Page 8 - 1202 Question Bank Chemistry Form 4 KSSM

52. Phosphorus-31 and phosphorus-32 are isotopes. 54. A food technologist intends to destroy bacteria
SPM
SPM Which statement is correct? HOTS Applying SPM by treating the food with radiation. Which of the
SPM
CLONE CLONE
[Proton number of phosphorus = 15] following is suitable to be used?
A Phosphorus-31 has 15 protons and 16 electrons A Lead-210 C Carbon-14
B Phosphorus-32 has 15 electrons and B Cobalt-60 D Hydrogen-3
17 neutrons
C Phosphorus-31 has a smaller number of electrons 55. Diagram 23 shows a person suffering from a disease.
than phosphorus-32 SPM
SPM
D Phosphorus-31 has the same number of neutrons as CLONE
phosphorus-32
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53. Diagram 22 shows the symbol used to label the food
SPM
SPM that is irradiated with isotope Q.
CLONE

Diagram 23
Which of the following is suitable to treat the disease?
A Cobalt-60
Diagram 22 B Iodine-131
What is isotope Q? C Sodium-24
A carbon-14 C phosphorus-32 D Magnesium-24
B sodium-24 D cobalt-60

PAPER 2

Section A
Answer all questions.

1. Water has the formula of H O. Diagram 1 shows the arrangement of water particles in three states of matter X, Y and
2
SPM Z.
SPM
CLONE

X Y Z
Diagram 1
(a) What are the physical states labelled X, Y, and Z? [3 marks]
X : Y : Z :

(b) What type of particle is found in water? [1 mark]

(c) State the melting point of pure water. [1 mark]

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Question 55: Question 1:
Cobalt-60 is usually used to treat cancer but iodine-131 is specifically used to (b) Types of particles refer to atom, molecule or ion.
thyroid cancer. (c) Melting point = freezing point. Freezing point of pure water is 0ºC SOS TIP
and boiling point of pure water is 100ºC.
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