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GCE N-Level (Singapore) Atoms — practice questions

Explore 30 free Atoms questions in GCE N-Level (Singapore) Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Atoms questions and exercises with answers

Showing questions 1–30 of 30.

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 →The scientist who produced a visible beam in a cathode ray tube was:Read the answer and worked solution →The oil drop experiments measuring the charge on an electron were performed by:Read the answer and worked solution →Those experiments showed the charge on a droplet was always a multiple of one fundamental:Read the answer and worked solution →Because subatomic particles were found, the atom turned out not to be:Read the answer and worked solution →Thomson's early model, with electrons embedded in positive matter, is likened to:Read the answer and worked solution →The physicist who fired alpha particles at gold foil was:Read the answer and worked solution →In that experiment, what most of the alpha particles did was pass through the foil:Read the answer and worked solution →That result showed most of the inside of an atom is essentially:Read the answer and worked solution →The small, heavy, positively charged body at the centre of an atom is the:Read the answer and worked solution →Most of an atom's mass is concentrated in the:Read the answer and worked solution →The remaining nuclear mass beyond the protons was explained by neutral particles called:Read the answer and worked solution →The number of protons in the nucleus of an atom is its atomic:Read the answer and worked solution →Any atom containing six protons must be the element:Read the answer and worked solution →An atom is electrically neutral when its protons equal its:Read the answer and worked solution →An atom carrying an electrical charge because those numbers differ is called an:Read the answer and worked solution →An atom that gains one or more electrons becomes an:Read the answer and worked solution →An atom that loses one or more electrons becomes a:Read the answer and worked solution →Natural abundances of isotopes are measured with an instrument called a mass:Read the answer and worked solution →Catch the atom partsRead the answer and worked solution →Pop the atomic scientistsRead the answer and worked solution →Run the atom gatesRead the answer and worked solution →Slice the chemistry wordsRead the answer and worked solution →Cation or anionRead the answer and worked solution →Sort the chemistry wordsRead the answer and worked solution →Type the numberRead the answer and worked solution →Atoms bingoRead 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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More Chemistry topics

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