✅3 - Redox I

Question 1

What is a redox reaction?

Answer 1

One which involved reduction and oxidation

Question 2

What is an oxoanion?

Answer 2

An ion with oxygen within it, formed by both metals and non metals

Question 3

What is a half equation?

Answer 3

An ionic equation used to describe either the loss or gain of electrons during a redox reaction

Question 4

What are displacement reactions?

Answer 4

Redox reactions which can be used to compare the relative strengths of metals as reducing agents and non-metals as oxidising agents.

Question 5

What are spectator ions?

Answer 5

Ions which are present in solution but take no part in the reaction

Question 6

If the oxidation number gets more positive the compound has been…

Answer 6

…oxidised

Question 7

If the oxidation number of a compound decreases, it has been…

Answer 7

…reduced

Question 8

The oxidation of all uncombined elements is…

Answer 8

…zero

Question 9

If an ion is made of one element, the oxidation number is…

Answer 9

… the charge on the ion

Question 10

The sum of the oxidation numbers in a neutral compound is…

Answer 10

…zero

Question 11

The sum of oxidation numbers or an ion is…

Answer 11

…the charge on the ion

Question 12

What are the oxidation numbers for group 1 elements?

Answer 12

+1

Question 13

What happens to oxidising agents?

Answer 13

They oxidise other species while themselves being reduced

Question 14

What happens to reducing agents?

Answer 14

They reduce other species while themselves being oxidised

Question 15

What happens to metals when they form compounds?

Answer 15

They generally donate electrons to form positive ions

Question 16

What happens to non-metals when they form compounds?

Answer 16

They generally gain electrons to form negative ions

Question 17

What can be used to balance half equations?

Answer 17

H+, H2O and e-

Question 18

Why would you use H2O to balance a half equation?

Answer 18

If there were more Oxygen on one side unaccounted for, or more Hydrogen

Question 19

How can you balance charges in half equations?

Answer 19

By adding electrons to the more positive side

Question 20

When would you use H+ to balance a half equation?

Answer 20

To balance the hydrogen after water has been added

Question 21

When combining half equations, what should you make sure?

Answer 21

That the number of electrons in each are the same, multiplying them if need be