GG: Chemical Reactions

Front

What is a physical change?

Back

A physical change is a change that does not result in the formation of new substances. Examples include melting, freezing, and dissolving.

Front

What is a chemical change?

Back

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

Front

What happens to the number of atoms in a chemical reaction?

Back

The number of atoms remains the same before and after a chemical reaction; they are rearranged to form new substances.

Front

What is the role of a materials scientist?

Back

A materials scientist studies chemical reactions to create new materials and understand their properties.

Front

What are properties of matter?

Back

Properties of matter include characteristics such as magnetism, color, odor, density, and state (solid, liquid, gas).

Front

What is an example of a physical change?

Back

An example of a physical change is ice melting into water.

Front

What is an example of a chemical change?

Back

An example of a chemical change is the combustion of gasoline in a car engine.

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.

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together.