Revision Flashcards
Experiment to show diffusion
Potassium magnate and water
Put at bottom of beaker purple colour slowly spreads out
Smaller and lighter
diffuse quicker
Mixtures are
easily separated because there are no chemical bonds
How do you separate mixtures
Filtration - insoluble solids
Filter paper
Crystallisation - soluble solid Heat mixture solid left behind as liquid evaporates
Chromatography
Different dyes will move up the paper at
Different rates
Distillation
Simple distillation
Give an example
Used to separate out solution but different in things that you want to separate have to have very different boiling points
Sea water -> pure water
Fractional distillation
Fractional distillation used to deprecate a mixture of liquids
Mixtures joined together so can’t be separated
Atoms
Nucleus
Protons and neutrons
Electrons
In shells
Protons =
Electrons
Protons
Positive
Electrons
Negative
Neutrons
Neutral
If you add or remove an electron
Then becomes an ion
Mass number
Protons and neutrons
Atomic number
Number of protons
Molecules is a
Group of atoms
Molecules
Held together by covalent bonds
A molecule with 2 atoms is called a
Diatomic molecule
Compounds are chemically bonded
Formed from chemical reactions difficult to separate
Elements in a group have the same number of
Electrons in there putter shell
Ionic
Metal and non metal
In ionic bonding atoms lose or gain electrons to form
charged particles
Diffusion
The movement of particles through a liquid or gas
