
Metals and their Extractions
Presentation
•
Science
•
9th Grade
•
Medium
Standards-aligned
Karen Cymru
Used 1+ times
FREE Resource
8 Slides • 17 Questions
1
Multiple Choice
2
3
Multiple Choice
Why is the reactivity series important in the extraction of metals from their ores?
It helps determine the method used for extraction
It shows the color of metals
It predicts the melting point of metals
It tells us the cost of extraction
4
Multiple Choice
Arrange the metals W, X, Y and Z in increasing order of reactivity.
X, W, Y, Z
X, Y, W, Z
Z, Y, W, X
W, Z, Y, X
5
6
Multiple Choice
7
Multiple Choice
8
9
Multiple Choice
10
Multiple Choice
Which of the following statements best explains why aluminium is extracted by electrolysis rather than by reduction with carbon?
Aluminium is less reactive than carbon
Aluminium is more reactive than carbon
Aluminium forms alloys with carbon
Aluminium cannot conduct electricity
11
12
Multiple Choice
13
Multiple Choice
14
15
Open Ended
Explain why the positive electrode in the industrial electrolysis of aluminium needs to be replaced often.
16
Multiple Select
Diagram shows the electrolysis of concentrated copper(II) chloride solution using carbon as electrodes.
Which of the followings is the correct half equations represents the reactions at the anode?
4OH- → 2H2O + O2 + 4e
2Cl- → Cl2 + 2e
Cu → Cu2+ + 2e
Cu2+ + 2e → Cu
17
Fill in the Blanks
Aluminium oxide is dissolved in
18
Multiple Select
Which of the following are correct statements about the products formed at the electrodes during the electrolysis of molten lead bromide?
Lead forms at the cathode
Bromine forms at the anode
Lead forms at the anode
Bromine forms at the cathode
19
20
21
Multiple Choice
Which property is shared by most transition metals?
Low melting points
Form coloured compounds
Poor conductors of electricity
Very reactive
22
23
Multiple Choice
Pb + 2Ag+ → Pb+2 + 2Ag
The chemical species being reduced is
Ag
Pb
Pb+2
Ag+
24
Fill in the Blanks
In the blast furnace extraction of iron, limestone undergoes thermal decomposition to form
25
Multiple Choice
In a redox reaction, the species that loses electrons
is called the cathode
is oxidized
gains mass at the electrode
decreases in oxidation number
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