Chemistry 2e · 1.3 Physical and Chemical Properties

Physical and Chemical Properties: practice problems

4 problems from the book, with its answers. Check your working, or have any of them explained to you on the whiteboard.

1. Exercises 27

   Classify each of the following changes as physical or chemical:

   (a) condensation of steam

   (b) burning of gasoline

   (c) souring of milk

   (d) dissolving of sugar in water

   (e) melting of gold

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2. Exercises 29

   The volume of a sample of oxygen gas changed from 10 mL to 11 mL as the temperature changed. Is this a chemical or physical change?

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3. Exercises 31

   Explain the difference between extensive properties and intensive properties.

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4. Exercises 33

   The density (d) of a substance is an intensive property that is defined as the ratio of its mass (m) to its volume (V).

   $$\text{density}=\frac{\text{mass}}{\text{volume}}\text{d}=\frac{\text{m}}{\text{V}}$$

   Considering that mass and volume are both extensive properties, explain why their ratio, density, is intensive.

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