Question 1

Which of the following best describes a Lewis acid?

Accepted Answer

A substance that accepts an electron pair

Question 2

In the reaction $$\mathrm{BF_3$ + NH_3$ \rightarrow F_3B-NH_3$}$$, which species acts as the Lewis base?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 3

Which of the following is NOT necessarily classified as a Lewis acid?

Accepted Answer

A molecule that donates an electron pair

Question 4

Which of the following statements is TRUE regarding the relationship between Lewis and Brønsted-Lowry acid-base theories?

Accepted Answer

All Brønsted-Lowry acids are Lewis acids, but not all Lewis acids are Brønsted-Lowry acids.

Question 5

Consider the reaction: $$\mathrm{CO_2$ (g) + CaO (s) \rightarrow $$CaCO_3$$ (s)}. $$Which species is the Lewis acid?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 6

Which of the following is an example of a Lewis acid-base reaction that is NOT a Brønsted-Lowry acid-base reaction?

Accepted Answer

$$\mathrm{BF_3$ + F^- \rightarrow BF_4$^-}$$

Question 7

Which of the following best explains why $$\mathrm{$$AlCl_3$$}$$ acts as a Lewis acid in chemical reactions?

Accepted Answer

It can accept an electron pair due to an incomplete octet.

Question 8

Identify the Lewis base in the following reaction: $$\mathrm{CH_3COO^- + H^+ \rightarrow CH_3COOH}.$$

Accepted Answer

$$\mathrm{CH_3COO^-}$$

Question 9

Which of the following is a correct definition of a Lewis base?

Accepted Answer

A substance that donates an electron pair

Question 10

Which of the following species can act as both a Lewis acid and a Brønsted-Lowry acid?

Accepted Answer

$$\mathrm{H^+}$$

Question 11

In the reaction $$\mathrm{CH_3COOH + OH^- \rightarrow CH_3COO^- + H_2O}$$, which species is the Lewis acid?

Accepted Answer

$$\mathrm{CH_3COOH}$$

Question 12

Which of the following is a real-world application of Lewis acid-base chemistry?

Accepted Answer

Formation of $$\mathrm{$$CaCO_3$$} in $$antacid tablets neutralizing stomach acid

Question 13

Which of the following is the product of the reaction between $$\mathrm{CO_2$}$$ and $$\mathrm{CaO}$$, considering Lewis acid-base theory?

Accepted Answer

$$\mathrm{$$CaCO_3$$}$$

Question 14

Which of the following is a characteristic of a Lewis acid but NOT necessarily of a Brønsted-Lowry acid?

Accepted Answer

Ability to accept an electron pair

Question 15

Which of the following best describes why $$\mathrm{NH_3$} is $$considered a Lewis base?

Accepted Answer

It donates an electron pair from its lone pair of electrons.

Lewis Acids and Bases: Concepts and Applications

Study Guide - Practice Questions