Question

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Answer 1

Answer:

Solid Homogeneous Mixtures

Cement is a solid homogeneous mixture of calcium compounds. Mixed with sand, gravel and water, it becomes concrete, one of the most important building materials in the world. Many alloys are homogeneous mixtures of metals, or of a metal and a nonmetallic substance.

Explanation:

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Answer 2

Plastics are a wide range of synthetic or semi-synthetic materials that use polymers as a main ingredient. Their plasticity makes it possible for plastics to be moulded, extruded or pressed into solid objects of various shapes.

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