Chemistry

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Across
  1. 2. - The basic units of matter and the defining structure of elements (5 letters).
  2. 4. - Substances that consist of only one type of atom (8 letters).
  3. 6. - Groups of two or more atoms bonded together (9 letters).
  4. 7. - The movement of water across a membrane from an area of low solute concentration to high solute concentration (7 letters).
Down
  1. 1. - The process by which particles spread from areas of high concentration to low concentration (9 letters).
  2. 3. - Anything that occupies space and has mass (6 letters).
  3. 5. - Substances formed from two or more elements chemically bonded together (9 letters).