8th Grade Unit #4 review

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is a substance formed when two or more different types of atoms bond together.

Front

What does the Law of Conservation of Mass state?

Back

The Law of Conservation of Mass states that matter cannot be created or destroyed in a chemical reaction; it can only be transformed.

Front

What is a pure substance?

Back

A pure substance is made up of only one type of particle, which can be either an element or a compound.

Front

What is an example of a chemical change?

Back

Baking cookies is an example of a chemical change because it results in the formation of new substances.

Front

How does temperature affect chemical reactions?

Back

Reactions happen slower when it is cold, as lower temperatures can reduce the energy and movement of particles.

Front

What is an atom?

Back

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

Front

What is a mixture?

Back

A mixture is a combination of two or more substances where each substance retains its own properties.

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

Melting ice is an example of a physical change because it changes from solid to liquid without altering its chemical structure.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.