Question 1

Which of the following best describes a strong acid in aqueous solution?

Accepted Answer

It completely ionizes, producing only $\mathrm{H^+}$ ions and the conjugate base.

Question 2

What is the net ionic equation for the reaction between hydrochloric acid ($\mathrm{HCl}$) and sodium hydroxide ($\mathrm{NaOH}$) in aqueous solution?

Accepted Answer

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

Question 3

During an acid-base titration, 25.0 mL of 0.500 M $\mathrm{NaOH}$ is required to react with an aspirin tablet containing $\mathrm{HC_9H_7O_4}$. What is the number of moles of $\mathrm{NaOH}$ used?

Accepted Answer

$0.0125~\mathrm{mol}$

Question 4

Which of the following is TRUE regarding the definition of oxidation in a redox reaction?

Accepted Answer

Oxidation is the loss of electrons by an atom or ion.

Question 5

Assign the oxidation state to nitrogen in $\mathrm{NH_4^+}$.

Accepted Answer

$-3$

Question 6

Which element has the highest electronegativity according to the order $\mathrm{F > O > N > Cl}$?

Accepted Answer

Fluorine

Question 7

Balance the following redox reaction in acidic medium: $\mathrm{Cl^- + MnO_4^- \rightarrow Cl_2 + Mn^{2+}}$. What is the coefficient for $\mathrm{H_2O}$ on the product side?

Accepted Answer

5

Question 8

In a titration, what is the purpose of the indicator?

Accepted Answer

To change color at the equivalence point, signaling completion of the reaction.

Question 9

Which of the following is the correct net ionic equation for the reaction between $\mathrm{NaOH}$ and $\mathrm{HC_2H_3O_2}$ (acetic acid)?

Accepted Answer

$\mathrm{OH^-~(aq) + HC_2H_3O_2~(aq) \rightarrow C_2H_3O_2^-~(aq) + H_2O~(l)}$

Question 10

A product must contain at least 5% acetic acid ($\mathrm{HC_2H_3O_2}$) by mass to be called 'vinegar.' If a 100.0 g sample contains 6.0 g of acetic acid, does it qualify as vinegar?

Accepted Answer

Yes, because it contains more than 5% acetic acid.

Question 11

What is the oxidation state of chromium in $\mathrm{Cr_2O_7^{2-}}$?

Accepted Answer

$+6$

Question 12

Which of the following statements about balancing redox reactions is correct?

Accepted Answer

Redox reactions require the use of the half-reaction method, especially in acidic or basic medium.

Question 13

In the reaction $\mathrm{MnO_4^- + Fe^{2+} \rightarrow Mn^{2+} + Fe^{3+}}$, which species is oxidized?

Accepted Answer

$\mathrm{Fe^{2+}}$

Question 14

If 27.5 mL of 0.250 M $\mathrm{Fe(NO_3)_2}$ is completely reacted with $\mathrm{KMnO_4}$, how many moles of $\mathrm{Fe^{2+}}$ are present?

Accepted Answer

$0.00688~\mathrm{mol}$

Question 15

Which of the following is the correct balanced half-reaction for the reduction of $\mathrm{MnO_4^-}$ to $\mathrm{Mn^{2+}}$ in acidic medium?

Accepted Answer

$\mathrm{MnO_4^-~(aq) + 8H^+~(aq) + 5e^- \rightarrow Mn^{2+}~(aq) + 4H_2O~(l)}$

Question 16

Which of the following is a correct statement about weak acids?

Accepted Answer

They partially ionize in water, producing both $\mathrm{H^+}$ ions and intact acid molecules.

Question 17

In the half-reaction method for balancing redox reactions in basic medium, what is the additional step compared to acidic medium?

Accepted Answer

Add $\mathrm{OH^-}$ to both sides to neutralize $\mathrm{H^+}$.

Question 18

Which of the following is the correct oxidation state for sulfur in $\mathrm{SO_4^{2-}}$?

Accepted Answer

$+6$

Question 19

Which of the following is a real-world application of redox reactions?

Accepted Answer

Corrosion of iron in the presence of water and oxygen.

Acid-Base and Oxidation-Reduction Reactions: Study Notes for General Chemistry

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