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 importance of balancing chemical equations.
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Balancing chemical equations ensures the law of conservation of mass is upheld and accurately represents the reaction.
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5 marks Long answer
Write and balance the chemical equation for the combustion of propane ($C_3H_8$).
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The balanced equation is $C_3H_8 + 5O_2 ightarrow 3CO_2 + 4H_2O$.
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4 marks Medium answer
Explain the steps to balance a chemical equation.
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Identify reactants and products, count atoms, adjust coefficients to balance, and verify the balance.
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4 marks Medium answer
Describe a decomposition reaction with an example.
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A decomposition reaction involves a single compound breaking down into two or more products, e.g., $AB ightarrow A + B$.
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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 a synthesis reaction? Provide an example.
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A synthesis reaction is when two or more substances combine to form a single product, e.g., $A + B ightarrow AB$.
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3 marks Medium answer
What are the signs that a chemical reaction has occurred?
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Signs include color change, temperature change, gas production, and formation of a precipitate.
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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 are reactants and products in a chemical reaction?
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Reactants are the starting substances, and products are the substances formed as a result of the 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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