2021_RVHS_Prelim_P1_Ans

River Valley High School 8873/01/PRELIMS/21 2021 Preliminary Examination [Turn over RIVER VALLEY HIGH SCHOOL JC 2 PRELIMINARY EXAMINATION CANDIDATE NAME CLASS 2 0 J CENTRE NUMBER S INDEX NUMBER H1 CHEMISTRY 8873/01 Paper 1 Multiple Choice 23 Sep 2021 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class, centre number and index number on the Answer Sheet in the spaces provided. 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. The use of an approved scientific calculator is expected, where appropriate. This document consists of 14 printed pages.

2 River Valley High School 8873/01/PRELIMS/21 2021 Preliminary Examination 1 When potassium chlorate( V) KC lO3, is heated at its melting point, it disproportionates to potassium chlorate(VII) KClO4, and potassium chloride. What is the maximum number of moles of potassium chlorate( VII) which could be produced from 0.200 mol of potassium chlorate(V)? A 0.200 B 0.150 C 0.100 D 0.0500 2 Methane was burned in an incorrectly adjusted Bunsen burner. The methane was converted into a mixture of carbon dioxide and carbon monoxide in the ratio 99:1, together with water vapour. What will be the volume of oxygen consumed when y dm3 of methane is burned? A 3( 2y 0.01y ) dm B 30.01y( 2y ) dm2 C 30.01y( y ) dm2 D 3( y 0.01y ) dm 3 Use of the Data Booklet is relevant to this question. Iron in the form of magnetite, Fe 3O4, is extracted from ores in iron mines. The ore contains 69.9% by mass of iron. What percentage of the ore contains Fe3O4 by mass, if it is the only iron-containing component present? A 3.40% B 69.9% C 96.6% D 100%

3 River Valley High School 8873/01/PRELIMS/21 2021 Preliminary Examination [Turn over 4 Use of the Data Booklet is relevant to this question. The table shows the fifth, sixth, seventh, eighth and ninth ionisation energies of three elements in the third period. Ionisation energy/ kJ mol‒1 5th 6th 7th 8th 9th Element A 6274 21267 25431 29872 35905 Element B 7004 8496 27107 31719 36621 Element D 6542 9362 11018 33604 38600 Which statements are correct? 1 The first ionisation energy of A is lower than that of B. 2 The atom of element A will be isoelectronic with D2+. 3 A and D forms an ionic solid AD3. A 1 and 3 only B 2 and 3 only C 1 only D 2 only 5 In which order are the electrons los