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Cambridge International AS & A Level
4 UCS 2021 970122M21 2 The strength of interaction between particles determines whether the substance is a solid, liquid or gas at room temperature. (a) Lithium sulfide, Li 2 S, is a crystalline solid with a melting point of 938°C. It conducts electricity when it is molten. (i) Give the formulae of the particles present in solid lithium sulfide. [1]
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Cambridge International AS & A Level
gceguide.comD Railway fares can be taxed to raise money for the government only if railways are privatised. 17 Which tax is levied on a stock of wealth rather than a flow of income? A company profits tax ... C an appreciation of the exchange rate D an increase in government debt 28
Cambridge International AS & A Level
gceguide.com3 A ball is fired horizontally with a speed of 41.0 m s–1 from a stationary cannon at the top of a hill. The ball lands on horizontal ground that is a vertical distance of 57 m below the cannon, as shown in Fig. 3.1. path of ball horizontal ground cannon 57 m ball, initial speed 41.0 m s–1 Fig. 3.1 (not to scale) Assume air resistance is ...
Cambridge International AS & A Level
gceguide.comunified atomic mass unit 1 u –27= 1.66 × 10 kg rest mass of electron m e = 9.11 × 10 –31 kg rest mass of proton m p = 1.67 × 10 –27 kg molar gas constant R = 8.31 J K –1 mol ... 7 A cannon fires a cannonball with an initial speed v at an angle α to the horizontal. H v
Cambridge International AS & A Level
gceguide.com6 UCLES 2021 970142M21 (b) Heating of FeO results in the formation of Fe 3 O 4, as shown. reaction 1 4FeO → Fe + Fe 3 O 4 Each formula unit of Fe 3 O 4 contains one Fe2+ and two Fe3+ ions. (i) Show how reaction 1 can be described as a disproportionation reaction. [1] Fe 3 O 4(l) can be electrolysed using inert electrodes to form Fe. (ii) Write the half-equation for the …
Cambridge International AS & A Level
gceguide.comM2 (two) different groups on each C atom in the C=C / end of the C=C double bond M3 no / restricted rotation about C=C 3 3(d)(ii) H2 / hydrogen 1 3(d)(iii) M1 / M2 absorptions seen in both spectra (any two): (same) both show an absorption at 1680–1730 (cm–1) because of C=O
Cambridge International AS & A Level
gceguide.comCambridge International AS & A Level ECONOMICS 9708/12 Paper 1 Multiple Choice February/March 2021 1 hour ... 6 The diagram shows the market for sugar which is initially in equilibrium at a price of OP. P O P1 P2 LMN quantity price S D R U T S A government then fixes a maximum price of OP1.
Cambridge International AS & A Level
gceguide.com2(f) fertiliser 1 Question Answer Marks 3(a) hydrolysis 1 3(b) M1 both have molecular formula - C6H12O6 M2 idea that in glucose and fructose there are the same number and type of atoms present but the atoms are arranged in a different order ie one has a carbonyl group at the end of the chain/molecule and the other has a carbonyl group in the
Cambridge International AS & A Level
gceguide.com14 In a high-wire circus act, a man of mass 85 kg is standing at rest at the midpoint of the wire. 20° 20° T T The wire on either side of the man is at an angle of 20 to the horizontal. What is the tension T in the wire? A 0.44 kN B 0.89 kN C 1.2 kN D 2.4 kN 15 A cylindrical block of ice of cross-sectional area 12 m
Cambridge International AS & A Level
gceguide.com4 Originally, chemists thought indium oxide had the formula InO. By experiment they showed that 4.8 g of indium combined with 1.0 g of oxygen to produce 5.8 g of indium oxide. The Ar of oxygen was known to be 16. Which value for the Ar of indium is calculated using these data? A 38 B 77 C 115 D 154
Cambridge International AS & A Level
gceguide.com5 LS 2020 970122N20 [Turn over (e) Aluminium oxide, Al 2 O 3, reacts separately with both acids and alkalis. (i) Write an equation for the reaction of aluminium oxide with excess aqueous hydrochloric acid. [1] (ii) Write an equation for the reaction of aluminium oxide with excess aqueous sodium hydroxide. [1] (f) Describe the lattice structure of silicon(IV) oxide.
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