Physical and Chemical Changes, States of Matter

Front

What is a physical change?

Back

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 or dissolving sugar in water.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. Examples include rusting iron or burning wood.

Front

What are the three states of matter?

Back

The three states of matter are solid, liquid, and gas. Solids have a definite shape and volume, liquids have a definite volume but take the shape of their container, and gases have neither a definite shape nor volume.

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What is matter?

Back

Matter is anything that has mass and takes up space. It includes all physical substances.

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What happens during a chemical reaction?

Back

During a chemical reaction, substances (reactants) undergo a transformation to form new substances (products) with different properties.

Front

What is an example of a physical change?

Back

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 baking a cake, where ingredients react to form a new product.

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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, gas production (bubbles), temperature change, and the formation of a precipitate.

Front

What is the role of a magnifying glass in observing small objects?

Back

A magnifying glass helps to enlarge the appearance of small objects, making it easier to see details, such as the shape of sugar crystals.

Front

What is the difference between a mixture and a compound?

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A mixture is a combination of two or more substances that retain their individual properties, while a compound is a substance formed when two or more elements chemically bond together.