Structure of Matter

Structure of Matter

Overview

Key Idea 1: All matter is made up of particles that take up space and have mass.

Key Idea 2: The molecules in matter are always moving

Key Idea 3: As a material is heated, its particles move faster and faster. When it is cooled, the particles move more slowly.

Key Idea 4: Matter usually exists in one of three phases: solid, liquid, or gas. The phases differ in the mobility of the molecules.

Key Idea 5: Materials change phase at temperatures where the speed of the molecules affects the arrangement of the molecules.

Key Idea 6: During chemical reactions, atoms are rearranged to form new molecules. Bonds between atoms are broken and/or reformed. Breaking the bonds between atoms requires energy.

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