Properties of Matter UNIT

Front

What happens to helium gas molecules when a balloon is popped?

Back

They will expand and flow through the room.

Front

What is an example of repetition in scientific experiments?

Back

Following the same procedure for multiple trials.

Front

What is the law of conservation of mass?

Back

The mass of the reactants must equal the mass of the products in a closed system.

Front

What is a physical change?

Back

A change that does not alter the chemical composition of a substance, such as chopping onions.

Front

How can you slow down a chemical reaction?

Back

By decreasing the temperature.

Front

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

Back

A physical change alters the form of a substance, while a chemical change alters its chemical composition.

Front

What is an example of a chemical change?

Back

Burning natural gas.

Front

What is the definition of matter?

Back

Anything that has mass and takes up space.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

Front

What is the definition of a reactant?

Back

A substance that undergoes a chemical change in a reaction.