Lesson 12.1.1
12.1.1 Brønsted-Lowry acids, bases and conjugate pairs Quiz: Pearson Edexcel Chemistry, Unit 12
20 questions
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Lesson 12.1.1, Brønsted-Lowry acids, bases and conjugate pairs: 20 multiple choice questions for the Pearson Edexcel Chemistry (9CH0), Unit 12: Acid-base Equilibria, written with Revision Ninja.
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The 20 questions
-
According to Brønsted-Lowry theory, what is defined as an acid?
- Proton acceptor
- Electron donor
- Electron acceptor
- Proton donor
-
According to Brønsted-Lowry theory, what is defined as a base?
- Electron acceptor
- Proton acceptor
- Electron donor
- Proton donor
-
In the reaction HCl + H2O → H3O+ + Cl-, which species acts as the Brønsted-Lowry base?
- Cl-
- H3O+
- HCl
- H2O
-
In the reaction NH3 + H2O ⇌ NH4+ + OH-, which pair is a conjugate acid-base pair?
- NH3 and OH-
- H2O and NH4+
- NH3 and H2O
- NH4+ and NH3
-
What is the conjugate base of HNO3?
- NO3-
- H2NO3+
- NO2
- HNO3-
-
What is the conjugate acid of H2O when water acts as a base?
- O2-
- OH-
- H3O+
- H2
-
What is transferred from a Brønsted-Lowry acid to a Brønsted-Lowry base?
- A hydride ion
- A hydroxide ion
- A proton
- An electron
-
What is the conjugate acid of HCO3- in the equilibrium HCO3- + H2O ⇌ H2CO3 + OH-?
- H2CO3
- H2O
- OH-
- CO32-
-
What is the definition of pH?
- pH = log10[H+(aq)]
- pH = 1 / [H+]
- pH = [H+] x 10
- pH = -log10[H+(aq)]
-
A solution has [H+] = 1.0 x 10^-3 mol dm-3. What is its pH?
- 11
- -3
- 3
- 0.001
-
How does a strong acid behave in aqueous solution compared to a weak acid?
- Partially dissociates
- Forms basic ions
- Completely dissociates
- Does not ionise
-
Which species acts as both a Bronsted-Lowry acid and a base in water?
- H2O
- Na+
- NO3-
- Cl-
-
In the reaction CH3COOH + H2O ⇌ CH3COO- + H3O+, which species is a conjugate base?
- CH3COOH
- H3O+
- CH3COO-
- H2O
-
In what types of solvents can Brønsted-Lowry acid-base reactions occur?
- Pure water only
- Aqueous and non-aqueous
- Hydrocarbon solvents only
- Aqueous solvents only
-
What is the pH of a solution in which [H+] = 2.5 x 10^-2 mol dm-3? (log10 2.5 = 0.40)
- 2.40
- 12.40
- 0.40
- 1.60
-
What term describes a species that can act as both a proton donor and acceptor?
- Aprotic
- Anamorphic
- Amphiphilic
- Amphiprotic
-
In the reaction NH4+ + OH- → NH3 + H2O, which species acts as the Brønsted-Lowry acid?
- NH4+
- H2O
- NH3
- OH-
-
What is the pH of a solution with [H+] = 1.0 x 10^-7 mol dm-3 at 298 K?
- 14
- 7
- 0
- 1
-
By how many protons do the formulae of a conjugate acid-base pair differ?
- One proton
- Two protons
- Zero protons
- Three protons
-
Which species is the conjugate acid of the carbonate ion, CO3 2-?
- HCO3-
- CO2
- OH-
- H2CO3 only
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