1. Physical and Chemical changes molecules

2. Chemical and physical changes

3. Physical Change
A Physical change is a change in a substance that does not change what the substance is.

4. Physical Change - examples
Examples of physical change include:
Change in shape
Change in size
Change in phase
Melting (solid to liquid)
Boiling (liquid to gas)
Evaporation (liquid to gas)
Condensation (gas to liquid)
Freezing (liquid to solid)
Sublimation (solid to gas)
Deposition (gas to solid)

5. Physical Change Physical changes might be caused by: Grinding Cutting
Crushing
Bending
Breaking
Heating/cooling
(change in phase)
squishing

6. Physical Change
Evidence that a physical change has occurred might include:
Change in shape
Change in form
Change in size
Change in phase (This is always a physical change!)
Physical changes are usually reversible

7. Physical change
What could you do to these items to cause a physical change to occur?

8. Chemical change
A chemical change is a change in which a substance is changed into a different substance. (You’ve changed what it is.)

9. Chemical change Examples of chemical changes include: Burning Rusting
Tarnishing
Decomposing
Polymerization

10. Chemical change
Chemical changes occur when a chemical reaction causes bonds between atoms to break or to form.

11. Matter
All matter is composed of atoms and groups of atoms bonded together, called molecules.
Substances (atoms or molecules) that are made from one type of atom only are called elements.
Substances (molecules) that are made from more than one type of atom bonded together are called compounds.

12. Elements, Compounds, Mixtures
Sodium is an element.
Chlorine is an element.
When sodium and chlorine bond they make the compound sodium chloride, commonly known as table salt.
Compounds have different properties than the elements that make them up.
Table salt has different properties than sodium, an explosive metal, and chlorine, a poisonous gas.

13. Elements, Compounds, Mixtures
Hydrogen is an element.
Oxygen is an element.
When hydrogen and oxygen bond they make the compound water.
The compound water has very different physical and chemical properties from the hydrogen and oxygen which create water through bonding.
The ocean is a mixture.

14. Elements, Compounds, Mixtures
When salt and water are combined, a mixture is created. Mixtures retain their individual properties. Even though mixtures contain more than one substance, mixtures are not considered compounds.
The ocean is a mixture.

15. Read and review:

16. Molecules
Video Clip intro to molecules
PHET Build a Molecule

17. Elements, compounds, and mixtures
Mixtures can be separated by physical means.
Compounds can only be separated by chemical means.

18. H2O LEGO MOLECULE RACE!! Make this molecule!! BLACK: HYDROGEN
RED: OXYGEN
WATER!!

19. KOH LEGO MOLECULE RACE!! Make this molecule!! BLACK: POTASSIUM
BLUE: OXYGEN
YELLOW: HYDROGEN
POTASSIUM HYDROXIDE!!

20. CO LEGO MOLECULE RACE!! Make this molecule!! BLACK: CARBON
BLUE: OXYGEN
CARBON MONOXIDE!!

21. LEGO MOLECULE RACE!!
Make this molecule!! O2
BLUE: OXYGEN
OXYGEN!!

22. HNO3 LEGO MOLECULE RACE!! Make this molecule!! BLACK: HYDROGEN
RED: NITROGEN
BLUE: OXYGEN
NITRIC ACID!!

23. H2CO3 LEGO MOLECULE RACE!! Make this molecule!! BLUE: OXYGEN
YELLOW: HYDROGEN
BLACK: CARBON
CARBONIC ACID!!!

24. SODIUM CHLORIDE (SALT)!!
LEGO MOLECULE RACE!!
Make this molecule!!
NaCl
BLACK: CHLORINE
RED: SODIUM
SODIUM CHLORIDE (SALT)!!

25. H2SO4 LEGO MOLECULE RACE!! Make this molecule!! BLACK: HYDROGEN
BLUE: OXYGEN
YELLOW: SULFUR
SULFURIC ACID!!

26. HCl LEGO MOLECULE RACE!! Make this molecule!! BLACK: CHLORINE
BLUE: HYDROGEN
Hydrochloric Acid!!

27. CO2 LEGO MOLECULE RACE!! Make this molecule!! BLACK: CARBON
RED: OXYGEN
CARBON DIOXIDE!!

28. Na2SO4 LEGO MOLECULE RACE!! Make this molecule!! YELLOW: SODIUM
RED: SULFUR
BLUE:OXYGEN
SODIUM SULPHATE!!

29. ACETAMINOPHEN (TYLENOL)!!
LEGO MOLECULE RACE!!
Make this molecule!!
C8H9O2N
YELLOW: CARBON
RED: HYDROGEN
BLUE:OXYGEN
BLACK: NITROGEN
ACETAMINOPHEN (TYLENOL)!!

30. C9H8O4 LEGO MOLECULE RACE!! Make this molecule!! YELLOW: HYDROGEN
RED: OXYGEN
BLUE:CARBON
ASPIRIN!!!!

31. C10H10O5 LEGO MOLECULE RACE!! Make this molecule!! YELLOW: CARBON
BLUE: OXYGEN
BLACK: HYDROGEN
STARCH

32. K2SO4 LEGO MOLECULE RACE!! Make this molecule!! YELLOW: NITROGEN
RED: CARBON
BLUE: OXYGEN
BLACK: HYDROGEN
SULFATE of POTASH

33. C3H9N LEGO MOLECULE RACE!! Make this molecule!! YELLOW: HYDROGEN
RED: NITROGEN
BLUE: CARBON
TRIMETHYLAMINE

34. C6H12O6 LEGO MOLECULE RACE!! Make this molecule!! YELLOW: OXYGEN
RED: CARBON
BLUE: HYDROGEN
GLUCOSE (SUGAR!!)

35. NH3 LEGO MOLECULE RACE!! Make this molecule!! YELLOW: HYDROGEN
RED: NITROGEN
AMMONIA!!

36. C6H8O7 LEGO MOLECULE RACE!! Make this molecule!! YELLOW: OXYGEN
BLACK: HYDROGEN
BLUE: CARBON
CITRIC ACID

37. C8H10N4O2 LEGO MOLECULE RACE!! Make this molecule!! YELLOW: NITROGEN
BLACK: HYDROGEN
BLUE: OXYGEN
RED: CARBON
CAFFEINE

38. CaCO3 LEGO MOLECULE RACE!! Make this molecule!! BLACK: CALCIUM
BLUE: CARBON
RED: OXYGEN
CHALK

39. H2O2 LEGO MOLECULE RACE!! Make this molecule!! BLACK: OXYGEN
BLUE: HYDROGEN
HYDROGEN PEROXIDE

40. CH4 LEGO MOLECULE RACE!! Make this molecule!! BLACK: HYDROGEN
YELLOW: CARBON
METHANE

41. N2O LEGO MOLECULE RACE!! Make this molecule!! BLACK: NITROGEN
YELLOW: OXYGEN
NITROUS OXIDE

42. KNO3 LEGO MOLECULE RACE!! Make this molecule!! BLACK: POTASSIUM
YELLOW: OXYGEN
RED: NITROGEN
SALTPETRE

43. As2O3 LEGO MOLECULE RACE!! Make this molecule!! BLACK: ARSENIC
YELLOW: OXYGEN
ARSENIOUS OXIDE

44. CHCl3 LEGO MOLECULE RACE!! Make this molecule!! BLACK: CHLORINE
RED: CARBON
YELLOW: HYDROGEN
CHLOROFORM