3 Weeks Test Review
3 Weeks Test Review. 1, 4, 3, 2. Which sample of matter is classified as a pure substance? (A) Air (B) milk (C) ammonia (D) seawater Air = homogeneous mixture of oxygen(~80%) and nitrogen (~20%) Ammonia NH3 (compounds are pure substances) Milk= cream and water (homogeneous mixture)
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