Chemistry Topic 1

Chemistry Topic 1

1. Atoms and their structure

   • Made up of neutrons, protons and electrons.
   • Atomic number is the number of protons and electrons.
   • Proton=+1, Neutrons=0, Electrons=-1

2. Isotopes

   • Isotopes are the atoms of an element with different numbers of neutrons. They have the same proton number, but different mass numbers.

3. Chemical equations, subscripts and superscripts

   • The subscript is the number after and below the element letter to show how many of each element there is
   • The superscript is shown where the atomic mass is next to an element in the periodic table.

4. Mixtures and how to separate them

   • Chromatography
     • Ink or plant dyes
   • Filtration
     • Insoluble from a liquid
   • Evaporation
     • Soluble from a liquid.
   • Simple distillation
     • Liquid from a solution
   • Fractional distillation
     • For two or more liquids

5. Models of the atom

   • Plum pudding
   • Nuclear model

6. Periodic table and how it's arranged.