Chemical and Physical Properties and 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. Examples include rusting, burning, and reacting vinegar with baking soda.

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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 ice, boiling water, and cutting paper.

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What is density?

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Density is a physical property that measures how much mass is contained in a given volume. It is calculated by dividing mass by volume (Density = Mass/Volume).

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What is a chemical property?

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A chemical property is a characteristic of a substance that can only be observed during a chemical reaction. Examples include flammability, reactivity with acids, and the ability to rust.

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What is a physical property?

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A physical property is a characteristic of a substance that can be observed or measured without changing the substance's chemical identity. Examples include color, boiling point, and density.

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What evidence indicates a chemical change has occurred?

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

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What is flammability?

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Flammability is a chemical property that describes how easily a substance can ignite and burn in the presence of oxygen.

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What happens to the wick of a candle when it burns?

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When a candle burns, the wick undergoes a chemical change, turning from white to black due to the formation of carbon as it burns.

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Is rusting of iron a chemical or physical change?

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Rusting of iron is a chemical change because it involves a reaction with oxygen in the air to form a new substance, iron oxide.

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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 with different properties, while a physical change does not change the chemical composition of the substance.