1. What is matter?
    Matter is anything that possesses mass and occupies space.
  2. What are the two main categories of matter?
    Elements and compounds.
  3. What is an element?
    A substance made up of entirely one type of atom.
  4. What is a compound?
    A substance consisting of two or more different elements chemically bonded together.
  5. What does the Kinetic Theory of Matter state?
    All matter is composed of tiny, discrete particles in constant motion.
  6. What are the fundamental particles of matter?
    Atoms, molecules, and ions.
  7. What is an atom?
    The smallest particle of an element that retains the chemical properties of that element.
  8. What is a molecule?
    Two or more atoms chemically bonded together.
  9. What is an ion?
    An atom or molecule that has gained or lost electrons, resulting in a net electrical charge.
  10. What are the three primary states of matter?
    Solid, liquid, and gas.
  11. Describe the arrangement of particles in a solid.
    Closely packed in a fixed arrangement.
  12. Describe the arrangement of particles in a liquid.
    Closely packed, but less tightly than solids, and can move around.
  13. Describe the arrangement of particles in a gas.
    Far apart with weak attractive forces.
  14. What is evaporation?
    The process of a liquid changing to a gas.
  15. What is melting?
    The process of a solid changing to a liquid.
  16. What is boiling?
    The process of a liquid changing rapidly to a gas.
  17. What is freezing?
    The process of a liquid changing to a solid.
  18. What is condensation?
    The process of a gas changing to a liquid.
  19. What is sublimation?
    The process of a solid changing directly to a gas.
  20. What happens to the temperature of naphthalene during melting?
    It remains constant.

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