Unit 3 redox reactions

Question 1

reduction

Answer 1

gaining electrons

Question 2

oxidation

Answer 2

losing electrons

Question 3

redox reactions

Answer 3

Electrons are transferred from one atom to another

Question 4

metals are

Answer 4

oxidized

Question 5

non-metals are

Answer 5

Reduced

Question 6

in a neutral compound the sum of the oxidation number is

Answer 6

zero

Question 7

in polyatomic ions the sum of the oxidation number is

Answer 7

the charge of the polyatomic ion

Question 8

when an element gains electrons the charge goes

Answer 8

down

Question 9

when an element loses electrons the charge goes

Answer 9

up

Question 10

rules for Redox Reactions

Answer 10

1) the oxidation number of an uncombined atom is zero (diatomic ions)
2) the oxidation number of a combined atom in an Ionic Compound is equal to the charge of the ion
3) the oxidation number for the hydrogens is +1
4) the oxidation number for oxygen is always -2 (unless its in peroxcides, then its -1)

Question 11

in molecules there are no

Answer 11

charges

Question 12

what does “OIL” in “OIL RIG” mean

Answer 12

Oxidation Is Losing (elecrtons)

charge goes up

Question 13

“RIG” in “OIL RIG” means

Answer 13

Reduction Is Gaining (electrons)

charge goes down

Question 14

in Redox Reactions the charges

Answer 14

balance in the same way as they do for any other reaction