Page 33 - Ranger PT3 2022 science

Science PT3 Chapter 4 Reactivity of Metals

(a) The results of this activity are as follows:
Mixture Observation Inference
Penerbitan Pelangi Sdn Bhd. All Rights Reserved.
Zinc oxide and Mixture glows slowly Carbon is more reactive
carbon than zink
Aluminium oxide and No changes Carbon is less reactive
carbon than aluminium
Lead(II) oxide and Mixture glows Carbon is more reactive
carbon than lead
(b) Based on the reactivity reaction, the sequence of reactivity is as follows:
Aluminium, Carbon, Zinc, Lead
Decreasing reactivity
(c) Metals placed below carbon or are less reactive in the reactivity series
can be extracted from their ore by heating up the ore with carbon.
(d) Metals placed above carbon or are more reactive than carbon can be
extracted through the electrolysis process.

Position of Hydrogen in the Reactivity Series of Metals
1. The position of hydrogen in the reactivity series of metals can be
determined through data interpretation based on the following activity.
Combustion of
excess hydrogen gas
Thistle funnel
Metal oxide
on porcelain
dish

Heat
Dilute sulphuric acid
+ copper(II) sulphate
solution Zinc
Anhydrous
calcium
chloride
Diagram 4.5
(a) The results of this activity are as follows:
Mixture Observation Inference
Hydrogen + Aluminium oxide does not glow. Hydrogen does not
aluminium Aluminium oxide is white in colour. reduce aluminium oxide.
oxide
Hydrogen + Zink oxide does not glow. Zinc oxide Hydrogen does not Form 3
zinc oxide changes colour to yellow when it is reduce zinc oxide.
hot and is white on cooling.
Form 3

273

04 Ranger Science Ting.3.indd 273 30/03/2022 2:22 PM