Redox

Question 1

What is a redox reaction?

Answer 1

involves both reduction and oxidation

Question 2

What is oxidation?

Answer 2

the process if LOSING electrons

Question 3

what is reduction?

Answer 3

the process of GAINING electrons

Question 4

what js an oxidising agent?

Answer 4

an electron ACCEPTOR

Question 5

What is a reducing agent?

Answer 5

an electron donor

Question 6

What is the oxidation number for an uncombined element

Answer 6

ZERO

Question 7

What is the oxidation number of hydrogen in compounds?

Answer 7

+1

in metal hydrides (NaH) its -1

Question 8

What does an increace/decrease in oxidation state mean?

Answer 8

increase in state = oxidation
decrease in state = reduction

Question 9

How do you write a half equation

Answer 9

• write formula and balance
• balance oxygen atoms using water
• balance hydrogen atoms using H+
• balance charge by adding an electron to one side
• check charge/atoms are balanced

Question 10

What does the side of the e- show in a half equation?

Answer 10

If the e- is on the right = oxidation
if the e- is on the left = reduction