Physical and Chemical Changes

Front

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. Examples include melting, freezing, and dissolving.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and changes the molecular structure of the substance.

Front

What is an example of a physical change?

Back

Examples of physical changes include boiling water, melting ice, and breaking glass.

Front

What is an example of a chemical change?

Back

Examples of chemical changes include rusting of iron, burning wood, and baking a cake.

Front

What are indicators of a chemical change?

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Indicators of a chemical change include color change, temperature change, gas production, and the formation of a precipitate.

Front

What happens to the molecules during a physical change?

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During a physical change, the arrangement of molecules may change, but their chemical structure remains the same.

Front

What happens to the molecules during a chemical change?

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During a chemical change, the bonds between atoms are broken and new bonds are formed, resulting in the creation of new substances.

Front

Is dissolving sugar in water a physical or chemical change?

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Dissolving sugar in water is a physical change because the sugar can be recovered by evaporating the water.

Front

Is burning paper a physical or chemical change?

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Burning paper is a chemical change because it produces new substances such as ash and smoke.

Front

What is rusting?

Back

Rusting is a chemical change that occurs when iron reacts with oxygen and moisture in the air, forming iron oxide (rust).