Physical and Chemical Changes #2

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, rusting, and combustion.

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, freezing, and dissolving.

Front

What happens when baking cupcakes?

Back

Baking cupcakes involves a chemical change as ingredients like flour, sugar, and eggs undergo reactions to form a new substance: the baked cupcake.

Front

What causes iron to rust?

Back

Iron rusts due to a chemical reaction with oxygen and moisture in the environment, forming iron oxide.

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What is an example of a new substance forming?

Back

Lighting a match is an example of a new substance forming, as the chemicals in the match head react to produce heat, light, and ash.

Front

What occurs when baking soda and vinegar are mixed?

Back

When baking soda and vinegar are combined, a chemical change occurs, producing carbon dioxide gas, water, and sodium acetate.

Front

Is melting a chocolate bar a physical or chemical change?

Back

Melting a chocolate bar is a physical change because it alters the state of the chocolate from solid to liquid without changing its chemical composition.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change does not alter the chemical composition of a substance, while a chemical change results in the formation of new substances.

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Can a chemical change be reversed?

Back

Some chemical changes can be reversed through other chemical reactions, but many are irreversible, such as burning wood.

Front

What is an example of a physical change?

Back

An example of a physical change is cutting a piece of paper, which changes its size and shape but not its chemical composition.