CHAPTER 2- ACIDS AND BASES
Questions And Answers 2023-2024
According to the Bronsted-Lowry definition, a base is a proton _____, while an acid is a
... [Show More] proton _____. -
Correct Answer-acceptor; donor
According to the Bronsted-Lowry definition, an acid must contain which of the following? - Correct AnswerA hydrogen atom
A Bronsted-Lowry base must have an "available" electron pair to form a bond to H+. Which of the following
structural features allow an electron pair to be used in this way? - Correct Answer-- One or more electron
pairs in π bonds.
- One or more lone pairs in the structure.
Which of the following Bronsted-Lowry acid/base classifications are correct? - Correct Answer-- (CH3)3N is
a base.
- CH3COOH is an acid.
Select all statements that accurately describe Bronsted-Lowry acid-base reactions. - Correct Answer--
Acid-base reactions are also known as proton transfer reactions.
- One bond is formed in an acid-base reaction.
Match each term with the correct Bronsted-Lowry definition.
- Acid:
- Base: - Correct Answer-- proton (H+) donor
- proton (H+) acceptor
When identifying Bronsted-Lowry acids and bases in an organic reaction, if only one species has a lone
pair or π bond it must be the _____, while if only one species contains an available hydrogen atom it must
be the _____. - Correct Answer-base, acid
*Reason: A species with a lone pair can readily accept a proton and is therefore defined as a base.
Which of the following statements correctly describe Bronsted-Lowry acids? - Correct Answer-- A BronstedLowry acid must contain a H atom.
- A Bronsted-Lowry acid is a proton donor.
Which of the statements below correctly describe the curved arrows required to show the mechanism of the
following acid-base reaction correctly? - Correct Answer-- An arrow must begin on the lone pair of the
acetylide and end on a hydrogen of H2O.
- An arrow must begin on one of the bonds between H and O and end on O.
Which of the following structural characteristics is required for a compound to act as a Bronsted-Lowry
base? - Correct Answer-An available electron pair
Select all species in the diagram that can function as Bronsted-Lowry bases. - Correct Answer-- B
- C
- D
*Reason: the base must contain an "available" electron pair that can be easily donated to form a new bond.
A Bronsted-Lowry acid donates a proton to form its conjugate _____, whereas a Bronsted-Lowry base
accepts a proton to form its conjugate _____. - Correct Answer-base; acid
Which of the following statements correctly describe the steps involved in any general reaction between a
Bronsted-Lowry acid and base (see the diagram)? - Correct Answer-- The acid (H-A) loses a proton,
leaving an electron pair on atom A.
- The electron pair of the base (B:) forms a new bond to H.
Which of the following is the correct formula for the conjugate acid of CH3NH2? - Correct AnswerCH3NH3+
*Reason: The N atom should be positively charged when CH3NH2 gains an H+.
In many acid-base reactions a starting material with a net _____ charge is usually an acid while a starting
material with a net _____ charge is often a base. - Correct Answer-positive; negative
Acid-base reactions exemplify a general trend of reactivity. The base is an electron-_____ species that
reacts readily with the electron-_____ acid. - Correct Answer-rich, deficient
*Reason: The electron-rich base donates electrons to the acid, which is electron-deficient.
Which of the following Bronsted-Lowry acid-base reactions is drawn correctly? - Correct Answer-C
A Bronsted-Lowry base must have an "available" electron pair to form a bond to H+. Which of the following
structural features allow an electron pair to be used in this way? - Correct Answer-- One or more electron
pairs in π bonds.
- One or more lone pairs in the structure.
Acid strength is a measure of how readily a compound donates a(n) ______. - Correct Answer-proton
Match the appropriate acid-base process with the correct result.
- loss of a proton from an acid:
- gain of a proton by a base: - Correct Answer-- formation of its conjugate base
- formation of its conjugate acid
Match the type of acid with the appropriate Ka value.
- Strong acid:
- Weak acid: - Correct Answer-- Large value of Ka
- Small value of Ka
The compound CH3CH2OH (ethanol) can act as either an acid or a base. Match each structure given
according to its relationship to ethanol.
- CH3CH2O- : ... [Show Less]