2021 SASS 4E Chem MYE P1

1 SCI7015GD © SASS 2021 Mid–Year Examination 2021/4 Express/Chemistry/Paper 1 Candidate Name __________________________________ CHEMISTRY 6092/1 Paper 1 Tuesday 11 May 2021 1 hour READ THESE INSTRUCTIONS FIRST Do not open this question paper until you are told to do so. Write your name, index number and class in the spaces provided on this question paper and the Answer Sheet. Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. There are forty 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 separate Answer Sheet. Read the instructions on the Answer Sheet 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 question paper. A copy of the Periodic Table is printed on page 16. The use of an approved scientific calculator is expected, where appropriate. This question paper consists of 16 printed pages. Class Index Number [Turn over ST ANDREW’S SECONDARY SCHOOL MID-YEAR EXAMINATION 2021 SECONDARY 4 EXPRESS ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL

3 [Turn Over Mid–Year Examination 2021/4 Express/Chemistry/Paper 1 1 The diagram shows how the arrangement of particles changes during its change in state. What change in state is shown? A Boiling B Condensation C Evaporation D Sublimation 2 A paper chromatography experiment is carried out to separate and identify the mixture of amino acids produced from the hydrolysis of a protein. Which apparatus is needed? A chromatography paper, pencil, solvent B chromatography paper, locating agent, ruler, solvent C chromatography paper, locating agent, pencil. ruler, solvent D chromatography paper, locating agent, pencil, ruler, solvent, thermometer 3 A student investigated the diffusion of ammonia gas and hydrogen chloride gas. Two sets of apparatus were set up at room temperature and pressure. The damp blue litmus paper in apparatus 2 changed colour after 30 seconds. How long does it take for the damp red litmus paper to change colour in apparatus 1? A 13 seconds B 22 seconds C 30 seconds D 64 seconds 4 Chloroform, CHCl3, is an organic solvent once used as an anaesthetic. CHCl3 has a boiling point of 61.2 oC. A test tube of CHCl3 was found contaminated with a very small amount of water. What is the boiling point of a sample obtained from this test tube? A 60.5 oC B 61.2 oC C 61.9 oC D 100 oC 2 © UCLES 2017 0439/11/O/N/17 1 T h e d i a g r a m s h o w s h o w t h e a r r a n g e m e n t o f p a r t i c l e s c h a n g e s w h e n a s u b s t a n c e c h a n g e s s t a t e . Which change of state is shown? A boiling B condensation C evaporation D sublimation 2 Which method can be used to separate a mixture of salt and water to obtain both parts of the mixture? A c r y s t a l l i z a t i o n B d i s t i l l a t i o n C e v a p o r a t i o n D f i l t r a t i o n 3 A s t u d e n t p u t 2 5 . 0 cm3 of dilute hydrochloric acid into an Erlenmeyer flask. The student added 2.5 g of solid sodium carbonate and measured the change in temperature of the mixture. Which apparatus does the student need to use to obtain the most accurate results? A balance, graduated cylinder, thermometer B balance, pipet, stopwatch C balance, pipet, thermometer D buret, pipet, thermometer 4 P r o p a n o n e , C3H6O, is a liquid at room temperature. What is the boiling point of pure propanone? A – 6 1 °C to –51 °C B – 5 6 °C C 5 1 °C to 61 °C D 5 6 °C 2 © UCLES 2018 0971/21/M/J/18 1 A s t u d e n t i n v e s t i g a t e d t h e d i f f u s i o n o f a m m o n i a g a s , N H3, and hydrogen chloride gas, HCl. Two sets of apparatus were set up as shown at room temperature and pressure. apparatus 1 source of ammonia gas damp red litmus paper apparatus 2 source of hydrogen chloride gas damp blue litmus paper The damp red litmus paper in apparatus 1 changed colour after 30 seconds. How long does it take for the damp blue litmus paper to change colour in apparatus 2? A 6 4 s e c o n d s B 3 0 s e c o n d s C 2 1 s e c o n d s D The blue litmus paper would not change colour. 2 C h r o m a t o g r a p h y i s a t e c h n i q u e u s e d t o s e p a r a t e c o l o u r e d d y e s . Which dye has an Rf value of 0.7? solvent front baseline A B dyes C D

4 Mid–Year Examination 2021/4 Express/Chemistry/Paper 1 5 When heated gently, solid iodine readily forms iodine vapour. What does this information suggest about the nature of the particles in these two physical states of iodine? Solid Vapour A Molecular Atomic B Molecular Molecular C Ionic Atomic D Ionic Molecular 6 The diagram shows some reactions of a solution of Q. What is the identity of Q? A Al2(SO4)3 B Ca(HCO3)2 C H2SO4 D PbSO4 7 Which of the following contains one mole of the stated particle? A Electrons in 1.00 g of helium B Electrons in 24.0 dm3 of hydrogen gas at room temperature and pressure C Molecules in 19.0 g of fluorine gas D Protons in 2.00 g of neon 8 For the reaction H2 (g) + F2 (g) ® 2HF (g), the enthalpy of reaction is –265 kJ/mol of HF (g) produced. If the bond energies for H2 (g) and HF (g) are 436 kJ/mol and 562 kJ/mol respectively, what is the bond energy for F2 (g) in kJ/mol? A 126 B 139 C 158 D 423 Q (aq)Excess Na(OH) (aq) Acidified BaCl2 (aq) Excess NH3(aq) Colourless solution Colourless solution White ppt.

5 [Turn Over Mid–Year Examination 2021/4 Express/Chemistry/Paper 1 9 The relative melting points of four consecutive elements in the Periodic Table are shown in the graph. The elements all have proton numbers of less than 20. Which element could be found in Group VI? 10 Solutions of 0.1 mol/dm3 Mg(NO3)2 and 0.1 mol/dm3 Ba(NO3)2 separately undergo a series of reactions using different reagents. M, N and P are magnesium compounds. Q, R and S are barium compounds. How many of M, N, P, Q, R and S are precipitates? A 2 B 3 C 4 D 5 11 Which statement about the properties of alkali metals or their compounds is correct? A Acidity of the oxides increases down the group. B Decomposition temperature of the carbonates decreases down the group. C Reactivity of the metals decreases down the group. D Thermal stability of the nitrates increases down the group. 12 Which compound is composed of a cation and anion(s) that do not contain the same number of electrons as each other? A LiH B NaOH C NH4F D TiCl3 5 © UCLES 2019 9701/11/M/J/19 [Turn over 11 T h e r e a c t i o n b e t w e e n s u l f u r d i o x i d e a n d o x y g e n i s r e v e r s i b l e . 2 S O 2(g) + O2(g) 2SO3(g) Kc = 280 mol–1 dm3 at 1000 K In an equilibrium mixture at 1000 K the sulfur trioxide concentration is 6.00 mol dm–3. The sulfur dioxide concentration is twice the oxygen concentration. What is the sulfur diox