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1.3 Physical and Chemical Properties

Telling a physical change from a chemical one, and separating extensive properties that scale with sample size from intensive ones that do not.

Chemistry 2e, 1.3 Physical and Chemical Properties

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4 exercises

1.3 Exercise 2

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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1.3 Exercise 4

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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1.3 Exercise 6

Explain the difference between extensive properties and intensive properties.

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1.3 Exercise 8

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

density=massvolumed=mV\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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Adapted from General Chemistry © 2019 Rice University. Licensed under CC BY 4.0. Sources: Chemistry 2e, Chemistry: Atoms First 2e. Imported at revision 32c7196.