
6092 Chapter 12 Redox 5 Change in Oxidation State

Quiz
•
Chemistry
•
9th - 12th Grade
•
Easy
Choo Qian
Used 1+ times
FREE Resource
12 questions
Show all answers
1.
DROPDOWN QUESTION
20 sec • 1 pt
The term oxidation can be used to describe a reaction in which a reactant loses electrons to form a substance (product). When the reactant loses electrons, its oxidation state (a) . The reactant is said to be (b) .
2.
DROPDOWN QUESTION
20 sec • 1 pt
Reduction is the reverse of oxidation. The term reduction can be used to describe a reaction in which a reactant gains electrons to form a substance (product). When the reactant gains electrons, its oxidation state (a) . The reactant is said to be (b) .
3.
DROPDOWN QUESTION
30 sec • 1 pt
When heated copper reacts with oxygen, copper(II) oxide is produced.
2Cu(s) + O2(g) → 2CuO(s)
oxidation state of Cu in Cu is (a)
Oxidation state of Cu in CuO is (b)
4.
DROPDOWN QUESTION
30 sec • 1 pt
When heated copper reacts with oxygen, copper(II) oxide is produced.
2Cu(s) + O2(g) → 2CuO(s)
oxidation state of O in O2 is (a)
Oxidation state of O in CuO is (b)
5.
FILL IN THE BLANK QUESTION
30 sec • 1 pt
When heated copper reacts with oxygen, copper(II) oxide is produced.
2Cu(s) + O2(g) → 2CuO(s)
In term of oxidation state, which substance is oxidised?
6.
FILL IN THE BLANK QUESTION
30 sec • 1 pt
When heated copper reacts with oxygen, copper(II) oxide is produced.
2Cu(s) + O2(g) → 2CuO(s)
In term of oxidation state, which substance is reduced?
7.
OPEN ENDED QUESTION
3 mins • 1 pt
When heated copper reacts with oxygen, copper(II) oxide is produced.
2Cu(s) + O2(g) → 2CuO(s)
Explain, in terms of oxidation states, why the reaction between copper and oxygen is a redox reaction.
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Answer explanation
The oxidation state of copper increases from 0 in copper metal (Cu) to +2 in copper(II) oxide (CuO). Copper metal (Cu) is oxidised. OR Copper metal undergoes oxidation.
The oxidation state of oxygen decreases from 0 in oxygen gas (O2) to -2 in copper(II) oxide (CuO). Oxygen gas (O2) is reduced. OR Oxygen gas (O2) undergoes reduction.
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