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CSEE (Form 4) The Particles That Substances Are Made Of — practice questions

Explore 2 free The Particles That Substances Are Made Of questions in CSEE (Form 4) Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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The Particles That Substances Are Made Of questions and exercises with answers

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What does an empirical formula show about a compound?Read the answer and worked solution →What name is given to compounds that exist as giant repeating lattices?Read the answer and worked solution →

Worked practice questions

What does an empirical formula show about a compound?

  1. The simplest ratio of its atoms
  2. The exact number of its atoms
  3. The shape the molecule takes
  4. The mass of one whole mole
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Correct answer: A. The simplest ratio of its atoms

1. A molecular formula gives the exact number of each type of atom in a molecule. 2. An empirical formula does not do that, it gives the simplest ratio of the atoms instead. 3. This is useful for network structures, which can contain millions of atoms in one lattice. 4. For carbon dioxide the two formulae look the same, because that formula is already the simplest ratio. _Source: Siyavula Physical Sciences Grade 10 (Everything Science, CC BY 4.0), Chapter 12: The particles that substances are made of_

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What name is given to compounds that exist as giant repeating lattices?

  1. Molecular liquids
  2. Network structures
  3. Simple molecules
  4. Isolated atoms
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Correct answer: B. Network structures

1. Small molecules such as water exist and interact as separate units. 2. Compounds that exist as giant repeating lattice structures are called network structures instead. 3. Diamond, graphite and a sodium chloride crystal are all examples. 4. Metals also count as network structures, since a piece of copper is one huge lattice. _Source: Siyavula Physical Sciences Grade 10 (Everything Science, CC BY 4.0), Chapter 12: The particles that substances are made of_

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