1. Classifying Matter: Elements, Compounds, and Mixtures
By Liz LaRosa

2. The study of matter and its changes
Chemistry:
The study of matter and its changes
Matter:
Anything that has mass and volume

3. Atoms Elements Compounds Molecules
Pure Substances
A sample of matter that has definite chemical and physical properties.
Atoms
Elements
Compounds
Molecules

4. Elements
pure substance that cannot be separated into simpler substance by physical or chemical means.

5. Each element has a name and symbol:

6. Not all elements are equally common

7. Kinetic Molecular Theory
Matter is made of tiny particles called atoms, which combine to form molecules.

9. A group of atoms held together by sharing electrons (covalent bonds)
Molecule:
A group of atoms held together by sharing electrons (covalent bonds)
Compound:
A substance containing more than one element.

10. Four different molecules:
Which are compounds?

11. Compounds
Pure substance composed of two or more different elements joined by chemical bonds.
Made of elements in a specific ratio
that is always the same
Has a chemical formula
Can only be separated by
chemical means, not physically
H2O
NaCl
CO2

12. What are each of these? Atom, Element, Molecule, or Compound

13. Single Chemical Formula:
All pure substances can be represented by a
Single Chemical Formula:
H2O
If it’s really a pure substance, you should only need to write ONE chemical formula to describe it’s composition.

14. All molecules can be represented by a
Chemical Formula:
H2O
subscript

15. Chemical Formulas show how many atoms of each element are in one molecule:
# of Carbon atoms
# of atoms total
# of elements
Chemical Formula O2 1 2
H2O 2 3
C3H8O 3 12 3
C6H12O4Cl 4 23 6

16. How many atoms of each element are present in one molecule of:
(NH4)2SO3
(NH4)2SO3
(NH4)2SO3
(NH4)2SO3
N…………….
H……………
S…………….
O…………… 2 8 1 3 2 8 1 3 2 8 1 3 2 8 1 3

17. Pure Substances: Pure Substances: Pure Substances: Pure Substances:
Are made of only one compound or one element.
Can be represented by one chemical formula.
Examples:
Salt
Salt
Salt
Salt
Salt
Salt
Copper
Copper
Copper
Copper
Water
Water
Water
H2O
NaCl Cu

18. Pure Substance or Mixture?

19. Pure Substances: Pure Substances: Pure Substances: Pure Substances:
Are made of only one compound or one element.
Can be represented by one chemical formula.
Examples:
Salt
Salt
Salt
Salt
Salt
Salt
Copper
Copper
Copper
Copper
Water
Water
Water
H2O
NaCl Cu

20. Heterogeneous Mixture:
Homogenous Mixture
An even mixture; particles are blended evenly throughout the mixture.
(= “solutions”)
Heterogeneous Mixture:
An uneven mixture;
particles are unevenly distributed.

21. Mixtures
A combination of two or more pure substances that are not chemically combined.
substances held together by physical forces, not chemical
No chemical change takes place
Each item retains its properties
in the mixture
They can be separated physically
Chem4kids.com

22. Mixtures vs. Compounds

23. Can you identify the following?
You will be shown a series of photos. Tell if each photo represents an item composed of an element, compound, or mixture.
Review:
An element contains just one type of atom.
A compound contains two or more different atoms joined together.
A mixture contains two or more different substances that are only physically joined together, not chemically.
A mixture can contain both elements and compounds.

24. Element, Compound, or Mixture?
Rocks

25. Element, Compound, or Mixture?
Rocks

26. Element, Compound, or Mixture?
Copper

27. Element, Compound, or Mixture?
Copper Cu

28. Element, Compound, or Mixture?
Jelly Beans

29. Element, Compound, or Mixture?
Jelly Beans

30. Element, Compound, or Mixture?
Table Sugar

31. Element, Compound, or Mixture?
Table Sugar
C12H22O11

32. Element, Compound, or Mixture?
Diamond

33. Element, Compound, or Mixture?
Diamond C

34. Element, Compound, or Mixture?
Tea

35. Element, Compound, or Mixture?
Tea

36. Element, Compound, or Mixture?
Salt

37. Element, Compound, or Mixture?
NaCl
Salt

38. Element, Compound, or Mixture?
Neon Gas

39. Element, Compound, or Mixture?Ne
Neon Gas

40. Element, Compound, or Mixture?
Salad

41. Element, Compound, or Mixture?
Salad

42. Element, Compound, or Mixture?
Pure Water

43. Element, Compound, or Mixture?
Pure Water
H2O

44. Element, Compound, or Mixture?
Aluminum

45. Element, Compound, or Mixture?
Aluminum Al

46. Element, Compound, or Mixture?
Lemonade

47. Element, Compound, or Mixture?
Lemonade

48. Element, Compound, or Mixture?
Silver

49. Element, Compound, or Mixture?
Silver Ag

50. Element, Compound, or Mixture?
Sand

51. Element, Compound, or Mixture?
Sand

53. Notes Detailed notes are located at:
mixtures-notes-isn.pdf
Flow Chart:
isn.pdf