Question 1

Which of the following statements best describes a strong electrolyte?

Accepted Answer

A substance that completely dissociates in water, producing ions that conduct electricity efficiently.

Question 2

Which of the following is a strong acid and therefore a strong electrolyte?

Accepted Answer

HNO3

Question 3

Which compound is a weak electrolyte when dissolved in water?

Accepted Answer

CH3COOH

Question 4

Which of the following is NOT a strong base?

Accepted Answer

NH3

Question 5

What is the oxidation number of oxygen in H2O2 (hydrogen peroxide)?

Accepted Answer

$-1$

Question 6

In the reaction $Zn(s) + Cu^{2+}(aq) \rightarrow Zn^{2+}(aq) + Cu(s)$, which species is oxidized?

Accepted Answer

Zn(s)

Question 7

Which of the following rules is correct for assigning oxidation numbers?

Accepted Answer

Halogens usually have an oxidation number of $-1$, unless bonded to a more electronegative element.

Question 8

A solution is prepared by dissolving $42.2$ g of NaCl in enough water to make $500.0$ mL of solution. What is the molarity of the solution? ($M_{NaCl} = 58.44$ g/mol)

Accepted Answer

$1.45$ M

Question 9

Which of the following is a non-electrolyte?

Accepted Answer

C2H5OH (ethanol)

Question 10

What is the oxidation number of chlorine in $NaClO_3$?

Accepted Answer

$+5$

Question 11

Which of the following solutions will conduct electricity the best?

Accepted Answer

A $0.1$ M solution of NaCl

Question 12

If $0.025$ mol of HCl is dissolved in $0.500$ L of water, what is the molarity of the solution?

Accepted Answer

$0.050$ M

Question 13

Which of the following is a weak acid?

Accepted Answer

CH3COOH

Question 14

A student needs to prepare $250.0$ mL of $0.200$ M NaOH solution. How many grams of NaOH are required? ($M_{NaOH} = 40.00$ g/mol)

Accepted Answer

$2.00$ g

Question 15

Which of the following is the correct oxidation half-reaction for the reaction $Zn(s) + Cu^{2+}(aq) \rightarrow Zn^{2+}(aq) + Cu(s)$?

Accepted Answer

$Zn(s) \rightarrow Zn^{2+}(aq) + 2e^-$

Question 16

Which of the following is true about weak electrolytes?

Accepted Answer

They partially dissociate in water, producing some ions.

Question 17

What is the oxidation number of sulfur in $H_2SO_4$?

Accepted Answer

$+6$

Question 18

Which of the following is a strong electrolyte but NOT an acid or base?

Accepted Answer

NaCl

Question 19

A solution is made by diluting $50.0$ mL of $2.0$ M HCl to a final volume of $200.0$ mL. What is the final concentration?

Accepted Answer

$0.50$ M

Question 20

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

Accepted Answer

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

Electrolytes and Oxidation Numbers in General Chemistry

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