PS.8.1.1 Construct an explanation to classify matter as elements

Front

What is a chemical change?

Back

A process where substances combine or break apart to form new substances, often accompanied by energy changes. Example: The Statue of Liberty changing color over time.

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What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition. Example: Boiling water.

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What are physical properties?

Back

Characteristics of a substance that can be observed or measured without changing its identity, such as color, mass, and volume.

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What is a homogeneous mixture?

Back

A mixture in which the components are evenly distributed and not easily distinguishable. Example: Saltwater.

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What is a heterogeneous mixture?

Back

A mixture in which the components are not evenly distributed and can be easily distinguished. Example: Salad.

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What is an element?

Back

A pure substance that cannot be broken down into simpler substances by chemical means. Examples: Oxygen, Gold.

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What is a compound?

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A substance formed when two or more elements chemically bond together. Example: Water (H2O).

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What is the difference between a physical change and a chemical change?

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A physical change does not alter the chemical composition of a substance, while a chemical change results in the formation of new substances.

Front

What is the state of matter for water at 0°C?

Back

At 0°C, water can exist as both a solid (ice) and a liquid, depending on the conditions.

Front

What is the boiling point of water?

Back

The boiling point of water is 100°C at standard atmospheric pressure.