3.1.7 Oxidation, Reduction and Redox Equations

Question 1

What is oxidation?

Answer 1

• Loss of electrons
• Gain of oxygen
• (Loss of hydrogen)

Question 2

What is reduction?

Answer 2

• Gain of electrons
• Loss of oxygen
• (Gain of hydrogen)

Question 3

What is does an oxidising agent do?

Answer 3

Accepts electrons and gets reduced

Question 4

What is does a reducing agent do?

Answer 4

Donates electrons and gets oxidised

Question 5

What is a redox reaction?

Answer 5

When reduction and oxidation happen simultaneously

Question 6

What do oxidation states tell you?

Answer 6

Charge on an ion or element or atom

(Tells you total number of electrons element/compound has donated or accepted)

Question 7

____ ______ show Oxidation States

Answer 7

Roman numerals

Question 8

What is the oxidation state for uncombined elements (e.g. He)?

Answer 8

0

Question 9

What is the oxidation state for elements bonded to identical atoms (e.g. O₂, H₂)?

Answer 9

0

Question 10

What is the oxidation state for a simple monatomic ion (Na⁺)?

Answer 10

Same as its charge (e.g +1)

Question 11

What is the overall oxidation state for compound ions?

Answer 11

The ion charge

Question 12

What is the sum of oxidation states for a neutral compound?

Answer 12

0

Question 13

What is the oxidation state for oxygen? & list the expections

Answer 13

• -2 oxidation state in its compounds
• Expect in peroxides (compounds with the structure R−O−O−R) = -1
• & fluorides = +2

Question 14

What is the oxidation state for hydrogen? & list the expections

Answer 14

• +1 oxidation state in its compounds
• Expect in metal hydrides (hydrogen compounds bonded to metal) = -1

Question 15

State the oxidation state of O in H₂O

Answer 15

-2

Question 16

State the oxidation state of O in H₂O₂

Answer 16

-1

Question 17

State the oxidation state of H in HF

Answer 17

+1

Question 18

State the oxidation state of H in NaH

Answer 18

-1

Question 19

What is the oxidation state for fluorine?

Answer 19

-1

Question 20

What is the oxidation state for aluminium?

Answer 20

+3

Question 21

What is the oxidation state for carbon?

Answer 21

±4

Question 22

Transition metals have a _____ ____ up to _

Answer 22

postive charge up to 7

Question 23

State the oxidation state of Cl in Cl₂O₇

Answer 23

+7

Question 24

State the oxidation state of Mn and O in MnO₄^2-

Answer 24

Mn = +6 & O = -2

Question 25

Write the equation for an oxidation reaction

Answer 25

Reductant → product + e^-

Question 26

Write the equation for an reduction reaction

Answer 26

Oxidant + e^- → product

Question 27

In oxidation, the oxidation number _____

Answer 27

increases (electrons lost)

Question 28

In reduction, the oxidation number _____

Answer 28

decreases (electrons gained)

Question 29

Write the half equation for VO²⁺ → VO₂⁺

Answer 29

VO²⁺ + H₂O → VO₂⁺ + e^- + 2 H⁺

Question 30

Write the half equation for BrO₃^- → Br₂

Answer 30

2 BrO₃^- + 10 e^- + 12 H⁺ → Br₂ + 6 H₂O

Question 31

Combine these half equations

MnO^-₄ + 8 H⁺ + 5 e^- → Mn²⁺ + 4 H₂O

2Cl^- → Cl₂ + 2 e^-

Answer 31

2 MnO^-₄ + 16 H⁺ + 10 Cl^- → 2 Mn²⁺ + 8 H₂O + 5 Cl₂

Question 32

Combine these half equations

H₂O₂ → 2 H⁺ + O₂ + 2 e^-

MnO₄^- + 8 H⁺ + 5 e^- → Mn²⁺ + 4 H₂O

Answer 32

5 H₂O₂ + 2 MnO₄^- + 6 H⁺ → 2 Mn²⁺ + 8 H₂O + 5 O₂

Question 33

Write the full equation for.

Answer 33

Question 34

Write the full equation for

Answer 34