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.

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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.

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Example of a chemical change: Rust formation on a nail.

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Rust is formed when iron reacts with oxygen in the presence of moisture, creating iron oxide.

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Example of a physical change: Melting butter.

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Melting butter changes its state from solid to liquid but does not change its chemical composition.

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What happens during baking a cake?

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Baking a cake is a chemical change because it involves a series of reactions that transform the batter into a new substance.

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Is souring milk a chemical or physical change?

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Souring milk is a chemical change because it involves the fermentation of lactose into lactic acid.

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What is an example of a physical change?

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An example of a physical change is freezing water into ice.

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What is an example of a chemical change?

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An example of a chemical change is frying an egg, where the proteins in the egg undergo a chemical reaction.

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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.

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What is the difference between a reactant and a product?

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A reactant is a substance that undergoes a chemical change, while a product is a substance formed as a result of that change.