Chemical and Physical Changes

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances with different properties. Examples include baking a cake, rusting iron, and burning wood.

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What is a physical change?

Back

A physical change is a process that alters the form or appearance of a substance but does not change its chemical composition. Examples include melting ice, dissolving sugar, and breaking glass.

Front

What happens to the properties of a substance during a chemical change?

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The properties of the original substances change completely, resulting in new substances with different physical and chemical properties.

Front

What happens to the weight of matter during a chemical change?

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The weight of matter stays the same during a chemical change, as mass is conserved.

Front

What is an example of a physical change?

Back

Dissolving sugar in water is an example of a physical change because the sugar can be recovered.

Front

What is an example of a chemical change?

Back

Baking a cake is an example of a chemical change because new substances are formed that cannot be reversed.

Front

What is rusting?

Back

Rusting is a chemical change that occurs when iron reacts with oxygen and moisture in the air, forming iron oxide.

Front

What is the boiling point of water on the Fahrenheit scale?

Back

The boiling point of water on the Fahrenheit scale is 212 degrees.

Front

What is the freezing point of water on the Celsius scale?

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The freezing point of water on the Celsius scale is 0 degrees.

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Can physical changes be reversed?

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Yes, many physical changes can be reversed, such as freezing and melting.