Physical and Chemical Changes

Front

What is a chemical change?

Back

A chemical change is a process where the identity of a substance is altered, resulting in the formation of one or more new substances.

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What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is an example of a chemical change?

Back

Burning wood, rusting iron, or baking a cake are examples of chemical changes.

Front

What is an example of a physical change?

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Melting ice, boiling water, or dissolving sugar in water are examples of physical changes.

Front

What indicates a chemical reaction has occurred?

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Signs of a chemical reaction include the formation of a gas, color change, temperature change, or the formation of a precipitate.

Front

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

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The main difference is that a chemical change alters the substance's identity, while a physical change does not.

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What are physical properties?

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Physical properties are characteristics of a substance that can be observed or measured without changing its identity, such as color, boiling point, and solubility.

Front

What are chemical properties?

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Chemical properties describe a substance's ability to undergo changes that transform it into different substances, such as reactivity with acids or flammability.

Front

Is dissolving sugar in water a chemical change?

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No, dissolving sugar in water is a physical change because the sugar can be recovered by evaporating the water.

Front

What happens to the mass of substances during a chemical change?

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The mass of substances is conserved during a chemical change; it does not change.