Matter and Energy

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What is a chemical change?

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A chemical change is a process where a new substance is formed, and it cannot revert back to the original substance. Examples include baking soda reacting with vinegar and wood burning.

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What is a physical change?

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A physical change is a change in size or shape where the substance can return to its original form. Examples include ripping paper or cutting wood.

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What happens when something contracts?

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When something contracts, it gets smaller and often cooler. This is a physical change.

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What are the states of matter?

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The states of matter are solid, liquid, and gas.

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What is a physical property?

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A physical property is a characteristic used to describe something, which can be observed using the five senses: sight, smell, taste, touch, and hearing.

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What is an example of a chemical change?

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An example of a chemical change is rust forming on iron.

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What is an example of a physical change?

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An example of a physical change is ice melting into water.

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What does it mean to expand?

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To expand means to increase in size or volume, often when heated.

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What is the conservation of mass?

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The conservation of mass states that mass cannot be created or destroyed in a chemical reaction; it only changes forms.

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What is an example of a physical property?

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An example of a physical property is the color of an object.