Physical and Chemical Changes, Temp. and Law of Cons. of Mass

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 cutting.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. Examples include burning, rusting, and digestion.

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction. The total mass of the reactants equals the total mass of the products.

Front

What happens to particles when energy is added?

Back

When energy is added to particles, they speed up, increasing their kinetic energy and often leading to a change in state.

Front

What are indicators of a chemical change?

Back

Indicators of a chemical change include a change in color, production of gas, formation of a precipitate, and release or absorption of energy.

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Is melting ice a physical or chemical change?

Back

Melting ice is a physical change because it changes from solid to liquid without altering its chemical composition.

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What is an example of a chemical change?

Back

An example of a chemical change is burning wood, which produces ash, smoke, and gases.

Front

What is an example of a physical change?

Back

An example of a physical change is cutting a piece of paper, which does not change the chemical structure of the paper.

Front

What occurs during rusting?

Back

Rusting is a chemical change that occurs when iron reacts with oxygen and moisture, forming iron oxide (rust).

Front

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

Back

A physical change alters the form or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of new substances.