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 phos