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GCE N-Level (Singapore) 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

Atomic Structure (30)Atoms (30)Chemistry (30)

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The English schoolteacher whose atomic theory revolutionised chemistry was John:Read the answer and worked solution →The rule that a pure compound always holds the same elements in the same proportion by mass is the law of:Read the answer and worked solution →The rule about two elements forming more than one compound is the law of:Read the answer and worked solution →A reaction that ends with fewer atoms than it started violates Dalton's postulate that atoms are neither created nor:Read the answer and worked solution →

Worked practice questions

The English schoolteacher whose atomic theory revolutionised chemistry was John:

  1. Dalton
  2. Dawson
  3. Denton
  4. Dunmore
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Correct answer: A. Dalton

1. He proposed that matter behaves as tiny particles. 2. His postulates explained several chemical laws. 3. That schoolteacher was John Dalton. _Source: OpenStax Chemistry 2e, Chapter 2, Atoms, Molecules, and Ions._

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The rule that a pure compound always holds the same elements in the same proportion by mass is the law of:

  1. Delayed proportions
  2. Definite proportions
  3. Divided proportions
  4. Doubled proportions
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Correct answer: B. Definite proportions

1. Proust demonstrated it with careful analysis. 2. The proportion never varies between samples. 3. That rule is the law of definite proportions. _Source: OpenStax Chemistry 2e, Chapter 2, Atoms, Molecules, and Ions._

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The rule about two elements forming more than one compound is the law of:

  1. Multiple proportions
  2. Mineral proportions
  3. Molecular proportions
  4. Measured proportions
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Correct answer: A. Multiple proportions

1. Two elements can combine in more than one ratio. 2. Those ratios stand in small whole-number relation. 3. That rule is the law of multiple proportions. _Source: OpenStax Chemistry 2e, Chapter 2, Atoms, Molecules, and Ions._

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