Chemistry revision 0.0 / 5 ? ChemistryRevisionGCSEAQA Created by: Millie FreeCreated on: 12-10-17 19:47 What is a displacement reaction? When a more reactive metal takes the place of a less reactive metal in a compound 1 of 22 What is an ore? A rock containing an economical amount of a metal compound 2 of 22 If a substance was a 9 on the PH scale , what would it be? An alkali 3 of 22 What is an alkali? They form oh- ions when they dissolve in water 4 of 22 What does titration do? Work out the unknown concentration of an acid or an alkali 5 of 22 How do you calculate concentration in titration? moles/volume/1000 6 of 22 How do you work out the percentage yield? Actual mass of product produced/ Maximum theoretical mass of product possible 7 of 22 Why might the yield may be less than 100%? Impure reactants, product lost in handling or left in apparatus 8 of 22 What is the relative atomic mass of lithium? 7 9 of 22 What do electrons do? They move around the nucleus in electron shell 10 of 22 What charge does a proton have? +1 11 of 22 Do atoms have a charge? No they are neutral 12 of 22 What does the atomic number tell you? How many protons there are 13 of 22 What is an element? a substance made up of atoms that all have the same number of protons in their nucleus 14 of 22 What is an compound? substances formed from two or more elements , which is held together by chemical bonds 15 of 22 What does fractional distillation do? separate a mixture of liquids 16 of 22 What did Ernest Rutherford do? Showed that the plum pudding model was incorrect 17 of 22 How many electrons are allowed on the 1st shell? A maximum of 2 18 of 22 What did Dmitri Mendeleev do? He left gaps in the periodic table and predicted new elements 19 of 22 Name 3 properties of metals they are strong, great at conducting heat and electricity and they have high melting and boiling points 20 of 22 What is the trends of group 7? As you do down the group the elements get less reactive , also they have higher melting and boiling points and they have higher relative atomic masses 21 of 22 Are all elements in group 0 colourless gases? Yes 22 of 22
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