Question

1. the elements within a ______ can be separated by physical means.
2. the elements within a ______ can only be separated by a chemical change (reaction).
3. ice cream is classified as a(n)…
4. a platinum ring is classified as a(n)…
5. the ocean is classified as a(n)…
6. pure water is classified as a(n)…
7. a diamond is a(n)…
8. the air we breath is classified as a(n)…

Explanation:

1. Mixtures have elements that can be separated by physical means like filtration, evaporation etc.
2. Compounds are formed by chemical combination and can only be separated by chemical reactions.
3. Ice - cream is a heterogeneous mixture as it has different components that are not uniformly distributed.
4. A platinum ring is an element as it is made of only platinum atoms.
5. The ocean is a mixture containing water, salts, dissolved gases etc.
6. Pure water is a compound as it is made of hydrogen and oxygen chemically combined.
7. A diamond is an allotrope of carbon and is an element.
8. The air we breathe is a mixture of nitrogen, oxygen, carbon - dioxide and other gases.

Answer:

1. Mixture
2. Compound
3. Mixture
4. Element
5. Mixture
6. Compound
7. Element
8. Mixture