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 $$\mathrm{F \u003e O \u003e N \u003e Cl}$$?

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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