Physical and 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 shape (like cutting or breaking).

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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 the rearrangement of atoms. Examples include rusting of iron and spoiling of food.

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What is mass?

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Mass is a measure of the amount of matter in an object, typically measured in grams or kilograms. It is a property that depends on how much of the substance there is.

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What is density?

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Density is the mass of a substance divided by its volume. It is a measure of how much mass is contained in a given volume.

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What is boiling point?

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The boiling point is the temperature at which a liquid turns into vapor. It is a physical property of a substance.

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What is melting point?

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The melting point is the temperature at which a solid becomes a liquid. It is a characteristic property of a substance.

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What happens when iron rusts?

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When iron rusts, it undergoes a chemical change, reacting with oxygen and moisture to form iron oxide (rust).

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What happens when glass breaks?

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When glass breaks, it undergoes a physical change. The glass changes shape and size, but its chemical composition remains the same.

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Is making a paper airplane a physical or chemical change?

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Making a paper airplane is a physical change because it involves changing the shape of the paper without altering its chemical composition.

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Is spoiling food a physical or chemical change?

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Spoiling food is a chemical change because it involves the breakdown of food substances and the formation of new compounds.