Physical and Chemical Changes

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What is a chemical change?

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A chemical change is a process where substances combine or break apart to form new substances with different properties. Examples include baking a cake, rusting iron, and burning wood.

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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, breaking glass, and dissolving salt in water.

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Is baking a cake a physical or chemical change?

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Baking a cake is a chemical change because it involves a chemical reaction that transforms the ingredients into a new substance.

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Is breaking glass a physical or chemical change?

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

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Is dissolving salt in water a physical or chemical change?

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Dissolving salt in water is a physical change because the salt can be recovered by evaporating the water, and its chemical composition remains unchanged.

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Is adding sugar to coffee a physical or chemical change?

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Adding sugar to coffee is a physical change because the sugar dissolves in the coffee, but no new substances are formed.

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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.

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What are some 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.

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What is an example of a physical change?

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An example of a physical change is melting ice into water, where the state changes but the substance remains H2O.

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What is an example of a chemical change?

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An example of a chemical change is rust forming on iron when it reacts with oxygen and moisture.