1. #1 Figure 8.1 Atoms 2 examples of elements: H and C
Same number of electrons and protons
neutral atoms (no charge)

2. #2 Figure 8.7 - Covalent Bonds in Molecules
Covalent bonds share electrons

3. #3 Figure Molecules
Number of electrons determines the number of bonds
Molecules are formed when atoms bond together

4. #4 Figure 8.3 - Endothermic Reactions
Endothermic reactions take in heat
ice melting: needs energy put in; no change in molecules, only in organization so it is an endothermic process
endothermic reaction: chemical bonds break and reform - add energy to water to form O2 and H2 gases

5. #5 Figure Enzymes
Top: synthesis = forming one new product from two (or more) substrates
Bottom: decomposition = breaking down molecules into smaller parts
Enzyme doesn’t change in reaction; only the substrate and the products

6. #6 Figure 8.5 - Potential and Kinetic Energy
Potential energy - stored energy; has the ability to do work but is not yet doing it
Kinetic energy - energy of movement

7. #7 Figure 8.6 - Regulating Energy Storage
Glycogen = stored glucose
Using a lot of energy-body converts stored glycogen to glucose for energy
Using less energy-body converts food to storage molecules (like glycogen)

8. #8 Figure 8.9 - Structure of ATP
Body stores energy by forming ATP
Release energy by removing P from ATP
ATP → ADP
energy is released when this happens