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Quebec Secondaire (Uniform Exams) Chemistry — practice by topic

Browse 30 questions across 3 Chemistry topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Chemistry topics

Chemical Reactions (30)Chemistry (30)Stoichiometry (30)

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The number written to the left of a formula in a chemical equation is called a:Read the answer and worked solution →An equation with equal numbers of each element on both sides is described as:Read the answer and worked solution →A chemist writes a coefficient of one in front of a formula. Convention says this should be:Read the answer and worked solution →A balanced equation ends up with coefficients 2, 4 and 6. Convention asks for the smallest whole:Read the answer and worked solution →

Worked practice questions

The number written to the left of a formula in a chemical equation is called a:

  1. Coefficient
  2. Coordinate
  3. Compression
  4. Combination
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Correct answer: A. Coefficient

1. It tells how many units of that species take part. 2. It sits immediately before the chemical formula. 3. That number is a coefficient. _Source: OpenStax Chemistry 2e, Chapter 4, Stoichiometry of Chemical Reactions._

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An equation with equal numbers of each element on both sides is described as:

  1. Buffered
  2. Balanced
  3. Bonded
  4. Boiled
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Correct answer: B. Balanced

1. Atoms are neither created nor destroyed in a reaction. 2. So each element must be counted equally on both sides. 3. Such an equation is balanced. _Source: OpenStax Chemistry 2e, Chapter 4, Stoichiometry of Chemical Reactions._

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A chemist writes a coefficient of one in front of a formula. Convention says this should be:

  1. Omitted
  2. Doubled
  3. Circled
  4. Bracketed
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Correct answer: A. Omitted

1. One unit is what a bare formula already means. 2. Writing the digit adds nothing to the meaning. 3. So a coefficient of one is omitted. _Source: OpenStax Chemistry 2e, Chapter 4, Stoichiometry of Chemical Reactions._

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