Chemistry Unit 2 Review

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What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include hydrogen, oxygen, and carbon.

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What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together. Examples include water (H2O) and carbon dioxide (CO2).

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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 bonded. Mixtures can be homogeneous (uniform composition) or heterogeneous (distinct components).

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What is malleability?

Back

Malleability is the ability of a material to be hammered or pressed into thin sheets without breaking. Metals like gold and aluminum are highly malleable.

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What is boiling?

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Boiling is the process of converting a liquid into vapor when it reaches its boiling point. For example, water boils at 100°C (212°F) at sea level.

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What is a physical change?

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A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting ice or dissolving sugar in water.

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What is a chemical change?

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A chemical change occurs when a substance transforms into a different substance with different properties. Examples include rusting iron and burning wood.

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What is a solution?

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A solution is a homogeneous mixture where one substance (the solute) is dissolved in another (the solvent). An example is saltwater.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture in which the components are not uniformly distributed, and different parts can be seen. Examples include salad and sand.

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What is conductivity?

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Conductivity is the ability of a material to conduct electricity or heat. Metals are generally good conductors, while wood and plastic are poor conductors.