2. Organisms and the Environment

3. Chapter Four: Physical Science Connections 4.1 Elements and Compounds 4.2 The Compounds of Life 4.3 Physical Variables

4. 4.1 Elements and Compounds In the 1950s, American scientist Stanley Miller tried to find a recipe for life. While Miller did not find a recipe for making life, he DID make amino acids, building block molecules of cells.

5. 4.1 Elements and compounds The ingredients for life are simple. Your body is mostly three elements: carbon, oxygen, and hydrogen. An element is the simplest form of matter. The top three elements are what total percent of the body?

6. 4.1 Atoms, compounds and molecules A single atom is the smallest particle of an element that keeps the chemical identity of the element. Each element has a unique type of atom.

7. 4.1 Atoms, compounds and molecules A compound is a substance that contains two or more different elements that are chemically joined.

8. 4.1 Atoms, compounds and molecules A molecule is a group of two or more atoms joined together chemically.

9. 4.1 Atoms, compounds and molecules Many substances you encounter are a mixture of different elements and compounds. How many atoms are in this mixture? How many molecules are in this mixture?

10. 4.1 Chemical reactions A chemical reaction is a process that rearranges the atoms of one or more substances into one or more new substances.

12. 4.1 Importance of water Liquid water is used to transport molecules where they need to go, inside and outside of cells. Review: What is a solution?

13. 4.1 The importance of water Water’s properties make it a valuable substance for life. 1.It is a good solvent. 2.It has a wide range of temperatures. 3.It has a high specific heat. This water is boiling at the bottom of the ocean!