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RGSHW Year 12 REDOX

Last updated 16 days ago
26 questions
2
Other Answer Choices:
Reduced
Oxidised
4
Other Answer Choices:
Reduction
Oxidation
3
Other Answer Choices:
Reduction
Oxidation
10
Classify the first column as oxidation or reduction.
The second column gives the reduction half equation for each change.
Other Answer Choices:
Reduction
2 e-
e-
3e-
Oxidation
1

1

Nuclear energy

8

What is the oxidation number of Br?

-2
-1
0
+1
+2
+3
+4
+5
Br₂
HBr
HBrO₃
HOBr
NaBr
KBr
MgBr₂
AlBr₃
7

What is the oxidation number of Sulfur ?

-2
0
+2
+4
+6
H₂S
S₈
SO₂
SO₃
H₂SO₄
Na₂SO₄
MgSO₄
1

What is the oxidation number of Al?

1

What is the oxidation number of oxygen in O₂ ?

1

What is the oxidation number of iodine in I₂ ?

10

What is the oxidation number of Nitrogen

-3
0
+2
+3
+4
+5
N₂
NaNO₃
NH₃
NO₃⁻
HNO₃
Mg(NO₃)₂
NH₄⁺
NO
NO₂
NO₂⁻
5

What is the oxidation number of hydrogen?

-1
0
+1
H₂
H₂O
NaH
H₂O₂
CH₄
7

What is the oxidation number of oxygen?

-2
-1
0
+1
+2
O₂
H₂O
H₂O₂
Na₂O
MgO
H₂SO₄
F₂O
4

2 Ca(NO₃)₂ → 2 CaO + 4 NO₂ + O₂ (thermal decomposition of calcium nitrate)

Draggable itemCorresponding Item
CaO
2+
NO₂
2-
CaO
4+
O₂
0
4
2 Ca(NO₃)₂ → 2 CaO + 4 NO₂ + O₂ (thermal decomposition of calcium nitrate)
Oxidation number of Ca in reactants = _______
Oxidation number of Ca in products = _______
Change in oxidation number = _______
Ca has _______ been oxidised or reduced
5
2 Ca(NO₃)₂ → 2 CaO + 4 NO₂ + O₂ (thermal decomposition of calcium nitrate)
Oxidation number of N in reactants = _______
Oxidation number of N in products = _______
Change in oxidation number = _______
O has been _______
so N has been _______ and acts as an _______ agent
7
2 Ca(NO₃)₂ → 2 CaO + 4 NO₂ + O₂ (thermal decomposition of calcium nitrate)

Oxidation number of O2- in Ca(NO₃)₂ = _______
Oxidation number of O2- in CaO = _______
Oxidation number of O2- in NO₂ = _______
Oxidation number of O in O₂ = _______
Change in oxidation number = _______
O2- has been _______
O2- has acted as a _______ agent
2
Fill in the oxidation numbers for magneisum (Reaction of magnesium with water).
Other Answer Choices:
+2
0
1
Fill in the oxidation numbers for hydrogen
Other Answer Choices:
+1
0
+2
5
Change in magnesium.
The magnesium has been _____________
The oxidation number has ______________ from _________ to _______
The magnesium has acted as a _____________ agent.
Mg → Mg²⁺ + 2e⁻ magnesium atoms have _________ electrons.
Other Answer Choices:
increased
zero
oxidised
reducing
lost
+2
6
Change in hydrogen in the reaction of magnesium with water

Oxidation number of H+ in water is _______
Oxidation number H in H2 is _________
The oxidation number has ______________ so the H+ has been ____________
The H+ has acted as an ______________agent.
2H⁺ + 2e⁻ → H₂ reduction is _________ of electrons.
Other Answer Choices:
zero
decreased
reduced
oxidising
gain
+1
6
Change in hydrogen in the reaction of magnesium with steam

Oxidation number of H+ in water is _______
Oxidation number of H+ in OH- is _______
Oxidation number H in H2 is _________
The oxidation number has ______________ so the H+ has been ____________
The H+ has acted as an ______________agent.
2H⁺ + 2e⁻ → H₂ reduction is _________ of electrons.
(note some H+ ions are neither oxidised or reduced).
Other Answer Choices:
oxidising
zero
+1
decreased
gain
reduced
4
Fill in the oxidation numbers
Other Answer Choices:
-1
+1
0
+2
6

Mg __________ + 2H__________Cl __________→ Mg __________Cl₂ __________+ H₂ __________

3

2 Ca(NO₃)₂ → 2 CaO + 4 NO₂ + O₂ (thermal decomposition of calcium nitrate)

Draggable itemCorresponding Item
Ca(NO₃)₂
2+
Ca(NO₃)₂
5+
Ca(NO₃)₂
2-