Chemical & Physical 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 ice or breaking glass.

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 cannot be reversed by physical means. Examples include burning wood or rusting iron.

Front

What happens during a chemical reaction?

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During a chemical reaction, reactants are transformed into products through the breaking and forming of chemical bonds, resulting in new substances.

Front

What kind of change is exploding fireworks?

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Exploding fireworks are a chemical change because they undergo a reaction that produces light, sound, and new substances.

Front

What kind of change is squeezing juice out of an orange?

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Squeezing juice out of an orange is a physical change because the juice is separated from the fruit without changing the chemical composition of the juice.

Front

What kind of change is mixing vinegar and baking soda?

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Mixing vinegar and baking soda is a chemical change because it produces carbon dioxide gas and new substances through a chemical reaction.

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What kind of change is breaking a window?

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Breaking a window is a physical change because it alters the shape and structure of the glass but does not change its chemical composition.

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What kind of change is toasting bread?

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Toasting bread is a chemical change because it involves a reaction that changes the bread's chemical structure, resulting in a different flavor and texture.

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 is an example of a reversible physical change?

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An example of a reversible physical change is freezing water to make ice, which can be melted back into water.