RGSHW Year 12 REDOX

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

Nuclear energy

8

7

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

5

7

4

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

Draggable item		Corresponding Item
CaO		2+
O₂		2-
NO₂

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 item		Corresponding Item
Ca(NO₃)₂		2+
Ca(NO₃)₂		5+
Ca(NO₃)₂		2-

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

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

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

	-1	0	+1
H₂
H₂O
NaH
H₂O₂
CH₄

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

RGSHW Year 12 REDOX

Nuclear energy

What is the oxidation number of Al?

What is the oxidation number of oxygen in O₂ ?

What is the oxidation number of iodine in I₂ ?

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

Mg + 2HCl → Mg Cl₂ + H₂

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

Nuclear energy

What is the oxidation number of Br?

What is the oxidation number of Sulfur ?

What is the oxidation number of Al?

What is the oxidation number of oxygen in O₂ ?

What is the oxidation number of iodine in I₂ ?

What is the oxidation number of Nitrogen

What is the oxidation number of hydrogen?

What is the oxidation number of oxygen?

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

Mg + 2HCl → Mg Cl₂ + H₂

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