Food Science Semester 1 Exam

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What is a pure substance?

Back

A pure substance is a material that has a consistent and definite composition, with distinct physical and chemical properties such as appearance, melting point, and reactivity.

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What is a mixture?

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A mixture is a combination of two or more substances that are not chemically combined, meaning they retain their individual properties.

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What is an example of a suspension?

Back

Sand in water is an example of a suspension, where solid particles are dispersed in a liquid but can settle over time.

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What is a colloid?

Back

A colloid is a mixture where tiny particles of one substance are evenly distributed throughout another substance, such as milk.

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What is a solution?

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A solution is a homogeneous mixture where one substance (the solute) is completely dissolved in another (the solvent), such as saltwater.

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What is the difference between a compound and a mixture?

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A compound is a substance formed when two or more elements are chemically bonded together, while a mixture consists of two or more substances that are physically combined.

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What is an element?

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An element is a pure substance that cannot be broken down into simpler substances by chemical means, consisting of only one type of atom.

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What is the melting point?

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The melting point is the temperature at which a solid becomes a liquid, indicating a change in state.

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What is reactivity?

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Reactivity refers to the tendency of a substance to undergo chemical reactions, either by itself or with other materials.

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What is an example of a pure substance?

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Salt (NaCl) is an example of a pure substance, as it has a uniform composition and distinct properties.