1. November 17, 2017
Journal: What special property of water causes it to stick together and form a ball when placed on wax paper?

2. Chemical Reactions

3. Physical Change
A change in size, shape, or state of matter that does not result in a new substance being formed

4. Chemical Change
A change in the physical and chemical properties of a substance so after the reaction takes place a new substance is formed

5. Chemical Reaction
The process of rearranging the bonds within two or more substances in order to form at least one new substance

6. 6CO2 +6H20  C6H12O6 + 6O2
The number before the compound tells you how many there are of each compound
Atomic symbols tell what elements are in the compound
Subscripts tell how many of each element are in the compound
***Must have an equal number of each element on both sides of the reaction

7. Reactants
A substance that is present at the beginning of a chemical reaction

8. Products
A substance that is formed during a chemical reaction

9. Conservation of Mass
Matter cannot be created or destroyed, only rearranged

10. Acids and Bases

11. pH H2O will sometimes split to form H+ and OH-
In pure water, H+ = OH- , so water is neutral
pH scale is based on the number of H+ and OH- in solution

12. Acids and Bases
An acid has more H+ while a base has more OH-

13. pH scale Ranges from 0 - 14 7 is neutral (water) pH < 7 = acid
pH > 7 = base
Based on a factor of 10

14. Acids Highly corrosive Burning Sour taste
Ex. HCl, acetic acid, citric acid

15. Bases Feel slippery Bitter taste Very few foods, some medicine
Ex. Oven cleaner, bleach

16. pH in an organism Most cells work best around pH 7
Too high or too low pH cause enzymes in the body to stop working
To prevent large pH swings, organisms use buffers