Key takeaway
Physical techniques
Before you read
Test yourself first: 3 questions
Question 1 of 3
Which of the following is a pure substance?
Answer: C. Gold is a pure element. Air, salt water, and trail mix are mixtures.
Question 2 of 3
Which describes a mixture rather than a compound?
Answer: A. Compounds are chemically bonded in fixed ratios and need a reaction to separate. Mixtures are physically combined and separate by filtering, settling or evaporating.
Question 3 of 3
Filtration and evaporation are physical methods used to:
Answer: B. Physical separation techniques (filtering, evaporating) separate mixtures without a chemical reaction.
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