Physical and Chemical Changes

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What is a physical change?

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A physical change is a change in which the form or appearance of a substance changes, but its chemical composition remains the same. Examples include melting ice or dissolving sugar in water.

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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. Examples include rusting iron or burning wood.

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Define precipitate in the context of chemistry.

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A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

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What is a solute?

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A solute is the substance that is dissolved in a solution. For example, in saltwater, salt is the solute.

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What is a solvent?

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A solvent is the substance in which a solute is dissolved to form a solution. For example, in saltwater, water is the solvent.

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How do you calculate the total number of atoms in a chemical formula?

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Front

What happens when vinegar is mixed with baking soda?

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When vinegar (an acid) is mixed with baking soda (a base), a chemical reaction occurs, producing carbon dioxide gas, which creates bubbles.

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

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A physical change affects only the physical properties of a substance, while a chemical change results in the formation of new substances.

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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 to make ice.

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What is an example of a chemical change?

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An example of a chemical change is the combustion of gasoline in a car engine.