What is the definition of a Bronsted-Lowry acid?
R3.1 - Proton Transfer Reactions

Quiz
•
Biology
•
9th - 12th Grade
•
Easy
John Mazo
Used 3+ times
FREE Resource
16 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A substance that accepts a proton
A substance that donates a proton
A substance that donates electrons
A substance that accepts electrons
Answer explanation
A Bronsted-Lowry acid is defined as a substance that donates a proton (H+). This distinguishes it from bases, which accept protons. Therefore, the correct answer is 'A substance that donates a proton'.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the conjugate base of HCl?
Cl⁻
H₂O
OH⁻
H₃O⁺
Answer explanation
The conjugate base of an acid is what remains after the acid donates a proton. HCl donates a proton (H⁺) to become Cl⁻, making Cl⁻ the correct conjugate base.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the reaction between ammonia (NH₃) and water, which species acts as the Bronsted-Lowry base?
NH₃
H₂O
NH₄⁺
OH⁻
Answer explanation
In the reaction between NH₃ and water, NH₃ accepts a proton (H⁺) from water, making it the Bronsted-Lowry base. Water acts as the acid by donating the proton, while NH₄⁺ and OH⁻ are products of the reaction.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following substances is amphoteric?
NaOH
H₂SO₄
HCl
H₂O
Answer explanation
H₂O is amphoteric because it can act as both an acid and a base. It can donate a proton (H⁺) to form OH⁻ or accept a proton to form H₃O⁺, unlike NaOH, H₂SO₄, and HCl, which are strictly bases or acids.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the conjugate acid of NH₃?
NH₄⁺
OH⁻
H₃O⁺
H₂O
Answer explanation
The conjugate acid of a base is formed when the base accepts a proton (H⁺). NH₃ (ammonia) accepts a proton to become NH₄⁺ (ammonium), making NH₄⁺ the correct answer.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is a strong acid?
CH₃COOH
H₂CO₃
HCl
H₂O
Answer explanation
HCl (hydrochloric acid) is a strong acid that completely dissociates in water, making it highly effective in increasing hydrogen ion concentration. In contrast, CH₃COOH (acetic acid) and H₂CO₃ (carbonic acid) are weak acids.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is a weak base?
NaOH
NH₃
KOH
H₂SO₄
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