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Question
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
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Solution 1
- Ice
- Iron
- Hydrochloric acid
- Calcium oxide
- Mercury
Solution 2
- Ice, iron, calcium oxide, and mercury are pure substances because they consist of only one type of matter.
- Milk, hydrochloric acid (hydrogen chloride gas dissolved in water), brick and air are not pure substances because they contain particles of more than one type of matter.
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