2022 NTSS Chemistry P1

1 This document consists of 10 printed pages. Setter: Ms Caley Ng NEW TOWN SECONDARY SCHOOL Preliminary Examination Secondary 4 Express / 5 Normal (Academic) NAME CLASS INDEX NUMBER Science (Chemistry) Paper 1 Multiple Choice Additional Materials: OTAS 5076/01, 5078/01 30 August 2022 1 hour 1145 – 1245 READ THESE INSTRUCTIONS FIRST Write your name, register number and class in the spaces provided above. Write in dark blue or black pen. Do not use staples, paper clips, glue or correction fluid. There are twenty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the OTAS. Read the instructions on the OTAS very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. A copy of the Data sheet is printed on page 9. A copy of the Periodic Table is printed on page 10. The use of an approved scientific calculator is expected, where appropriate.

2 1 A gas, X, is less dense than air and insoluble in water. Which is not a suitable method to collect the gas? 2 Several inks were analysed using chromatography. The chromatogram is shown below. Which dyes does the black ink contain? A blue and green B green and orange C red and blue D red and green Black Red Blue Green Orange

3 3 Which of the following chemicals could be used to distinguish between aqueous zinc sulfate and aqueous lead(II) nitrate? 1 aqueous barium nitrate solution 2 aqueous ammonia 3 aqueous sodium hydroxide A 2 only B 1 and 2 only C 1 and 3 only D 1, 2 and 3 4 The formulae of four ions are shown below. O2- F- Li+ Mg2+ Which statement about these ions is correct? A They all have the same number of protons in their nuclei. B They all have more electrons than protons. C They all have the electronic structure of a noble gas. D They all have the same number of electrons in their outer shells. 5 Which diagram shows a reaction occurring between two elements? 6 Calcium sulfite has the formula, CaSO3. What is the charge on the sulfite ion? A 2- B 3- C 2+ D 3+

4 7 50 cm3 of ethane is completely burnt in oxygen. 2C2H6 (g) + 7O2 (g) → 4CO2 (g) + 6H2O (g) Which volume of oxygen is used in this reaction at room temperature and pressure? A 50 cm3 B 100 cm3 C 175 cm3 D 350 cm3 8 The reaction between hydrochloric acid and sodium hydroxide is an exothermic reaction. Which graph shows the change in temperature of the reaction mixture with time until there is no further change? A B C D 9 Which reaction shows the underlined substance acting as an oxidising agent? A B C D 322 2SOO2SO ®+ 2223 3O6HC2AuO3H2AuC ++®+ ll 232 3CO2Fe3COOFe +®+ 22 I2KC2KIC +®+ ll

5 10 The gases Q and R react according to the equation below: Q (g) + R (g) → T (g) The reaction mixture is placed in a container at room temperature as shown in the figure below. Which of the following actions can speed up the formation of gas T? A Adding an inert gas into the container. B Lowering the piston into the container. C Placing the container into an ice bath. D Removing part of the reaction mixture from the container, while keeping the volume constant. 11 What is the ionic equation for the reaction between aqueous sodium hydroxide and dilute nitric acid? A H+ + OH- → H2O B HNO3 + OH- → H2O + NO3- C Na+ + NO3- → NaNO3 D Na+ + HNO3 → NaNO3 + H+ 12 Which row gives the correct classification of the four oxides? SO2 MgO CO PbO A basic acidic acidic amphoteric B basic amphoteric acidic basic C acidic basic neutral amphoteric D acidic neutral neutral basic

6 13 Element X is in Group I of the Periodic Table. Which statement describes the property of X? A A hard metal with low density B A soft metal with low density C A very reactive non-metal D A non-metal that readily forms X- ions 14 Metals P, Q, R and S are placed in salt solutions as shown in the table below. result of placing metal in solution of metal salt of P salt of Q salt of R salt of S P ✘ ✘ ✓ Q ✓ ✘ ✓ R ✓ ✓ ✓ S ✘ ✘ ✘ What is the order of reactivity of the metals, from most reactive to least reactive? A P, Q, R, S B P, S, Q, R C R, P, S, Q D R, Q, P, S 15 The diagrams represent different arrangements of atoms. Which diagram represents an alloy? key ✓ = reaction observed ✘ = no reaction observed

7 16 Approximately 40% of all iron and steel are produced by recycling. Three statements about the recycling of metals are listed. 1 Recycling reduces the amount of waste taken to landfill sites. 2 Recycling causes less environmental damage than mining. 3 Iron ore contains a higher percentage of iron than scrap steel. Which statements are possible reasons for recycling iron? A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3 17 The diagram shows the fractional distillation of petroleum. Which statement describes the use of the fraction collected at X? A It is used as a feedstock for the petrochemical industry. B It is used as a lubricant for machines. C It is used as fuel for aircraft. D It is used as material for surfacing roads. X heat

8 18 The formulae of three compounds are shown. C2H6 C4H8 C6H14 Which statement about these compounds is correct? A They have different general formulae. B Their chemical properties are similar. C Their physical properties are the same. D They are members of the same homologous series. 19 Which substance is polyunsaturated? A ethene B margarine C poly(ethene) D vegetable oil 20 The diagram shows part of the structural formula of a polymer. Which monomer is used to make this polymer? A B C D END OF PAPER

9 DATA SHEET Colours of Some Common Metal Hydroxides calcium hydroxide white copper(II) hydroxide light blue iron(II) hydroxide green iron(III) hydroxide red-brown lead(II) hydroxide white zinc hydroxide white

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