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Key Stage 3 Science

QuestionAnswer
Describe the nature of atoms using Daltons atomic model Atoms are indestructible and cannot be created or destroyed
Describe the relative charge, relative mass and position of the three sub atomic particles •Proton: Charge +1, relative mass 1 , Position in the nucleus •Electron: Charge -1, relative mass 1/2000, Position in shells•Neutron: Charge 0, relatvive mass 1, Position in the nucleus
Define atomic number The number of protons in the nucleus
How can the mass and atomic numbers be used to work out the number of neutrons in an atom Number of Neutrons = Mass Number - Atomic Number
State the masximum number of electrons that can be held in the first three electron shells 2 in the first, 8 in the second, 8 in the third
State the chemical formulae of water, carbon dioxide, hydrochloric acid and methane. H2O, CO2, HCl, CH4
How many atoms of which elements are present in the following formuae CaCO3 and CuSO4 CaCO3 = 1x calcium, 1x carbon, 3 x oxygen CuSO4 = 1x copper, 1 x sufur, 4 x oxygen
Work out the relative formula mass of the following compounds MgO NH3 H2SO4 MgO = 40, NH3 = 17 H2SO4 = 98
How did Medeleev organise the elements using atomic mass and their properties •He listed elements in order of atomic mass • He put elements with similar properties in the same group
Having organised the elements based on atomic mass and properties what two further changes did Mendeleev make to his table • He left gaps for undiscovered elements •He swapped elements around to make sure elements with similar properties were in the same group
Where would you find metals and non metals in the periodic table Metals are on the left, Non Metals are on the right
Describe how the state, colour, and reactivity of the halogens changes down the group •Down the group the elements change from gas to liquid to solid • The elements get darker in colour down the group • The elements get less reactive down the group
Write word equations for the reactions of Magnesium and Carbon with oxygen Magnesium + Oxygen --> Magnesium Oxide , Carbon + Oxygen --> Carbon Dioxide
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