- Understanding compounds
- To separate compounds: You can use thermal decomposition or electrolysis
- John Dalton discovered elements and atoms through carefully measuring substances in experiments.
- Element = substance made of only one atom!
- Compound = substance made from elements chemically joined together
- Compounds properties are different to the properties of the elements its made from!
- Sodium chloride = salt... SAFE
- Sodium and chlorine = poisonous.... UNSAFE!