Julie takes a cold glass of clear, colorless liquid out of the refrigerator and puts it on the table. As the liquid warms up to room temperature, Julie sees bubbles of gas form in the liquid and rise to the surface. Which conclusion is best supported by Julie’s observations?
Answer
A
The liquid is a mixture because its temperature rises.
B
The liquid is a pure substance because it is colorless.
C
The liquid is a mixture because it has a gas dissolved in a liquid.
D
The liquid is a pure substance because it remains liquid when cold.
Explanation
As the liquid warms, the gas becomes less soluble and escapes as bubbles. This supports the conclusion that the liquid is a mixture, since it contains both a liquid and dissolved gas. Being colorless or remaining liquid when cold does not show whether a substance is pure.
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