Beatty 14.4 METALS REVIEW(W4) 2023 Answers

1 Beatty Secondary School Science Department (Chemistry Unit) Chemistry 6092 Name: ___________________________________ ( ) Date: ________________ Class: 4E___ TOPIC: METALS REVIEW Multiple-Choice Questions 1 Which statement is not true for all metals? A They are malleable. B They conduct electricity. C They conduct heat. D They form coloured compounds. ( D ) 2 Which metal carbonate melts on heating but does not decompose? A calcium carbonate B magnesium carbonate C sodium carbonate D zinc carbonate ( C ) 3 Which compound does not give off a gas when heated? A hydrated copper(II) sulfate B hydrated sodium carbonate C magnesium carbonate D sodium carbonate ( D ) 4 When heated, solid X gives off a gas. When the gas is bubbled into limewater, a white precipitate is formed. The residue after heating solid X reacts with dilute acid and also with aqueous alkali. What is X? A copper(II) carbonate B magnesium carbonate C sodium carbonate D zinc carbonate ( D ) 5 The thermal stability of metal nitrates is related to the position of the metal in the reactivity series in the same way as carbonates. Which metal nitrate, on heating, will decompose to form the metal? A iron(III) nitrate B potassium nitrate C silver nitrate D sodium nitrate ( C ) 6 The carbonates of metals X and Y were heated in air. The carbonate of metal X changed colour from green to black when heated and carbon dioxide was given off. The carbonate of metal Y did not decompose. Which statements are correct? 1 Metal X is more reactive than metal Y. 2 Both metal carbonates would react with dilute nitric acid to form carbon dioxide. 3 Metal X could be a transition element. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only ( D )

2 7 The diagram compares the amount of carbon in two steels, P and Q. Which two diagrams correctly compare the strength and brittleness of P and Q? ( A ) 8 Metals W, X, Y and Z are placed in salt solutions as shown in the table. metal result of placing metal in solution of salt of W salt of X salt of Y salt of Z W no reaction X displaced Y displaced no reaction X no reaction no reaction no reaction no reaction Y no reaction X displaced no reaction no reaction Z W displaced X displaced Y displaced no reaction What is the order of reactivity of the metals from most reactive to least reactive? A Y → X → W → Z B Y → W → Z → X C Z → W → Y → X D Z → Y → X → W ( C )

3 9 Metal X is more reactive than metal Y which is more reactive than metal Z. The sulfates of X and Z are colourless; the sulfate of Y is blue. Which observation is correct? metal added to solution of sulfate solution of sulfate colour change A X Y blue → colourless B Y X colourless → blue C Y Z blue → colourless D Z Y blue → colourless ( A ) 10 How does the mass of a sample of copper( II) oxide chang e when it is he ated in hydrogen and in oxygen? mass after heating in hydrogen mass after heating in oxygen A decreases decreases B decreases unchanged C unchanged decreases D unchanged unchanged ( B ) 11 The ionic equations below represent the reactions between the metals copper, iron, zinc and X with solutions of the salts of the same metals. Cu + X2+ → no reaction Fe + Cu2+ → Fe2+ + Cu X + Zn2+ → X2+ + Zn Zn + Cu2+ → Zn2+ + Cu Zn + Fe2+ → Zn2+ + Fe Zn + X2+ → no reaction What is the correct order of reactivity of the metals? most reactive least reactive A Cu Fe Zn X B X Fe Zn Cu C X Zn Fe Cu D Zn X Cu Fe ( C ) 12 The table shows the results of adding weighed pieces of iron to solutions M and S. solution initial mass of iron / g mass of iron after 15 minutes / g M 5 4 S 5 4 What could the aqueous solutions M and S have been? M S A copper(II) sulfate silver nitrate B dilute hydrochloric acid sodium chloride C iron(II) chloride calcium chloride D magnesium chloride dilute sulfuric acid ( A )

4 13 The diagram shows apparatus for measuring the volume of hydrogen given off when an excess of dilute hydrochloric acid is added to powdered metal. The volume of gas is measured at room temperature and pressure. The experiment is ca rried out three times, using the same mass of powder each time but with different powders: • pure magnesium • pure zinc • a mixture of magnesium and zinc Which powder gives the greatest volume of hydrogen and which the least volume? greatest volume of H2 least volume of H2 A magnesium zinc B magnesium the mixture C zinc magnesium D zinc the mixture ( A ) 14 Molten iron from the blast furnace contains impurities. The process of turning the impure iron into steel involves blowing oxygen into the molten iron and adding calcium oxide. Which row correctly explains the reason for blowing oxygen and adding calcium oxide? blowing in oxygen adding calcium oxide A carbon is removed by reacting oxygen reacts with acidic impurities making slag B carbon is removed by reacting oxygen reacts with slag and so removes it C iron reacts with the oxygen reacts with acidic impurities making slag D iron reacts with the oxygen reacts with slag and so removes it ( A ) 15 Each beaker contains two str ips of metal fa stened together and immersed in hydrochloric acid. All the strips are of the same size. After five minutes, which beaker contains the least amount of zinc ions? D( A )

5 16 Experiments are carried out to arrange metals X, Y and Z in order of decreasin g reactivity. The table shows the results. experiment X Y Z Does the metal liberate hydrogen from dilute hydrochloric acid? yes no yes Is the metal oxide reduced by heating with carbon? yes yes no What is the correct order of reactivity of the metals? most reactive least reactive A X Z Y B Y X Z C Z X Y D Z Y X ( C ) 17 The diagrams show experiments involving the rusting of iron. Four statements are made with respect to tubes P, Q and R. 1 The iron nails in tube P will not rust when a rubber stopper is placed over the tube. 2 The iron nails in tube P will rust faster with the addition of mineral salts to water. 3 The iron nails in tube Q will rust due to the dissolved oxygen trapped in the oil. 4 The iron nails in tube R will not rust due to the absence of water. Which statements are correct? A 1 and 2 B 1 and 3 C 2 and 3 D 2 and 4 ( D ) 18 Which diagram correctly illustrates the conditions necessary for the rusting of iron a nd the metal that can be used to prevent rusting by sacrificial protection? ( D )

6 Structured questions 19 Zinc can be extracted from calamine, ZnCO3, in a two-stage process. Stage 1: ZnCO3 → ZnO + CO2 Stage 2: ZnO + C → Zn + CO (a) Explain why the same two -stage process cannot be used to extract sodium from sodium carbonate, Na2CO3. Sodium is a very reactive metal and forms Na + ions readily. Na + ions bind strongly to CO 32− ions. Hence, a large amount of energy is required to overcome the strong electrostatic forces of attraction between the oppositely charged ions to obtain sodium. Hence, electrolysis is used. (b) In the laboratory, two experiments were set up using zinc metal. For each experiment, describe what you would observe and how you would test any gases evolved. Write an equation for the reaction in each beaker. Zn + FeSO4 → ZnSO4 + Fe In the first experiment, zinc dissolves , with the green solution turning colourless and a grey solid is formed. This is because zinc is more rea