Chemical and Physical Changes

Front

What is a chemical change?

Back

A chemical change occurs when the atoms in the reactants rearrange themselves and bond together differently to form one or more new products with different characteristics than the reactants.

Front

What is a physical change?

Back

A physical change is a change that does not alter the substance's chemical composition, meaning it does not change into a different substance.

Front

Is shredding a piece of paper a chemical or physical change?

Back

Physical Change

Front

Is ice melting a chemical or physical change?

Back

Physical Change

Front

Is boiling water a chemical or physical change?

Back

Physical Change

Front

What happens to the mass of matter when salt is dissolved in water?

Back

The total mass remains the same; for example, mixing 1 gram of salt with 50 grams of water results in 51 grams of matter.

Front

What is an example of a chemical change?

Back

Burning wood is an example of a chemical change because it produces new substances like ash and smoke.

Front

What is an example of a physical change?

Back

Melting ice is an example of a physical change because it changes from solid to liquid without forming a new substance.

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; it remains constant.

Front

What is a reactant?

Back

A reactant is a substance that undergoes a chemical change in a reaction.