Physical - 1.7 REDOX

Question 1

What happens in an oxidation reaction?

Answer 1

• Gain of oxygen
• Loss of hydrogen
• Loss of electrons

Question 2

What happens in a reduction reaction?

Answer 2

• Loss of oxygen
• Gain of hydrogen
• Gain of electrons

Question 3

What is an oxidation state?

Answer 3

The charge on an atom assuming that the bonding is completely ionic

Question 4

What was the total sum of oxidation states be in a compound?

Answer 4

Zero

Question 5

What was the total sum of oxidation states be in an ion?

Answer 5

The charge of the ion

Question 6

What is the maximum oxidation state of an ion?

Answer 6

Plus the group number

Question 7

What is the minimum oxidation state of an ion?

Answer 7

The group number take away 8

Question 8

How is the oxidation state of ions calculated?

Answer 8

The oxidation state of a simple ion is the charge on the ion

Question 9

What is the oxidation state of oxygen?

Answer 9

-2
Except peroxides = -1
Except OF2 = -1

Question 10

What is the oxidation state of hydrogen?

Answer 10

+1
Except hydrides = -1

Question 11

What is an oxidising agent?

Answer 11

Except electrons and is itself reduced

Question 12

What is a reducing agent?

Answer 12

Loses electrons and is itself oxidised

Question 13

Where are the electrons on a reduction half equation?

Answer 13

On the left

Question 14

Where are the electrons on an oxidation half equation?

Answer 14

On the right

Question 15

What are the steps of writing half equation?

Answer 15

• Add water to balance oxygen
• Add H+ to balance hydrogen
• Add electrons to balance the charge

Question 16

What are the steps when combining half equation?

Answer 16

• Ensure there is oxidation and reduction half equation
• Multiply either of the equations to make sure they are the same number of electrons
• Combine the two half equations
• Cancel the electrons