Self Check: Physical & Chemical Changes

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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 changes in state (like melting or freezing) and changes in shape or size.

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What is a chemical change?

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A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and can be indicated by changes such as color change, gas production, or energy release.

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What are indicators of a chemical change?

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Indicators of a chemical change include a change in color, production of gas, formation of a precipitate, and release or absorption of energy.

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What is an example of a physical change?

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An example of a physical change is breaking a glass. The glass changes shape but remains glass.

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What happens 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 new substances.

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What is the difference between physical and chemical changes?

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Physical changes do not alter the chemical composition of a substance, while chemical changes do.

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What is an endothermic reaction?

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An endothermic reaction is a chemical reaction that absorbs energy from its surroundings, usually in the form of heat.

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What is an exothermic reaction?

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An exothermic reaction is a chemical reaction that releases energy to its surroundings, usually in the form of heat or light.

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What is an example of a chemical change?

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An example of a chemical change is baking a cake, where ingredients undergo a chemical reaction to form a new product.

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What is the significance of gas formation in a reaction?

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Gas formation during a reaction often indicates a chemical change has occurred, as new substances are being produced.