Practice Questions On Chemical Reactions (1.4.1) - Chemical Reactions and Equations

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6 sample questions

Question 1.
What happens when magnesium burns in the air?
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Think about the products of burning metals.
Question 2.
What is a chemical reaction?
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It involves changes in substances.
3Question 3.
What does a skeletal equation show?
- Only products
- Only reactants
- Chemical symbols and formulas
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Think of the simplest representation of a reaction.
4Question 4.
True or False: Chemical equations must always be balanced.
- True
- False
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Remember the law of conservation.
Question 5.
Balance the equation for the combustion of propane: C3H8 + O2 → CO2 + H2O.
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Use the hit-and-trial method to balance each element.
Question 6.
Describe in detail the process of balancing a skeletal reaction, then perform it for: Fe + O2 → Fe2O3.
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Check reactants against products for balance.

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