Page 38 - Ranger PT3 2022 science

Science PT3 Answers
(b) (i) To activate it 11. (a) (i) The liquid is odourless / colourless
(ii) Magnesium powder burnt with white (ii) Test the liquid using universal
flame indicator. The green colour of the
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Magnesium is a reactive metal universal indicator will remain if the
liquid is water because water is
(iii) Magnesium oxide neutral.
(iv) Magnesium + Oxygen → Magnesium (b) Tool A. Water consumption can be
oxide
controlled by filling the amount of water
10. (a) (i) Force and displacement needed in the watering can. Watering can
(ii) Work = Force × Displacement is also used to catch rain which can be
= 200 N × 2 m used to water the plants. Thus, the water
= 400 Joule consumption can be reduced.
(iii) Aiman = 400 Joule / 60 s (c)
= 6.7 Watt Ice
Rosli = 400 Joule / 40 s Cover
= 10 Watt
The power possessed by Rosli is Bowl
greater compare to Aiman. Pipe water
(b) A – Elastic potential energy Grill rack
B – Gravitational potential energy
(c) Potential energy A is an energy stored as Pot
a result of deformation of an elastic object
as it is compressed or stretched. Potential
energy B is the energy stored in the object
because of its higher position from the The pipe water is heated until it boils and
ground. produces steam.
(d) (i) Flexible pole can produce elastic Steam rises and hits the cover cooled by
potential energy to propel the athlete. ice. The process of condensation occurs
(ii) Point D because its position is the and the steam turns into water. Water
highest droplets will fall into the bowl, and these
water droplets are distilled water.

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00 ANSWER.indd 344 25/03/2022 3:12 PM