SASS Chem Properties and Uses of Ammonia

Page 1 ST ANDREW’S SECONDARY SCHOOL NAME CLASS DATE CHEMISTRY (G3) 6092 18.2 Properties and Uses of Ammonia AMMONIA Assessment for Learning 1 Two statements about the bubbling of ammonia in pure water are provided. Statement 1: pH of the pure water decreases. Statement 2: Ammonia increases alkalinity. Which is correct? A Both statements are correct and statement 2 explains statement 1. B Both statements are correct but statement 2 does not explain statement 1. C Statement 1 is correct but statement 2 is incorrect. D Statement 2 is correct but statement 1 is incorrect. 2 The diagram shows a bag of SUPERGROW fertiliser. Which combination of chemical compounds would produce the fertiliser? A Ca3(PO4)2, KCl and (NH4)2SO4 B CH3CO2K, CO(NH2)2 and Pb(NO3)2 C KH2PO4 and NH4NO3 D K2O and (NH4)3PO4 3 One mole of substance X forms three moles of ions in aqueous solution. Ammonium carbonate reacts with the aqueous solution of substance X to produce an acidic gas. Which compound could be substance X? A Ethanoic acid B Magnesium hydroxide C Sodium hydroxide D Sulfuric acid [Turn Over CHEMISTRY (G3) 6092 MARKING SCHEME Section A [5 Marks] 1 2 3 4 5 D B B D C Section B Qn Answers Mark Remarks 6 (a)(i) A and H [1] 6 (a)(ii) B [1] 6 (a)(iii) D [1] 6 (a)(iv) C and E or C and G [1] 6 (b) F F contains 10 electrons arranged in 3 electron shells, with its 2nd electron shell incompletely filled with only 6 electrons. [1] [1] Accept any plausible answers. 6 (c)(i) H– [1] Rej. chemical name / G–. 6 (c)(ii) Aluminium [1] 7 (a) X : Liquid Y : Liquid and Solid Z : Solid [1] deducted for each mistake [2] Rej. additional state(s) provided for each stage. 7 (b)(i) 113.7 [1] 7 (b)(ii) Heat energy is released to the surroundings (during freezing) as the particles are attracted to each other to form a solid. [1] 8 (a) –69 ℃ [1] 8 (b)(i) MgCl2 SCl2 [4] MgCl2 [1] stoichiometry and charge on both ions. [1] octet structure. SCl2 [1] no. of electrons shared. [1] no. of non-bonding / lone pair of electrons. ✓╳╳ Mg╳╳╳╳╳╳ 2+Cl−●●●●●●●╳2 ●╳SCl╳╳ ╳╳╳╳ Cl╳╳ ╳╳╳╳●╳●●●● ST ANDREW’S SECONDARY SCHOOL WEIGHTED ASSESSMENT 2 2022 SECONDARY 3 10 © UCLES 2015 0439/13/M/J/15 29 W h i c h c o m b i n a t i o n o f c h e m i c a l c o m p o u n d s c o u l d b e u s e d t o p r o d u c e t h e f e r t i l i z e r s h o w n ? SUPERGROW N P K 21 16 8:: A (NH4)3PO4, KCl B NH4NO3, Ca3(PO4)2 C NH4NO3, CO(NH2)2 D NH4NO3, K2SO4, (NH4)2SO4 30 B e l o w a r e t w o s t a t e m e n t s a b o u t s u l f u r d i o x i d e . 1 Sulfur dioxide is formed when fossil fuels burn and it is an acidic oxide. 2 Sulfur dioxide is one of the gases in the air which is responsible for ‘acid rain’. Which is correct? A Both statements are correct and statement 1 explains statement 2. B Both statements are correct but statement 1 does not explain statement 2. C Statement 1 is correct but statement 2 is incorrect. D Statement 2 is correct but statement 1 is incorrect. 31 Which method is not used for rust prevention? A coating working parts of industrial machinery with oil B covering wire for gardening use with plastic C immersing gardening tools in water for storage D painting car bodies 32 C a r b o n d i o x i d e a n d m e t h a n e a r e ‘ g r e e n h o u s e g a s e s ’ w h i c h c o n t r i b u t e t o g l o b a l w a r m i n g . Which process does not increase global warming? A burning fossil fuels B decay of organic waste C farming cattle for beef D growing crops such as sugar cane 50 kg !21 : 16 : 18

