SOL 5.7 - Matter is anything that has mass and takes up space; and occurs as a solid, liquid, or gas.
Key concepts:

1. matter is composed of atoms;
2. substances can be mixed together without changes in their physical properties; and
3. energy has an effect on the phases of matter.

Central Idea: Matter is defined as anything that has mass and takes up space. Properties of various types of matter determine their uses.

WHAT IS MATTER?

Matter consists of atoms that have different properties. These properties determine interactions that can occur among different atoms. Different substances with different properties are suited to different uses.
• Matter is anything that has mass and volume.
• Matter is anything that has mass and takes up space (has volume)
• Mass is the amount of matter in an object
• Matter of any type can be subdivided into particles called atoms that are too small to see but can be detected by other means. Examples include blowing up a balloon, compressing air in a syringe, and dissolving sugar in water

• Many kinds of matter change from a solid to a liquid to a gas when undergoing a temperature increase.
• As temperature decreases, that matter changes from a gas to a liquid to a solid
• Matter does not gain or lose mass during phase changes

MIXTURES & COMPOUNDS

• Sometimes when two or more substances are combined, they do not lose their identifying characteristics. These substances are called mixtures. Examples of mixtures include soil, concrete, and a mud puddle

• Solutions are a special type of mixture in which one substance is uniformly dissolved in a liquid. Examples include sugar water, salt water, and soda