Changes in Matter Review GN

Front

What are reactants in a chemical reaction?

Back

Reactants are the molecules and atoms that we start with in a chemical reaction.

Front

In an ionic bond, what does the metal want to do with electrons?

Back

The metal wants to lose electrons.

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 reactants equals the total mass of products.

Front

If a reaction starts with 20g of reactants, what should the total mass of the products be?

Back

The total mass of the products should be 20g.

Front

What is the smallest unit of an element?

Back

The smallest unit of an element is an atom.

Front

What is a molecule?

Back

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

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together.

Front

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

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What is an example of a physical change?

Back

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

Front

What is an example of a chemical change?

Back

An example of a chemical change is rust forming on iron.