Page 41 - Ranger SPM 2022 Chemistry

Chemistry SPM Answers
(e) 24 Mg – 79%, 4. Place one container filled with seawater
12
under the tilted mirror.
25 Mg – 10%,
12 5. Place another empty container at the
26 Mg – 11% lower end of the mirror.
12 6. Cover the whole set-up with the plastic
(f) Relative atomic mass of magnesium bag and wait until water evaporates and
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[(24 × 79) + (25 × 10) + (26 × 11)] condenses to form water droplets.
= 100 (c) (i) Uranium-235
= 24.32 (ii) Positive effects:
• Nuclear power stations do not
24.32
(g) = 2.02 contribute to greenhouse effect.
12
• A small amount of nuclear material
Section B can generate a large amount of
2. (a) • Water molecules receive heat from the energy.
surroundings. Negative effects:
• Water molecules at the surface of water • Radioactive waste can cause serious
have higher kinetic energy. health problems.
• Water molecules move faster and thus • Uranium is a non-renewable resource.
weaken the attraction force between the (iii) Medicine
molecules. • Cobalt-60: To kill cancer cells
• Therefore, water evaporates to the • Iodine-131: To treat thyroid cancer
surroundings. • Sodium-24: To study blood flow
(b) 1. Cut the mineral bottle into half to make Archaeology
two containers. • Carbon-14: Radiocarbon dating
2. Collect branches as a stand for the mirror. • Lead-210: To determine the age of
3. Place the mirror tilted over the branches. sand
Section C
3. (a) Name of process: Evaporation
State of matter State X State Y

Diagram of the
arrangement of particles

Closely packed but not in orderly
Arrangement of particles Closely packed in orderly manner
manner
Movement of particles Vibrate and rotate in a fixed position Vibrate, rotate and move freely
Have higher kinetic energy
Amount of kinetic energy Have very low kinetic energy
compared to state X
Attraction force between Have very strong attraction force Have weaker attraction force
particles compared to state X

(b) Field Isotope Function
Agriculture Phosphorus-32 To study the metabolism of plants

Archaeology Carbon-14 To determine the age of artifacts and fossils
Medicine Cobalt-60 To treat cancer

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ANS RANGER SPM CHEMISTRY 2P.indd 236 29/03/2022 2:55 PM