Chemical Reactions and Equations: Identifying Oxidised and Reduced Substances
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Questions and Answers

What type of reaction occurs when an element displaces another element from its compound?

  • Displacement reaction (correct)
  • Exothermic reaction
  • Decomposition reaction
  • Combination reaction
  • Which of the following best describes a double displacement reaction?

  • Two substances combine to form a single substance
  • Energy is absorbed
  • A single substance decomposes to give two or more substances
  • Two different atoms are exchanged (correct)
  • In a precipitation reaction, what is produced?

  • Insoluble salts (correct)
  • Acids
  • Gases
  • Soluble salts
  • What is the defining characteristic of an exothermic reaction?

    <p>Heat is given out</p> Signup and view all the answers

    What happens in a displacement reaction?

    <p>An element displaces another element from its compound</p> Signup and view all the answers

    Which process involves the gain of oxygen or loss of hydrogen?

    <p>Oxidation</p> Signup and view all the answers

    Which type of reaction involves the exchange of ions to form products?

    <p>Double displacement reaction</p> Signup and view all the answers

    In a displacement reaction, a more reactive element displaces a less reactive element from its compound. Which statement best explains why this occurs?

    <p>The more reactive element has a higher tendency to lose electrons</p> Signup and view all the answers

    Which of the following reactions is an example of a displacement reaction?

    <p>Zinc + Silver nitrate → Zinc nitrate + Silver</p> Signup and view all the answers

    Which of the following reactions involve the release of energy in the form of heat and light during the reaction?

    <p>Exothermic reactions</p> Signup and view all the answers

    What type of reaction occurs when two compounds exchange ions to form new compounds?

    <p>Double displacement reaction</p> Signup and view all the answers

    In a displacement reaction, why does the more reactive element displace the less reactive one from a compound?

    <p>Because it has a higher reduction potential</p> Signup and view all the answers

    In the reaction 2PbO(s) + C(s) → 2Pb(s) + CO2(g), which of the following statements is incorrect?

    <p>Carbon is getting oxidised.</p> Signup and view all the answers

    What type of reaction is represented by the equation Fe2O3 + 2Al → Al2O3 + 2Fe?

    <p>Displacement reaction.</p> Signup and view all the answers

    When dilute hydrochloric acid is added to iron fillings, what is the correct outcome?

    <p>Hydrogen gas and iron chloride are produced.</p> Signup and view all the answers

    What is the purpose of balancing a chemical equation?

    <p>To ensure conservation of mass in the reaction.</p> Signup and view all the answers

    Translate 'Hydrogen gas combines with nitrogen to form ammonia' into a balanced chemical equation.

    <p>H2 + N2 → NH3</p> Signup and view all the answers

    Balance the chemical equation NaCl + AgNO3 → AgCl + NaNO3

    <p>NaCl + 2AgNO3 → 2AgCl + NaNO3</p> Signup and view all the answers

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