AQA GCSE Chemistry - Paper 1 questions and answers well illustrated.

AQA GCSE Chemistry - Paper 1 questions and answers well illustrated. What is the charge of a proton? - correct answers.+1 What is the charge of a neutron? - correct answers.0 What is the charge of an electron? - correct answers.-1 What is the relative mass of a proton? - correct answers.1 What is the relative mass of a neutron? - correct answers.1 What is the relative mass of an electron? - correct answers.Very small How many types of atoms do elements contain? - correct answers.Only one type What are compounds? - correct answers.Substances containing two or more different elements that are chemically bonded together What are mixtures? - correct answers.Substances containing two or more different elements that are not chemically bonded together What pattern is formed from carrying out paper chromatography? - correct answers.Chromatogram Which method of separation is useful to separate an insoluble solid from a liquid? - correct answers.Filtration Which method of separation is useful to separate a soluble solid from a liquid? - correct answers.Evaporation or Crystillisation Which method of distillation separates liquids with similar boiling points? - correct answers.Fractional distillation Who discovered that the plum pudding model was wrong? - correct answers.Ernest Rutherford Who devised an experiment that proved the existence of the neutron? - correct answers.Niels Bohr Why did Mendeleev leave gaps in his Table of Elements? - correct answers.To ensure that elements with similar properties stayed in the same groups. The gaps indicated the existence of undiscovered elements and allowed Mendeleev to predict what their properties might be How are the group number and the number of electrons in the outer shell of an element related? - correct answers.The group number tells you how many electrons are in the outer shell of an element. E.g. sodium is in Group 1 therefore it has 1 electron on its outer shell What kind of ions do metals form? - correct answers.Positive Where are the non-metals on the periodic table? - correct answers.On the right hand side Give three properties which are specific to transition metals - correct answers.1) They can form more than one ion e.g cobalt form Co2+ 2) They are often coloured, therefore compounds which contain them are colourful e.g. potassium chromate is yellow 3) They often make good catalysts e.g. nickel based catalysts are used in the hydrogenation of alkenes State three trends as you go down Group 1 - correct answers.1) Increased reactivity - the outer electron is more easily lost as the attraction between the nucleus and the electron decreases because the electron is further away from the nucleus 2) Lower melting and boiling points 3) Higher relative atomic mass What are the products of the reaction of a Group 1 metal and water - correct answers.Hydrogen gas and a metal hydroxide E.g. sodium + water --> sodium hydroxide + hydrogen What's the difference between the hardness of Group 1 and transition metals? - correct answers.Transition metals are harder, denser and stronger than Group 1 metals What's the difference between the reactivity of Group 1 and transition metals? - correct answers.Group 1 metals are much more reactive than transition metals What's the difference between the melting points of Group 1 and transition metals? -