4.3 Redox

Question 1

What is the acronym for remembering oxidation and reduction?

Answer 1

OIL RIG

Question 2

What does OIL RIG stand for?

Answer 2

Oxygen Is Loss, Reduction Is Gain

Question 3

What is the oxidation state for an uncombined element (eg. Cl2, O2, Fe)?

Answer 3

0

Question 4

What is the oxidation state for an ion?

Answer 4

The charge of the ion

Question 5

What is the oxidation state for a group 1 element?

Answer 5

+1

Question 6

What is the oxidation state for a group 2 element?

Answer 6

+2

Question 7

What is the oxidation state for chlorine?

Answer 7

-1

Question 8

What are the exceptions for oxidation state of chlorine and why?

Answer 8

If bonded to F or O chlorine state is not -1, as F and O are more electronegative than chlorine

Question 9

What is the oxidation state for aluminium?

Answer 9

+3

Question 10

What is the oxidation state for hydrogen?

Answer 10

+1

Question 11

What are the exceptions for oxidation state of hydrogen?

Answer 11

Hydrogen has an oxidation state of -1 in hydrides

Question 12

What is a hydride?

Answer 12

Hydrogen bonded to a metal

Question 13

What is the oxidation state for fluorine?

Answer 13

-1

Question 14

What is the oxidation state for oxygen?

Answer 14

-2

Question 15

What are the exceptions for oxidation state of oxygen?

Answer 15

-1 in peroxides (eg. H2O2), +2 when bonded to fluorine (eg. F2O)

Question 16

What is the oxidation state of Cl-?

Answer 16

-1

Question 17

What is the oxidation state of calcium in CaO?

Answer 17

+2

Question 18

What is the oxidation state of potassium in KCl?

Answer 18

+1

Question 19

What is the oxidation state of hydrgoen in HF?

Answer 19

+1

Question 20

What is the oxidation state of hydrgoen in NaH?

Answer 20

-1

Question 21

What is the oxidation state of oxygen in H2O?

Answer 21

-2

Question 22

What is the oxidation state of oxygen in H2O2?

Answer 22

-1

Question 23

What is the oxidation state of oxygen in F2O?

Answer 23

+2

Question 24

What is the oxidation states of transition metals?

Answer 24

Variable oxidation states

Question 25

What is the sum of oxidation numbers equal to?

Answer 25

The total charge

Question 26

What is the oxidation number of nitrogen in NO3-?

Answer 26

+5

Question 27

When are roman numerals used in naming?

Answer 27

When naming elements that form ions with different charges

Question 28

What do roman numerals show?

Answer 28

Oxidation state of an element

Question 29

What is a redox reaction?

Answer 29

A reaction involving oxidation and reduction

Question 30

What is the charge of NO3?

Answer 30

-1

Question 31

What is reduction in terms of electrons?

Answer 31

Gain of electrons

Question 32

What is oxidation in terms of electrons?

Answer 32

Loss of electrons

Question 33

What is reduction in terms of oxidation number?

Answer 33

Decrease in oxidation number

Question 34

What is oxidation in terms of oxidation number?

Answer 34

Increase in oxidation number

Question 35

What is formed when metals react with acids in a redox reaction?

Answer 35

Salt and hydrogen gas

Question 36

What is the equation for the reaction of sodium with sulfuric acid?

Answer 36

2Na + H2SO4 → NaSO4 + H2

Question 37

What is the equation for the reaction of calcium with hydrochloric acid?

Answer 37

Ca + 2HCl → CaCl2 + H2

Question 38

How do you write an oxidation number?

Answer 38

+/- sign, then the number