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UCE (O-Level) Types of reactions — practice questions

Explore 6 free Types of reactions questions in UCE (O-Level) Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Types of reactions questions and exercises with answers

Showing questions 1–6 of 6.

In the Bronsted-Lowry model, what is an acid?Read the answer and worked solution →Water can react as an acid in one reaction and as a base in another. What word describes a substance like this?Read the answer and worked solution →In terms of electrons, what is oxidation?Read the answer and worked solution →In a redox reaction, an element is oxidised. What role does that element play?Read the answer and worked solution →An acid reacts with a base and a salt is formed. Which ions make up that salt?Read the answer and worked solution →Call each statement true or falseRead the answer and worked solution →

Worked practice questions

In the Bronsted-Lowry model, what is an acid?

  1. A proton acceptor
  2. A proton donor
  3. An electron donor
  4. An atom acceptor
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Correct answer: B. A proton donor

1. The Bronsted-Lowry model defines acids and bases by what they do with protons. 2. A Bronsted-Lowry acid is a substance that gives away protons, so it is a proton donor. 3. A Bronsted-Lowry base takes up protons instead, so it is a proton acceptor. 4. This definition works outside water as well, which the older Arrhenius definition could not do. _Source: Siyavula Physical Sciences Grade 11 (Everything Science, CC BY 4.0), Chapter 13: Types of reactions_

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Water can react as an acid in one reaction and as a base in another. What word describes a substance like this?

  1. Monoprotic
  2. Polyprotic
  3. Amphoteric
  4. Conjugate
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Correct answer: C. Amphoteric

1. In its reaction with ammonia, water donates a proton and behaves as an acid. 2. In its reaction with acetic acid, water accepts a proton and behaves as a base. 3. A substance that can react as either an acid or a base is described as amphoteric. 4. A polyprotic acid is one that has more than one proton to donate, which is a separate idea. _Source: Siyavula Physical Sciences Grade 11 (Everything Science, CC BY 4.0), Chapter 13: Types of reactions_

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In terms of electrons, what is oxidation?

  1. Gain of electrons
  2. Loss of neutrons
  3. Gain of protons
  4. Loss of electrons
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Correct answer: D. Loss of electrons

1. A redox reaction involves an exchange of electrons between two species. 2. Oxidation is the loss of electrons by a molecule, atom or ion. 3. Reduction is the gain of electrons, and the two always happen together. 4. The memory aid OiLRiG stands for oxidation is loss and reduction is gain. _Source: Siyavula Physical Sciences Grade 11 (Everything Science, CC BY 4.0), Chapter 13: Types of reactions_

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