Question 1

According to the Brønsted-Lowry definition, which of the following best describes a base?

Accepted Answer

A substance that accepts a proton ($H^+$)

Question 2

Which of the following pairs are always found together in a Brønsted-Lowry acid/base reaction?

Accepted Answer

Conjugate acid and conjugate base

Question 3

In the reaction $HF	ext{ (aq)} + H_2O	ext{ (l)} \rightarrow F^-	ext{ (aq)} + H_3O^+	ext{ (aq)}$, which species acts as the Brønsted-Lowry acid?

Accepted Answer

$HF$

Question 4

What is the conjugate base of $HSO_4^-$?

Accepted Answer

$SO_4^{2-}$

Question 5

Which of the following is a Brønsted-Lowry acid?

Accepted Answer

$HCN$

Question 6

In the reaction $CN^-	ext{ (aq)} + H_2O	ext{ (l)} \rightarrow HCN	ext{ (aq)} + OH^-	ext{ (aq)}$, what is the conjugate acid?

Accepted Answer

$HCN$

Question 7

Which of the following statements is TRUE about Brønsted-Lowry acids and bases?

Accepted Answer

They always form conjugate acid/base pairs in reactions.

Question 8

What is the conjugate acid of $NH_2NH_2$?

Accepted Answer

$NH_2NH_3^+$

Question 9

Which of the following best describes the role of $H_2O$ in the reaction $CO_3^{2-}	ext{ (aq)} + H_2O	ext{ (l)} \rightarrow HCO_3^-	ext{ (aq)} + OH^-	ext{ (aq)}$?

Accepted Answer

It acts as a Brønsted-Lowry acid.

Question 10

If $H_2SO_4$ donates a proton, what is the resulting conjugate base?

Accepted Answer

$HSO_4^-$

Question 11

Which of the following reactions demonstrates the Brønsted-Lowry concept of acid-base pairs?

Accepted Answer

$NH_3 + H_2O \rightarrow NH_4^+ + OH^-$

Question 12

In the reaction $HS^-	ext{ (aq)} \rightarrow S^{2-}	ext{ (aq)} + H^+$, what is $S^{2-}$ in relation to $HS^-$?

Accepted Answer

Conjugate base

Question 13

Which of the following is the correct chemical equation for the reaction of carbonate ion with water?

Accepted Answer

$CO_3^{2-}	ext{ (aq)} + H_2O	ext{ (l)} \rightarrow HCO_3^-	ext{ (aq)} + OH^-	ext{ (aq)}$

Question 14

Which of the following is the conjugate acid of $VO_2^-$?

Accepted Answer

$HVO_2$

Question 15

In the reaction $HCN	ext{ (aq)} + OH^-	ext{ (aq)} \rightarrow CN^-	ext{ (aq)} + H_2O	ext{ (l)}$, which species is the conjugate base?

Accepted Answer

$CN^-$

Question 16

Which of the following is NOT a characteristic of Brønsted-Lowry acids?

Accepted Answer

They must contain oxygen

Question 17

A student mixes $NH_3$ and $H_2O$ in a beaker. Which species acts as the Brønsted-Lowry base?

Accepted Answer

$NH_3$

Question 18

Which of the following best explains why $SO_4^{2-}$ is the conjugate base of $HSO_4^-$?

Accepted Answer

It is formed by removing a proton ($H^+$) from $HSO_4^-$

Question 19

Which of the following is the correct definition of a conjugate acid?

Accepted Answer

A species formed when a base gains a proton ($H^+$)

Bronsted-Lowry Acids and Bases: Definitions, Conjugate Pairs, and Applications

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