2022 NBSS Chem Prelims P1

O NORTHBROOKS SECONDARY SCHOOL Preliminary Examination 2022 Secondary 4 Express CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY 6092/01 Paper 1 Select a time zone. 13 September 2022 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write your name, class and index number on all the work you hand in. Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid/tape. 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 Multiple Choice Answer Sheet. 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 Periodic Table is printed on page 18. The use of an approved scientific calculator is expected, where appropriate. DO NOT TURN THE PAGE UNTIL YOU ARE TOLD TO DO SO. This document consists of 18 printed pages. NORTHBROOKS ���

2 1 Ethanol and ethanoic acid can react to give ethyl ethanoate using the set-up below. What is the function of the condenser in this set-up? A To separate ethyl ethanoate from the ethanol and ethanoic acid B To lower the temperature to prevent decomposition of ethyl ethanoate C To reduce the chances of the ethanol escaping from the reaction mixture D To allow the ethanol to react with the oxygen in the air 2 An unknown sample, P, was tested using paper chromatography, together with three pigments, Q, R and S, using both water and ethanol as solvents. using water using ethanol Which of the three pigments, Q, R or S, is P likely to be? A Q only B S only C R and S only D Q, R and S condenser water ethanol and ethanoic acid heat P Q R S P Q R S ���

3 3 A solid is thought to be pure hexanoic acid. Which is the best way to test its purity? A conduct paper chromatography B determine its melting point C measure its pH D weigh it, burn it in oxygen, then weigh the products 4 Which of the following consists of an element, a compound and a mixture in the correct order? A air, diamond, water B helium, argon, sodium chloride C limestone, zinc, lead D sodium, carbon dioxide, salt water 5 Which statement about an atom is correct? A Each element always has the same number of electrons and neutrons. B Each element always has the same number of protons and neutrons. C The nucleon number can be equal to the proton number. D The nucleon number can be lesser than the number of electrons. 6 Antimony oxide has the formula Sb2O3 while potassium phosphate has the formula K3PO4. What is the formula of antimony phosphate? A SbPO4 B Sb2PO4 C Sb2(PO4)3 D Sb3PO4 ���

4 7 The structures of three substances P, Q and R are shown below. P Q R Which statements are correct? 1 P and R can conduct electricity in the molten state. 2 P and R are compounds while Q is an element. 3 P and R have giant structures while Q has a simple structure. A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3 8 In the molecules CH3OH, NH 3 and HF, which atoms use all of their outer shell electrons in bonding? A C and H B C and F C N and H D H and O 9 Which sulfide shows the greatest mass of sulfur in a 6 g sample? A Ag2S B FeS2 C PbS D SeS2 ���

5 10 Part of the Periodic Table is shown below. 1 Elements W, X and Y have high melting points. 2 Y is less reactive than W. 3 Z can form both ionic and covalent compounds. 4 X and Y form compounds that are coloured. Which of the following statements are correct? A 2 and 3 only B 1, 2 and 3 C 1, 2 and 4 D 2, 3 and 4 11 The bar chart shows the period of elements from lithium to neon. What information can be found from this bar chart? A the mass number B the proton number C the number of electrons used in bonding D the number of shells which contain electrons property Li Be B C N O F Ne element Y ���

6 12 Two substances, X and Y are mixed and heated. The damp Universal Indicator paper turns blue during the experiment. What are substances X and Y? A barium hydroxide and ammonium chloride B barium hydroxide and hydrochloric acid C hydrochloric acid and ammonium nitrate D hydrochloric acid and barium nitrate 13 Two solutions were mixed in a beaker and the mass of the beaker and contents was then recorded at various times. The graph below shows the results. What could be the two solutions? A aqueous copper(II) sulfate and aqueous ammonia B aqueous copper(II) sulfate and dilute hydrochloric acid C aqueous sodium hydroxide and zinc sulfate D aqueous sodium carbonate and dilute nitric acid damp Universal Indicator paper substances X and Y heat mass of beaker and contents time ���

7 14 The graph below shows the colour ranges of the acid -base indicators , methyl orange, bromothymol blue and phenolphthalein. A solution, when placed in the three indicators separately, is yellow in methyl orange, blue in bromothymol blue and colourless in phenolphthalein. What is the pH range of the solution? A 2.5 to 3.5 B 4.5 to 5.5 C 7.5 to 8.5 D 9.5 to 10.5 15 The table shows the solubility of some lead salts in water. salt solubility in water PbCl2 PbCO3, PbSO4 slightly soluble in cold water, soluble in hot water insoluble What will be the best method for making a sample of lead(II) chloride? A Add dilute hydrochloric acid to aqueous lead(II) nitrate, filter. B Heat lead(II) sulfate with dilute hydrochloric acid, cool, filter. C Heat excess powdered lead with hydrochloric acid, cool, filter. D Shake excess lead(II) carbonate with cold dilute hydrochloric acid, filter. methyl orange bromothymol blue phenolphthalein 1 2 3 4 5 6 7 8 9 10 11 12 13 pH red yellow yellow blue colourless magenta ���

8 16 Which of the diagrams shows the structure of an alloy? 17 W, X, Y and Z are four metals which form cations W+, X2+, Y+ and Z2+. The following are information on some of the reactions that the metals undergo. X2+ (aq) + W (s) → no reaction Z2+ (aq) + 2W (s) → 2W+ (aq) + Z (s) heat Y2CO3 (s) → no reaction heat X2CO3 (s) → XO (s) + CO2 (g) What is the order of decreasing reactivity of the metals? A X, W, Z, Y B X, Y, Z, W C Y, X, W, Z D Z, W, X, Y A