Practice Chemical Equations (4) - Chemical Reactions

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9 questions

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3 questions · about 2 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What is a chemical equation?
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Think about how equations represent numbers.
Question 2.
List the reactants in the equation: 2H₂ + O₂ → 2H₂O.
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Look for the substances on the left side.
3Question 3.
What does a chemical equation represent?
- Physical change
- Chemical reaction
- Both
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Focus on what changes in chemical composition.
4Question 4.
True or False: Balancing a chemical equation is necessary to show the conservation of mass.
- True
- False
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Consider what happens to atoms during reactions.
Question 5.
Balance the combustion reaction of ethane (C₂H₆): C₂H₆ + O₂ → CO₂ + H₂O and explain your balancing process.
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Start with the most complex molecule first and work your way through.
Question 6.
Given the reaction: Na + Cl₂ → NaCl, discuss how you would balance it and the rationale behind it.
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Consider the total number of atoms of each element.

5 more questions in this section. Enroll free to practise them all.