Chemical Reactions
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About this topic
This topic involves writing and balancing chemical equations, classifying reaction types (synthesis, decomposition, displacement), and understanding the law of conservation of mass. It builds competence in representing chemical changes accurately, a core skill for both School Based Assessment and summative ECZ examinations. Mastery here improves problem-solving abilities and prepares Zambian learners for exam questions on stoichiometry and reaction predictions.
What you'll practise (23 questions)
- Which type of reaction is represented by A + B → AB?
- Which of the following is a clean fuel?
- Which statement about catalysts is correct?
- Write a balanced chemical equation for the complete burning of benzoic acid (C₆H₅COOH) in air.
- Write a balanced chemical equation for the reaction of A and B (NaCl and H₂SO₄).
- Write a chemical equation for one of the reactions shown in the diagram.
- Write a balanced chemical equation with state symbols for the reaction between copper (II) carbonate and dilute sulphuric acid.
- Write an equation for the reaction when one of the metal oxides (aluminium oxide, zinc oxide) reacts with dilute hydrochloric acid.
- Write a balanced chemical equation with state symbols for the reaction of blue solution P with iron filings.
- Write a balanced chemical equation with state symbols for the reaction of substance T (copper(II) hydroxide) when strongly heated.
- Write the balanced equation for the complete combustion of the second alkane (ethane) showing the enthalpy of combustion.
- Which one is the balanced equation for the complete combustion of propane?
- Write the word equation for the reaction: Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g).
- What is the chemical equation for the reaction between magnesium and hydrochloric acid?
- What is the chemical equation for the reaction between calcium carbonate and hydrochloric acid?
- What is the chemical equation for the reaction between sodium hydroxide and hydrochloric acid?
- What is the chemical equation for the reaction between zinc and sulphuric acid?
- What is the chemical equation for the reaction between copper(II) oxide and sulphuric acid?
- What is the chemical equation for the decomposition of calcium carbonate by heat?
- What is the chemical equation for the electrolysis of water?
- What is the chemical equation for the reaction between sodium and water?
- What is the chemical equation for the combustion of methane?
- What is the chemical equation for the combustion of hydrogen?
Answer each question above to see the correct answer and a full explanation.