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What is an atom The smallest part of anything that can exist
What is an element Molecules made of 1 type of atom
What is a compound Two or more elements chemically combined
What is a mixture Two or more elements or compounds not chemically combined
Describe filtration Separates solids and liquids
Describe crystallisation Separates solute and solvent
Describe distillation Separates to liquids with different boiling points
Describe chromatography Separates different solubilities
Describe the descovery of the atom -first atoms were thought to be solid spheres which couldn't be divided -plum pudding model negative electrons in positive shell -alpha particle scattering experiment proved that there was a positive nucleus with electrons orbiting in shells
Describe Rutherford's scattering experiment -Alpha particles fired at gold foil -most pass straight through -some deflect of at angles -very few bounced off
What are the charges and masses of subatomic particles Proton 1 and 1 Neutron 0 and 1 Electron -1 and 0
What is an isotope An element with a different number of neutrons
What is relative atomic mass The average mass of an element taking into account isotopes
Where are metals and non metals located on the periodic table Metals left Non metals right
How are the elements of the periodic table arranged In order of atomic number Elements with similar properties are in groups
What does an elements group number tell us about its electrons The number in its outer shell
Describe the development of the periodic table -arranged in order of atomic weight -mendeleev left gaps for undescovered elements -the gaps were filled in -knowledge of isotopes meant that atomic weight alone was incorrect
What type of ions do metals and non metals form Metal positive Non metal negative
Name 5 properties of metals -lose electrons -usually solid at room temperature -high melting and boiling points -good conductors -oxidise -dense -hard -usually shiny
Name 4 properties of non metals -poor conductors -brittle -gain electrons -most shiny -colourful -reduce
Describe the elements in group 0 -gas -inert -full outer shell -boiling point increases as you go down the group -used for electric lights
Describe the elements in group 1 -1 electron in outer shell -reactivity increases as you go down the group -reactivity with water to produce hydrogen and a salt -solid -metals
Describe the elements in group 7 -7 electrons in outer shell -boiling point increases as you go down the group -reactivity decreases as you go down the group
Describe the transition metals -form coloured compounds -diferent charged ions -catalysts
Explain how the arrangement of electrons is related to the reactivity of the element Less electrons need to be transferred = more reactive
Balance this equation Fe + H2O -> H2 + FeO It is already balenced
Define soluble Dissolves in water
Define insoluble Does not dissolve in water
What is a solute A substance that is dissolved in a solution
What is a solvent A substance that the solute is dissolved in
Created by: Liam P