Acid-Base Theories
Chemistry ⇒ Acids, Bases, and Salts
Acid-Base Theories starts at 9 and continues till grade 12.
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See sample questions for grade 11
Define a conjugate base.
Describe the main difference between the Arrhenius and Brønsted-Lowry definitions of acids and bases.
Describe the role of electron pairs in the Lewis acid-base theory.
Explain why NH3 is considered a base according to both Brønsted-Lowry and Lewis theories.
Explain why water is considered amphoteric.
Identify the Lewis acid in the following reaction: BF3 + NH3 → F3B←NH3
In the reaction: HSO4- + H2O ⇌ SO42- + H3O+, identify the conjugate acid of HSO4-.
In the reaction: NH3 + H2O ⇌ NH4+ + OH-, identify the Brønsted-Lowry acid.
Which of the following best describes an Arrhenius acid?
(1) A substance that increases the concentration of H+ ions in aqueous solution
(2) A substance that increases the concentration of OH- ions in aqueous solution
(3) A substance that donates a proton
(4) A substance that accepts a proton
Which of the following is a correct example of a Lewis acid-base reaction?
(1) HCl + NaOH → NaCl + H2O
(2) BF3 + NH3 → F3B←NH3
(3) H2SO4 + H2O → H3O+ + HSO4-
(4) NaOH + H2O → Na+ + OH-
Which of the following is a correct statement about conjugate acid-base pairs?
(1) They differ by one electron
(2) They differ by one proton
(3) They differ by one neutron
(4) They differ by one oxygen atom
Which of the following is a Lewis acid but not a Brønsted-Lowry acid?
(1) HCl
(2) BF3
(3) NH3
(4) H2O
According to the Brønsted-Lowry theory, a base is defined as a substance that ________ a proton.
Fill in the blank: A substance that can act as both an acid and a base is called ________.
Fill in the blank: According to Lewis theory, an acid is an electron pair ________.
Fill in the blank: In the reaction between HCl and NH3, HCl acts as a Brønsted-Lowry ________.
True or False: According to the Brønsted-Lowry theory, water can act as both an acid and a base.
True or False: All Arrhenius acids are also Brønsted-Lowry acids.
True or False: All Lewis acids contain hydrogen.
True or False: In the Lewis theory, a base must contain a lone pair of electrons.
