redox reactions

Question 1

where does the cell get energy from and how

Answer 1

From Nutrients a.k.a. “food”
Energy is captured by Oxidation and Reduction
reactions = called REDOX! =

Question 2

Electron donor:

Answer 2

loses electrons & becomes oxidized

Question 3

Electron acceptor:

Answer 3

gains electrons & becomes reduced

Question 4

Oxidation:

Answer 4

• loss of electrons by an atom
• & usually also gains O atoms
• &/or loses H.

Question 5

Reduction:

Answer 5

• gain of electrons by an atom
• usually also gains H atoms
• &/or loses O.

Question 6

reduced vs oxidized carbon forms

Answer 6

Methane CH4
- no bonds to oxygen, only hydrogen
- most reduced

glucose
- somewhat oxidized, somewhat reduced

CO2
- no hydrogen bones
- all CO bonds

Question 7

there is a ____ potential energy stored in reduced forms of carbon

Answer 7

high!

Question 8

how do cells use reduced forms of carbon

Answer 8

Cells use these reduced forms of carbon and harness the energy that is released in a series of chemical reactions.

Question 9

In the cell, reduced carbon such as glucose is oxidized to carbon dioxide to form products that are:

Answer 9

• More strongly bonded.
• Have less potential energy.
• More oxidized forms to carbon.