Chemical and Physical 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 iron and burning 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. Examples include melting ice and breaking glass.

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What is an example of a chemical change?

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A plant collecting sunlight and turning it into food (photosynthesis) is an example of a chemical change.

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What kind of change is breaking a window?

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Breaking a window is a physical change because the glass is still glass, just in smaller pieces.

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What kind of change is squeezing juice out of an orange?

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Squeezing juice out of an orange is a physical change because the juice is still part of the orange, just separated from the pulp.

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What kind of change is exploding fireworks?

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Exploding fireworks is a chemical change because it involves a chemical reaction that produces new substances and energy.

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What kind of change is freezing water into ice cubes?

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Freezing water into ice cubes is a physical change because the water changes state from liquid to solid but remains H2O.

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What happens during a chemical change?

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During a chemical change, bonds between atoms are broken and new bonds are formed, resulting in 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 melting ice, where the ice turns into water but remains H2O.

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How can you tell if a chemical change has occurred?

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Signs of a chemical change include color change, temperature change, gas production, and the formation of a precipitate.