Chemistry Basics

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What is a chemical change?

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A chemical change is a process where one or more substances are transformed into different substances with new chemical properties. Example: Burning of 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. Example: Cutting a piece of paper.

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Give an example of a physical change.

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Crumpled paper, pencil sharpening, or melting ice.

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What is an example of a chemical change?

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Burning of wood or a copper penny turning green.

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What happens during a phase change?

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During a phase change, a substance changes from one state of matter to another (solid, liquid, gas) without changing its chemical composition.

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

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A chemical change results in the formation of new substances, while a physical change does not change the chemical identity of a substance.

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What is an example of a substance undergoing a chemical change?

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Sour milk is an example of a chemical change.

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What indicates a chemical change has occurred?

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

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What is an example of bubbles forming during a reaction?

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Bubbles forming when vinegar is mixed with baking soda is an example of a chemical change.

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What is rusting an example of?

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Rusting is an example of a chemical change, where iron reacts with oxygen to form iron oxide.