9.4. Reactivity series
A subsection of Chemistry, 0620, through 9. Metals
Listing 10 of 452 questions
Use Some reactions of metals W, X, Y and Z are given below. metal reaction with water reaction with dilute hydrochloric acid W A few bubbles form slowly in cold water. Vigorous reaction. Gas given off. X Vigorous reaction. Metal melts. Gas given off. Explosive reaction. Should not be attempted. Y No reaction. No reaction. Z Does not react with cold water. Hot metal reacts with steam. Steady fizzing. Arrange these metals in order of reactivity. most reactive least reactive Which of these metals could be magnesium, copper? Examiner's Use The equation for the reaction of X with cold water is given below. 2X+ 2H2O2XOH+ H2Describe the test you would use to show that the gas evolved is hydrogen. How could you show that the water contained a compound of the type XOH? In which group of the Periodic Table does metal X belong? The ore of X is its chloride. Suggest how metal X could be extracted from its chloride.
0620_s06_qp_3
THEORY
2006
Paper 3, Variant 0
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For Examiner's Use The diagram shows a water treatment works. water in to homes chlorine added aluminium sulphate added sedimentation tank sand filter State one use of water in industry. Explain how the sand filter helps purify the water. The aluminium ions in aluminium sulphate cause clay particles to clump together. Describe a test for aluminium ions. test result Why is chlorine added to the water? For Examiner's Use Chlorine is in Group VII of the Periodic Table. When chlorine reacts with a solution of potassium bromide, the solution turns a reddish – brown colour. Write a word equation for this reaction. Explain why iodine does not react with a solution of potassium bromide. When chlorine reacts with sodium to form sodium chloride, energy is released. State the name given to a reaction which releases energy. What type of bonding is present in sodium chloride? Explain what happens in terms of electron transfer when a sodium atom reacts with a chlorine atom.
0620_s08_qp_2
THEORY
2008
Paper 2, Variant 0
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For Examiner's Use The table shows some observations about the reactivity of various metals with dilute hydrochloric acid. metal observations calcium many bubbles produced rapidly with much spitting copper no bubbles formed iron a few bubbles produced very slowly magnesium many bubbles produced rapidly with no spitting Put these metals in order of their reactivity. most reactive least reactive Zinc is between iron and magnesium in its reactivity. Suggest what observations are made about how fast the bubbles are produced when zinc reacts with dilute hydrochloric acid. Magnesium is extracted by the electrolysis of molten magnesium chloride. inert gas molten magnesium molten magnesium chloride iron cathode (–) anode (+) What information in the diagram suggests that magnesium is less dense than molten magnesium chloride? For Examiner's Use Suggest why magnesium has to be extracted by electrolysis rather than by heating its oxide with carbon. Suggest why a stream of inert gas is blown over the surface of the molten magnesium. State the name of a gaseous element which is inert. In some old magnesium manufacturing plants, coal gas is blown over the surface of the magnesium. The list shows the main substances in coal gas. carbon monoxide ethene hydrogen hydrogen sulfide methane Draw the structure of ethene showing all atoms and bonds. Suggest two hazards of using coal gas by referring to two specific substances in the list. substance hazard substance hazard For Examiner's Use Carbon monoxide can be removed from coal gas by mixing it with steam and passing the mixture over a catalyst of iron(oxide at 400 ºC. CO + H2O CO2 + H2 Write a word equation for this reaction. What does the symbol mean? Iron(oxide reacts with acids to form a solution containing iron(ions. Describe a test for aqueous iron(ions. test result
0620_s09_qp_2
THEORY
2009
Paper 2, Variant 0
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Questions Discovered
452