NJC_H2_CHEM_P1 Prelim

NJC/H2 Chem/01/2011 [Turn over   1 NATIONAL JUNIOR COLLEGE PRELIMINARY EXAMINATIONS Higher 2 CANDIDATE NAME SUBJECT CLASS REGISTRATION NUMBER CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Data Booklet 9647/01 Fri 16 Sept 2011 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, subject class and registration number on the Answer Sheet in the spaces provided unless this has been done for you. There are 40 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 paper consists of 19 printed pages and 0 blank page.

NJC/H2 Chem/01/2011 [Turn over   2 Section A For each question, there are four possible answers labelled A, B, C and D. Choose the one you consider to be correct. 1 Use of the Data Booklet is relevant to this question. The bar chart gives some information about the first ionization energies of elements numbered 1 to 4. The elements are adjacent to each other in the Periodic Table with increasing proton number either across a period from left to right, or down a group. What could these four elements be? A B, C, N, O B Co, Ni, Cu, Zn C Mg, Ca, Sr, Ba D Na, Mg, A l, Si 2 The chloride ion, Cl–, has the same electronic structure as A F– B Ne C Na+ D Ca2+ 1st I.E 1 2 3 4

NJC/H2 Chem/01/2011 [Turn over   3 3 The table gives the successive ionization energies for an element A in Period 2. 1 st 2 nd 3 th 4 th 5 th 6 th Ionization energy / kJ mol–1 950 1800 2700 4800 6000 12300 What could be the formula of the chloride of A? A ACl B ACl2 C ACl3 D ACl5 4 A mixture of 15 cm 3 of oxygen and 50 cm 3 of hydrogen is sparked continuously. What is the maximum theoretical decrease in volume? (All g ases are recorded at room temperature and pressure.) A 65 cm3 B 45 cm3 C 25 cm3 D 15 cm3

NJC/H2 Chem/01/2011 [Turn over