Chemistry

• What are the 3 physical states of matter? Solids, Liquids and Gases
• Describe what particle models look like? Solids - orderly rows, all touching, Liquids - random, touching, Gases - not touching
• Name all the changes of state? Solid - Gas: Deposition, Gas - Solid: Sublimation, Gas - Liquid: Condensation, Liquid - Gas: Evaporation, Solid - Liquid: Melting, Liquid - Solid: Freezing
• What do these changes result from? Melting, Evaporation, Sublimation - Heating / + energy, Freezing, Condensation, Deposition - Cooling / - energy
• What can particles be held together by? Strong chemical bonds or weak intermolecular forces
• What is diffusion? Going from an area of higher concentration to an area of lower concentration
• What is pressure? Pressure is how spread out a force is
• How do you calculate pressure?

  Force / Area
• How can you increase pressure? Increase the size of the force acting and decrease the area of which the force acts
• What is density? How much mass is in a certain volume
• How do you calculate density?

  Mass / Volume
• What are the sub-atomic particles in an atom? Protons, Neutrons and Electrons
• Which sub-atomic particles make the nucleus?

  Protons and Neutrons
• What is an element?

  One type of atom
• What is a molecule? Small group with strong chemical bonds
• What are compounds?

  Two or more types of atoms
• What are single atoms (gases)?

  Monatomic
• What are multiple atoms (gases)?

  Diatomic