Transcription

GCSE ChemistryQuestion and Answers 2020/2021All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020

Table of ContentsAcids and Alkalis (Questions) * . 4Acids and Alkalis (Answers) . 6Atomic Structure (Questions) * . 8Atomic Structure (Answers) . 10Chemical Bonding (Questions) * . 13Chemical Bonding (Answers) . 15Extraction of Metals (Questions) . 17Extraction of Metals (Questions) . 20Metals - The Reactivity Series (Questions) *. 22Metals - The Reactivity Series (Answers). 24Products From Crude Oil (Questions) * . 26Products From Crude Oil (Answers). 27Radioactivity (Questions) * . 28Radioactivity (Answers) . 31Rates of Reaction (Questions) *. 33Rates of Reaction (Answers). 35The Earth and the Atmosphere (Questions) * . 38The Earth and the Atmosphere (Answers) . 40The Periodic Table (Questions) * . 42The Periodic Table (Answers) . 452All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020

Topics that only contain interactive questionsThese topics only contain interactive questions such as animations, multiple choice or audio files. Tointeract with this content, please go to www.s-cool.co.uk/biology. ElectrolysisWriting Formulae and Balancing Equations3All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020

Acids and Alkalis (Questions) *1.Complete the following table:pH of solution:Colour of universal indicator:Description:1(ii)strong acid(i)green(iv)14(iii)(v)(5 marks)(Marks available: 5)2.The following equation shows the reaction that takes place between an acid and an alkali:a) Name this type of reaction.(1 mark)b) Write a word equation that shows the reaction between nitric acid and potassium hydroxide.(1 mark)c) Write a symbol equation for the same reaction.(1 mark)(Marks available: 3)3.Complete the following equations:a) calcium carbonate nitric acid (1 mark)4All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020

b) sodium carbonate sulphuric acid (1 mark)c) Ethanoic acid sodium hydroxide (1 mark)(Marks available: 3)4.Some salts are made in industry for use as fertilizers in farming.Complete the table showing acid and alkali used to make these saltsSalt:Acid:Alkali:Ammonium nitratePotassium phosphate(4 marks)(Marks available: 4)5All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020

Acids and Alkalis (Answers)Answer outline and marking scheme for question: 1(i) 7(ii) red(iii) blue/purple(iv) neutral(v) strong alkali(Total 5 marks)Answer outline and marking scheme for question: 2a) Neutralisation.(1 mark)b) nitric acid potassium hydroxide potassium nitrate water(Mark is gained for writing potassium nitrate as the salt).(1 mark)c) HNO3(aq) KOH(aq) KNO3(aq) H20(aq)(1 mark)(Total 3 marks)Answer outline and marking scheme for question: 3a) calcium nitrate carbon dioxide water(1 mark)b) sodium sulphate water carbon dioxide(1 mark)6All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020

c) sodium ethanoate water(1 mark)(Total 3 marks)Answer outline and marking scheme for question: 4Salt:Acid:Alkali:Ammonium nitrateNitric acidAmmonium hydroxide(1 mark)(1 mark)Potassium phosphate Potassium hydroxide Phosphoric acid(1 mark)(1 mark)(Total 4 marks)7All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020

Atomic Structure (Questions) *1.Use the words below to name the four changes of state:melting; evaporation, freezing; condensing.(i) liquid to solid(ii) liquid to gas(iii) gas to liquid(iv) solid to liquid(Marks available: 2)2.Working on a piece of paper, complete the diagram below by drawing the arrangement of particles found in aliquid. One has already been placed in the box for you.(Marks available: 1)3.The following experiment was set up:8All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020

Hydrogen chloride gas is released from the concentrated hydrochloric acid.Ammonia gas is released from the concentrated ammonium hydroxide.After 10 minutes, white 'smoke' (ammonium chloride) was seen at X in the diagram.a) What scientific idea does this experiment demonstrate?(1 mark)b) Which of the two particles, ammonia of hydrogen chloride is the heaviest?Explain your answer.(2 marks)c) What would you see if the experiment was repeated at a higher temperature?(2 marks)(Marks available: 5)4.Atoms are made up of three types of particle - protons, neutrons and electrons.Complete the table showing the number of particles in the following atoms:Element:Atomic No:Mass No:Protons:Neutrons:Electrons:K19399All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020

Ar1840(Marks available: 3)5.a) Draw the electron arrangement of aluminium, Al.(2 marks)b) Give the symbol of the ion that aluminium is most likely to form.(1 mark)(Marks available: 3)Atomic Structure (Answers)Answer outline and marking scheme for question: 1(i) freezing(ii) evaporating(iii) condensing(iv) melting(4 correct 2 marks)(2 correct 1 mark)(Total 2 marks)Answer outline and marking scheme for question: 210All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020

(Total 1 mark)Answer outline and marking scheme for question: 3a) Diffusion(1 mark)b) Hydrogen chloride is the heavier particle,(1 mark)because it has not moved as far down the tube as the ammonia has.(1 mark)c) The ammonium chloride would be formed in the same place,(1 mark)but it would happen faster at a higher temperature.(1 mark)(Total 5 marks)Answer outline and marking scheme for question: 4Element:Protons:Neutrons: Electrons:K1939 -19 20 1911All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020

