Physical Changes and Chemical Reactions

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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, freezing, and breaking.

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What is a chemical change?

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A chemical change is a process that involves the transformation of one or more substances into different substances, characterized by the formation of new chemical bonds and the production of new materials.

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What evidence indicates a chemical change has occurred?

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Evidence of a chemical change includes the production of gas, color change, formation of a precipitate, and release or absorption of energy (light or heat).

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What is an example of a physical change?

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Melting ice is an example of a physical change, as it changes from solid to liquid without altering its chemical structure.

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What is an example of a chemical change?

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Burning wood is an example of a chemical change, as it produces ash and gases, indicating new substances have formed.

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What happens to the properties of a substance during a physical change?

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The properties of a substance may change in terms of state, shape, or size, but its chemical identity remains the same.

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What happens to the properties of a substance during a chemical change?

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The properties of a substance change completely, resulting in the formation of new substances with different chemical identities.

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

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

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What is an example of evidence for a chemical reaction?

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The formation of gas bubbles during a reaction is evidence of a chemical change.

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What is flammability?

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Flammability is a chemical property that describes the ability of a substance to ignite and burn in the presence of oxygen.