Chemistry

Matter

Atom: Smallest unit of matter. Consists of protons neutrons and electrons.

Element: Substance made of only one kind of atom; therefore pure.

Compound: Two or more diffrent elements bonded together.

Molecule: Group of atoms held together by covalent bonds.

Ion: An atom of molecule that has gained or lost electrons.

Water and Solutions

• Water is a major component of cells.
• Cells are filled with water.
• Most cellular events use water as their medium.
• Helps maintain homeostasis.

Cohesion: Attraction between substances of the same kind.

Adhesion: Attraction between diffrent substances. Capllary action powered by adhesion moves water through a plant.