Ar1840 - 18 22 18(1 mark) (1 mark)(1 mark)(Answers for both atoms must be correct to gain the mark underneath)(Total 3 marks)Answer outline and marking scheme for question: 5a) Atomic number of Al 13 so there are 13 electrons present.(1 mark)b) Al3 (1 mark)(Total 3 marks)12All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020

Chemical Bonding (Questions) *1.The diagram below shows the electron arrangements of magnesium and oxygen:a) Draw a diagram showing how a bond is made between magnesium and oxygen.(2 marks)b) What name is given to this type of chemical bond?(1 mark)(Marks available: 3)2.a) What type of chemical bond would you expect in hydrogen fluoride, HF?(1 mark)b) Draw a diagram to show how this bond is formed.(2 marks)(Marks available: 3)3.Look at the diagram below:13All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020

a) Which type of structure is shown in the diagram?(1 mark)b) Will a material with this structure be able to conduct electricity?Explain your answer.(2 marks)(Marks available: 3)4.Look at the table below:Substance:Melting point ( C):A445B1907C-7(a) Which substance, A,B or C could have a metallic structure?(1 mark)b) Which substance, A, B or C could have a simple covalent structure?(1 mark)(Marks available: 2)14All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020

Chemical Bonding (Answers)Answer outline and marking scheme for question: 1a)(2 electrons moving 1 mark)(complete transfer 1 mark)b)Ionic(1 mark)(Total 3 marks)Answer outline and marking scheme for question: 2a) Covalent(1 mark)b)(1 mark 1 shared pair electrons)15All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020

(1 mark 1 electron from each atom)(Total 3 marks)Answer outline and marking scheme for question: 3a) Metallic.(1 mark)b) The material will be able to conduct electricity,(1 mark)because there are free electrons that are able to move through the structure.(1 mark)(Total 3 marks)Answer outline and marking scheme for question: 4a) B (highest melting point)(1 mark)b) C (lowest melting point)(1 mark)(Total 2 marks)16All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020

Extraction of Metals (Questions)1.The diagram below shows the blast furnace:a) Complete the labels A, B and C.(3 marks)b) What are the main waste gases from the blast furnace?(2 marks)(Marks available: 5)2.The following questions are about the blast furnace and the production of iron.a) Why are hot blasts of air blown in to the blast furnace?(1 mark)17All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020

b) Why is limestone added to the blast furnace?(1 mark)c) Railway lines are welded together using molten iron.The molten iron is made using the 'thermit' reaction where iron oxide is reacted with aluminium powder.Why is this reaction not used to make iron on a large scale?(1 mark)(Marks available: 3)3.Aluminium metal is produced using electrolysis.The cell used in this process is shown below:a) Complete the labels A, B and C.(3 marks)b) Why is cryolite added to the aluminium ore in this process?(1 mark)(Marks available: 4)18All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020

4.The following questions are about the electrolysis of aluminium oxide.a) Why does the anode need to be replaced regularly?(1 mark)b) Write an equation to show how aluminium ions are changed in to aluminium metal.(2 marks)c) Why can't the blast furnace be used to make aluminium?(1 mark)(Marks available: 4)19All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020

Extraction of Metals (Questions)Answer outline and marking scheme for question: 1a) A iron ore(1 mark)B slag(1 mark)C molten iron(1 mark)b) Carbon dioxide(1 mark)Nitrogen(1 mark)(Total 5 marks)Answer outline and marking scheme for question: 2a) The air is used to react with the coke/carbon to form carbon dioxide.(1 mark)b) To remove the impurities that are in the iron ore/to form slag.(1 mark)c) Any one from: Too expensive/aluminium is more expensive than iron. Too dangerous/aluminium reacts violently with iron oxide.(1 mark)(Total 3 marks)20All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020

Answer outline and marking scheme for question: 3a) A graphite electrodes.(1 mark)B molten bauxite/aluminium ore.(1 mark)C molten aluminium metal.(1 mark)b) To lower the melting point of the aluminium oxide (so less energy required).(1 mark)(Total 4 marks)Answer outline and marking scheme for question: 4a) The carbon/graphite anode reacts with the oxygen made to form carbon dioxide gas.(1 mark)b) Al3 (l) 3e- Al(l)(1 mark formulae, 1 mark balanced)c) Aluminium is more reactive than carbon (not too reactive).(1 mark)(Total 4 marks)21All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020

Metals - The Reactivity Series (Questions) *1.a) What would you expect to see if zinc metal was placed in to copper sulphate solution?(2 marks)b) What are the products formed in this reaction?(2 marks)(Marks available: 4)2.Complete the following equations to show what happens when metals are heated with oxides of other metals.a) magnesium copper oxide (1 mark)b) lead tin oxide (1 mark)c) Fe2O3(s) 3Zn(s) (2 marks)(Marks available: 4)3.When iron oxide is heated with aluminium powder, the following reaction takes place:Aluminiu

An experiment was set up as shown below: of air, the syringe on the right was empty.