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SPM Chemistry A xplosive Module (Chemistry A Ticket For “U”) ANSWERS

ANSWER SCHEME
PAPER 1

No Topic Answer Explanation
Topik Jawapan Penerangan
1 The Structure of the Atom C Lead (II) bromide, PbBr 2 - Ion
Oxygen, O 2 – Molecule/ Molekul
Magnesium, Mg – Atom
Naphthalene, C 10H 8 – Molecule/ Molekul

2 The Structure of the Atom B The molar mass of a substance is the mass of one
mole of the substance in grams. It has a unit of grams
-1
per mole (gmol ). The molar mass of any substance
is numerically equal to its relative atomic, molecular
or formula mass.

Jisim molar sesuatu bahan ialah jisim satu mol
bahan tersebut dalam unit gram. Unit bagi jisim
-1
molar ialah gram per mol (gmol ). Nilai jisim molar
sesuatu bahan menyamai jisim atom relatif, jisim
molekul relatif atau jisim formula relatif bahan
tersebut.

3 The Structure of the Atom D Valence electrons are electrons found in the
outermost occupied shell of an atom. Atom in
Diagram 1 has 3 valence electrons.

Elektron valens adalah elektron yang didapati dalam
petala terisi elektron paling luar sesuatu atom. Atom
di dalam Rajah 1 mempunyai 3 elektron valens.

4 Chemical Formulae and C Balance chemical equation means that the numbers
Equations of atoms before and after a chemical reaction are the
same.

Persamaan kimia yang seimbang bermaksud
bilangan atom sebelum dan selepas tindak balas
kimia haruslah sama.

2 KMnO 4  K 2MnO 4 + MnO 2 + O 2
K= 2 atom; Mn=2 atom; O = 8 atom

5 Chemical Formulae and D X NO 3 X CO 3
Equations +3 -1 +3 -2
= X(NO 3) 3 = X 2(CO 3) 3

6 Chemical Formulae and B The empirical formula of a compound shows the
Equations simplest whole number ratio of atoms of each
element present in the compound.

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