2. Life: Macro to Micro Biosphere Ecosystem Community Population Organism
Organ system
Organ
Tissue
Cell
Molecule
Atom

3. What is matter? WHAT IS MATTER? Anything that takes up space.

4. This shows 2 phases of water.

6. Humans: What Are We Made Of?

7. What are some elements? Carbon Hydrogen Oxygen Nitrogen Phosphorus
Sulfur

9. That Darn Periodic Table
What do all those numbers mean anyway?
Atomic number
Number of what?
Unique to each element
Mass number
Sum of what?

10. http://61. 19. 145. 8/student/m5year2006-2/502/group11/periodic_table

11. Matter is made up of ATOMS What are the 3 parts of an atom?

12. ATOMS http://www.purchon.com/chemistry/helium.htm

13. Filling The Energy Shells
(Empty circle = no electron present)

14. ATOMS and their PARTICLES
Atomic # = # p+
# p+ = # e-
Atomic Mass = # p+ + # N
Element
Atomic #
Mass
# p+
# N
# e- Al O

16. There’s Different Kinds of Carbon?
Isotopes
When an element can have different numbers of what?
Carbon = very good example

17. Bonding: 3 types Covalent Ionic Hydrogen

19. Covalent Bonds: 2 elements share electrons

21. Covalent Bonding

22. Ionic Bonds
Transfer of electrons

24. Ionic Bonding
Ion: Atom gains or loses an electron

25. What is the molecular formula for these molecules?
What is this?
Water
What is the molecular formula for these molecules?
H2O

26. How many water molecules?
5 Waters = 5H2O

27. Representing Molecules

29. What is the molecular formula of glucose?
C6H12O6

30. What is the molecular formula of fructose?
ISOMERS

31. If I rip a piece of paper how does the paper change?
PHYSICAL CHANGE

32. What about if I burn it?
CHEMICAL CHANGE

33. What happens to the milk?

36. Chemical Reactions
Must be balanced!
Reactants vs. products

37. Chemical Equations
H H2 + O2
Products
Reactants

38. Water & Life Life began in water 3/4 of Earth is water
All living things need water
Your cells ≈ 70-95% water

39. Structure of Water Polar Unequal sharing of electrons
Opposite charges on opposite ends
Appears bent

40. Water Molecules have a slight charge.
Polar molecule

41. Structure of Water
Hydrogen bonds
Weak attractions

42. POLAR

43. Cohesion – Same molecules that stick together

44. Adhesion – Different molecules that stick together
Ex. Capillary Action

45. Water’s Life-Supporting Properties
Cohesive
Much stronger
Trees: transport water ST

46. Water’s Life-Supporting Properties
Moderates temperature
Heats & cools slowly
Earth’s water
Evaporative cooling

47. Water’s Life-Supporting Properties
Ice
Density of water
Ice floats
Why is this important?

48. Water’s Life-Supporting Properties
Solvent
Water can dissolve many things
The medium for chemical reactions

49. pH Potential Hydrogen Measures amount of H ions in a solution
Amount of acid or base.

50. Acids, Bases & pH
pH scale
Measurement of H+ ions
Acid:
Neutral:
Base:

51. Each pH unit represents a 10 fold change.

52. Now, that wasn’t so bad, was it?
Now, that wasn’t so bad, was it?