2022 Presbyterian High Chemistry P1 (Answers)

[Turn over Name: ...................................... Register/Index Number: ............... Class: .............. PRESBYTERIAN HIGH SCHOOL SCIENCE (CHEMISTRY) 5076/1, 5078/1 Paper 1 24 August 2022 Wednesday 1 hour PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL 2022 SECONDARY FOUR EXPRESS / FIVE NORMAL (ACADEMIC) PRELIMINARY EXAMINATION INSTRUCTIONS TO CANDIDATES Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and register number on the Answer Sheet in the spaces provided. There are twenty questions in 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. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. A copy of the Periodic Table is printed on page 8. Setter: Mr Muhammad Faeez Vetted by: Ms Chan Poh Hoon This question paper consists of 8 printed pages.

2 [Turn over 1 Which of the following substances may be condensed using a water-cooled condenser? melting point/ ˚C boiling point/ ˚C A -135 -0.5 B -130 +36 C -115 -85 D -78 -33 2 A student takes 1 g sample of calcium carbonate and adds them to 10 cm3 sample of dilute hydrochloric acid at different temperatures. She measures how long it takes for the effervescence to stop. Which apparatus does she use? balance clock filter funnel measuring cylinder thermometer A ✓ ✓ ✓ ✓ X B ✓ ✓ X ✓ ✓ C ✓ X ✓ ✓ ✓ D X ✓ ✓ X ✓ 3 The electronic configuration of an ion is 2.8.8. What could this ion be? P3- K+ A ✓ ✓ B ✓ X C X ✓ D X X 4 Which diagram shows a mixture of compounds? A B C D

3 [Turn over 5 Nitrogen is heated in a balloon, which expands slightly. Which statements about the molecules of nitrogen are correct? 1 They move further apart. 2 They move more quickly. 3 They remain the same distance apart. 4 Their speed remains unchanged. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4 6 The bonding in a molecule of carbon dioxide can be represented by a dot -and-cross diagram. Which diagram is correct? 7 Which relative molecular mass, Mr, is not correct for the molecule given? molecule Mr A ammonia, NH3 17 B carbon dioxide, CO2 44 C methane, CH4 16 D ox