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BECE (Ghana) Compounds and Molecules — practice questions

Explore 2 free Compounds and Molecules questions in BECE (Ghana) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Compounds and Molecules questions and exercises with answers

Showing questions 1–2 of 2.

In one molecule of water, in what ratio are the atoms joined together?Read the answer and worked solution →What do we call the forces that hold the atoms of a molecule together?Read the answer and worked solution →

Worked practice questions

In one molecule of water, in what ratio are the atoms joined together?

  1. Two hydrogen to one oxygen
  2. One hydrogen to two oxygen
  3. Two hydrogen to two oxygen
  4. One hydrogen to one oxygen
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Correct answer: A. Two hydrogen to one oxygen

1. A water molecule is made of one oxygen atom and two hydrogen atoms. 2. That gives two hydrogen atoms for every one oxygen atom. 3. Every water molecule keeps this same fixed ratio, which is what makes water a compound. 4. Swapping the numbers around would describe a different substance altogether. _Source: Siyavula Natural Sciences Grade 8 (CC BY 4.0), Compounds_

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What do we call the forces that hold the atoms of a molecule together?

  1. Magnetic poles
  2. Chemical bonds
  3. Electric sparks
  4. Physical joints
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Correct answer: B. Chemical bonds

1. Atoms in a molecule are pulled towards each other by an attractive force. 2. That force acts a little like glue, holding the atoms in place. 3. The forces that hold atoms together are called chemical bonds. 4. Magnets attract in a similar way, but magnetic poles are not what joins atoms. _Source: Siyavula Natural Sciences Grade 8 (CC BY 4.0), Chemical bonds_

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