Page 2 4 The diagram shows an experiment on the aqueous solution of a fertiliser. Which pair of ions must be present in this fertiliser? A Fe2+ and SO42– B Fe3+ and NO3– C NH4+ and Fe2+ D NH4+ and NO3– 5 The diagram shows the reactions of an aqueous solution of substance Y during separate experiments. Which statement is not correct? A Both reactions are endothermic. B Neither reaction can be described as a redox reaction. C Substance Y does not contain carbonate ions. D The pH of the aqueous solution of substance Y in each experiment changes. 18 A solution of fertiliser was tested as shown. fertiliser solution add excess aqueous sodium hydroxide solution warm the mixture moist red litmus paper turns blue green precipitate forms Which ions must be present in the fertiliser? A 2+Fe and SO4 2– B 3+Fe and NO3 – C +NH4 and Fe2+ D +NH4 and NO3 – 19 The labels fell off two bottles each containing a colourless solution, one of which was sodium carbonate solution and the other was sodium chloride solution. The addition of which solution to a sample from each bottle would most readily enable the bottles to be correctly relabelled? A a m m o n i a B hydrochloric acid C l e a d (II) nitrate D sodium hydroxide Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ 14 © UCLES 2017 0620/02/SP/20 32 A catalytic converter removes harmful gases from motor car exhausts. W h i c h r e a c t i o n d o e s not take place in a catalytic converter? A 2CO + O2 → 2CO2 B N2 + 2CO2 → 2NO + 2CO C 2NO2 → N2 + 2O2 D 2NO2 + 4CO → N2 + 4CO2 33 T h e d i a g r a m s h o w s s o m e r e a c t i o n s o f s u b s t a n c e Y . substance Y a salt ammonia heat with an ammonium compound heat with dilute acid Which type of substance is Y? A a n a l c o h o l B a b a s e C a c a t a l y s t D a m e t a l no gasproduced a gas isproduced

Page 3 6 The diagrams show different experiments involving the formation of gases. In which experiment does the litmus paper used change colour? 7 Ammonium nitrate, NH4NO3, is a fertiliser used by most farmers today. Which statement describes an advantage of using NH4NO3 as a fertiliser? A NH4NO3 has a high percentage of nitrogen by mass. B NH4NO3 is chemically inert. C NH4NO3 produces ammonia gas readily when reacted. D Nitrates often leads to eutrophication in large water bodies. 8 In which equation is ammonia shown reacting as a base? A NH3 + CH2CH2Br ® CH3CH2NH2 + HBr B NH3 + H2O + CO2 ® (NH4)HCO3 C 2 NH3 + 2 Na ® 2 NaNH2 + H2 D 4 NH3 + 3 O2 ® 2 N2 + 6 H2O 45 A pale green solution X gives a green precipitate with excess aqueous sodium hydroxide. An alkaline gas is only given off when the mixture is warmed with powdered aluminium. Which ions does X contain? A a m m o n i u m a n d c o p p e r (II) B a m m o n i u m a n d i r o n (III) C copper(II) and nitrate D i r o n (II) and nitrate 46 The diagrams show mixtures of chemicals that react to produce gases. In which reaction will the litmus paper change colour? damp blue litmus paper dilute hydrochloric acid zinc A damp red litmus paper dilute hydrochloric acid sodium carbonate B damp blue litmus paper aqueous sodium hydroxide ammonium chloride C damp red litmus paper aqueous sodium hydroxide sodium nitrate and aluminium D Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/

Page 4 9 The objectives of two experiments are listed. Experiment 1: To measure the time taken to collect 50 cm3 of ammonia gas. Experiment 2: To measure the time taken to collect 220 cm3 of ammonia gas. The diagrams show three methods of collection of gases. Which method of collection of gases could be used for each experiment? Experiment 1 2 A 1, 2 and 3 1, 2 and 3 B 2 and 3 only 2 and 3 only C 2 only None of the methods shown D None of the methods shown 2 and 3 only 10 Methylamine, CH3NH2, has very similar chemical properties to ammonia, NH3. The reaction between methylamine and hydrogen chlor