1. C HEMISTRY IN B IOLOGY

2. A TOMS Everything is composed of atoms Atoms are made of 3 parts Protons – have a positive charge Electrons – have a negative charge Neutrons – have no charge (They are neutral!) Protons and neutrons make up the nucleus, which is the center of the atom

3. L ABEL THE ATOM BELOW …

4. A TOMS CONT ’ D … Protons and electrons are ATTRACTED to each other because they have opposite charges Each element on the periodic table is an atom Carbon, oxygen, hydrogen, nitrogen, and phosphorus are elements that are found in living things

5. C OLOR THE ELEMENTS THAT WERE NAMED …

6. B ONDS Atoms bond together to form molecules Molecules can have single, double, and triple bonds

7. O N THE MOLECULES BELOW, HIGHLIGHT SINGLE BONDS IN YELLOW, DOUBLE BONDS IN ORANGE, AND TRIPLE BONDS IN BLUE H H H C C H H H H C C H

8. R EACTIONS Molecules can be made or broken down during a chemical reaction Ex: 6CO 2 + 12H 2 O C 6 H 12 O 6 + 6H 2 O + O 2 Every reactions has reactants that YIELD products

9. R EACTIONS CONT ’ D … Reactants are always on the left side of the reaction Reactants go into the reaction Products are always on the right side of the reaction Products come out of the reaction The arrow in the middle means yields

10. L ABEL THE REACTANTS, PRODUCTS AND YIELD IN THE CHEMICAL EQUATION BELOW 6CO 2 + 12H 2 O C 6 H 12 O 6 + 6H 2 O