Chemical reactions and equations
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Chemical Reactions Exam Prep
English 10 leveled MCQs Free
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6 marks Long answer
Discuss the role of catalysts in chemical reactions.
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Catalysts speed up reactions by lowering activation energy without being consumed in the process.
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5 marks Long answer
Write the balanced equation for the combustion of methane (CH₄).
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CH₄ + 2 O₂ → CO₂ + 2 H₂O.
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4 marks Medium answer
Explain the steps to balance a chemical equation.
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1. Write the unbalanced equation. 2. Count atoms of each element. 3. Adjust coefficients to balance. 4. Check and ensure mass is conserved.
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4 marks Medium answer
Describe the different types of chemical reactions.
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Types include synthesis, decomposition, single replacement, double replacement, and combustion reactions.
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3 marks Medium answer
Differentiate between exothermic and endothermic reactions.
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Exothermic reactions release heat, while endothermic reactions absorb heat.
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3 marks Medium answer
What is the significance of balancing chemical equations?
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Balancing ensures the Law of Conservation of Mass is obeyed, showing equal numbers of atoms for each element on both sides.
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1 marks Short answer
Define a chemical reaction.
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A chemical reaction is a process that transforms one or more substances into different substances.
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1 marks Short answer
What is a reactant?
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A reactant is a substance that undergoes change during a chemical reaction.
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1 marks Short answer
What is a product in a chemical reaction?
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A product is a substance formed as a result of a chemical reaction.
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1 marks Short answer
State the Law of Conservation of Mass.
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The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction.
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