050\ \mathrm{M}$$

Question 12

Which of the following is a correct example of a precipitation reaction?

Accepted Answer

$$2\mathrm{KI}(aq) + \mathrm{Pb(NO}_3)_2(aq) \rightarrow 2\mathrm{KNO}_3(aq) + \mathrm{PbI}_2(s)$$

Question 13

Which of the following acids is NOT a strong acid?

Accepted Answer

CH3COOH

Question 14

A sample of iron ore is dissolved in acid and titrated with 47.20 mL of 0.02240 M MnO4-. How many moles of MnO4- were added?

Accepted Answer

$$1.057 	imes 10$$^{-3}$$\ \mathrm{mol}$$

Question 15

Which of the following best describes the role of a spectator ion in a chemical reaction?

Accepted Answer

It is unchanged on both sides of the complete ionic equation.

Question 16

Which of the following solutions will have the highest electrical conductivity?

Accepted Answer

0.1 M Ca(NO3)2

Question 17

Which of the following is the correct balanced molecular equation for the reaction between barium chloride and potassium sulfate?

Accepted Answer

$$\mathrm{BaCl}_2(aq) + \mathrm{K}_2\mathrm{SO}_4(aq) \rightarrow \mathrm{BaSO}_4(s) + 2\mathrm{KCl}(aq)$$

Question 18

Which of the following best explains why sucrose (C12H22O11) does not conduct electricity when dissolved in water?

Accepted Answer

Sucrose does not dissociate into ions in water.

Reactions in Aqueous Solution: Electrolytes, Precipitation, Acid-Base, and Redox Reactions

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