Matter

Definition

Matter is anything that has mass and takes up space. It exists in various phases, including solid, liquid, gas, and plasma.

5 Must Know Facts For Your Next Test

1. Matter can be classified based on its physical state: solid, liquid, gas, and plasma.
2. The Law of Conservation of Matter states that matter cannot be created or destroyed in an isolated system.
3. Atoms and molecules are the fundamental building blocks of matter.
4. Physical changes affect the form of a substance but not its chemical composition; chemical changes alter the substance's chemical structure.
5. Pure substances have a fixed composition and distinct properties, while mixtures consist of two or more substances physically combined.

Review Questions

• What are the four primary phases of matter?
• Explain the difference between physical and chemical changes in matter.
• How does the Law of Conservation of Matter relate to chemical reactions?

Related terms

Atom:

The smallest unit of an element that retains the properties of that element.

Molecule:

A group of two or more atoms bonded together representing the smallest fundamental unit of a chemical compound.

Mixture:

A combination of two or more substances where each retains its own chemical identity.