1. Do Now
What is energy?
What is the ultimate source of energy on the earth?
Where do we get our energy from?

2. Objectives To define energy. To list the different types of energy.
To explain the laws of thermodynamics.
To begin discussing photosynthesis and cellular respiration

3. Section 8.1: How organisms obtain energy!!

4. So what is energy?? Energy- The ability to do work!! Thermodynamics-
is the study of the flow and transformation of energy in the universe.

5. 3 Types of Energy
Chemical
Potential
Kinetic

6. 3 Types of Energy Potential- stored energy, or energy of position
Ex: top of the rollercoaster!
Kinetic- motion
Ex: moving down from top of rollercoaster!
Chemical- energy found in bonds (released when bonds are broken, stored when bonds are formed)
Ex: lighting a match (released or stored?)

7. Laws of Thermodynamics
First law —energy can be converted from one form to another, but it cannot be created nor destroyed.
Ex. Stored energy to chemical energy to mechanical energy

8. Do Now!!  (P. 6) What is the first law of thermodynamics?
What are the three types of energy?
How can plants harness energy from the sun?

9. Objectives To discuss the second law of thermodynamics
To define metabolism and differentiate between anabolic and catabolic pathways.
To define ATP
To read and analyze the article “Will we ever photosynthesize like plants?”

10. Laws of Thermodynamics
Second law —energy cannot be converted without the loss of usable energy.
Ex. Energy Lost as Heat

11. Second Law of Thermodynamics
Entropy
Measure of unusable energy in a system.
Ex: thermal energy
Entropy always increases.

12. Do Now!!  Please take out your homework!
What are the 2 laws of thermodynamics?
What is entropy?
What is metabolism?

13. Objectives
To define metabolism and differentiate between anabolic and catabolic pathways.
To define ATP
To be able to list the inputs and outputs of photosynthesis.
To be able to identify the structures of a chloroplast.
(“Quest” on photosynthesis next week!)

14. Review of Reactions… Endothermic- uses energy to make bonds
H + H H2
Energy put in
Exothermic- breaks bonds and releases energy
H H + H
Energy Released

15. Autotrophs and Heterotrophs
Autotrophs: make their own energy
Ex:
Heterotrophs: have to eat to obtain energy

16. Do Now!!  (P.2)
What is the first law of thermodynamics? The second law?
What is entropy?

17. Objectives
To define metabolism and differentiate between anabolic and catabolic pathways.
To define ATP
To read and analyze the article “Will we ever photosynthesize like plants?”

18. Metabolism Metabolism: All chemical reactions in a cell
Two types of Metabolic Pathways:
Catabolic: Release energy by breaking down larger molecules
Anabolic: Use energy to build larger molecules from smaller ones

19. Think- Pair - Share
Of the following examples, list which ones are catabolic and anabolic
1. Amino acids becoming polypeptide chain
2. Glucose becoming glycogen
3. Your body breaking down food
4. Lifting weights and building up muscle mass

20. Adenosine Tri Phosphate (ATP)
ATP: most important biological molecule that provides chemical energy
Structure:
Adenine base, ribose sugar, and 3 phosphate groups
Function: Releases energy when bonds are broken

21. Processes involving Energy…
Cellular respiration —organic molecules are broken down to release energy for use by the cell
-type of process:
Photosynthesis —light energy from the Sun is converted to chemical energy for use by the cell

22. Next up… Photosynthesis!!