NJC_Prelim_P1

NATIONAL JUNIOR COLLEGE PRELIMINARY EXAMINATIONS Higher 1 CANDIDATE NAME SUBJECT CLASS REGISTRATION NUMBER CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 8872/01 22 September 2009 50 minutes READ THE INSTRUCTION FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, Centre number and index number on the Answer Sheet in the spaces provided unless this has been done for you. There are thirty 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 booklet. This question paper consists of 11 printed pages (including this page).

2 Section A For each qu estion there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1. MnO2 can react with concentrated hydrochloric acid to give chlorine gas as shown by the following equation. MnO2 + 4 HCl  MnCl2 + Cl2 + 2 H2O Given that 1 mole of gas occupies 24 dm 3 at room temperature, calculate the volume of 6 mol dm3 HCl required to generate 500 cm3 of chlorine gas. A 3.50 cm3 C 13.90 cm3 B 8.00 cm3 D 125.00 cm3 2. Which of the following has more protons than electrons and more neutrons than protons? A H 3O+ C Na+ B OH D F 3. The following shows how two ions are deflected in an electric field. Which of the following could be x? A 6Li+ C 27Al3+ B 10B+ D 23Na+ Negative plate  x 16O2 Source Positive plate + [Turn Over

3 4. The number of ions in 10 cm 3 of 0.200 mol dm 3 aqueous calcium chloride is the same as A The number of atoms in 0.426 g of chlorine gas. B The number of protons in 0.041 g of lithium metal. C The number of neutrons in 0.0116 g of aluminium metal. D The number of hydrogen atoms in 0.192 g of methane gas. 5. Ethanamide, CH 3CONH2 was boiled with 100 cm 3 of 1.0 mol dm 3 aqueous NaOH and the NH 3 evolved was passed into 30.00 cm 3 of 1.0 mol dm 3 HCl. The excess acid required 18.25 cm 3 of 0.1 mol dm 3 aqueous NaOH solution for neutralization. Given that ethanamide reacts with NaOH in the following equation. CH3CONH2 + NaOH  CH3COONa + NH3 Calculate the mass of ethanamide used in the reaction. (Mr of CH3CONH2 = 59.0) A 1.66 g C 4.13 g B 3.05 g D 5.90 g 6. Which of the following shows the correct order of the four elements in increasing ionisation energies? A Ga, K, Ca, Ar C K, Ga, Ca, Ar B Ar, K, Ca, Ga D K, Ca, Ga, Ar 7. Which statement about the properties associated with ionic and covalent substances is correct? A Ionic bonds and cova