1. Elements, Compounds, and Mixtures

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

3. H2 C Cl Na O2 What is an ELEMENT?
A pure substance containing only one kind of atom.
Cannot be separated into simpler materials by chemical or physical means.
Over 100 existing elements are listed and classified on the Periodic Table Cl Na O2

4. What is a COMPOUND? H2O NaCl CO2
A pure substance containing two or more kinds of different elements
The atoms are chemically combined in some way
H2O
Compounds cannot be separated by physical means, separating a compound requires a chemical reaction
Properties of a compound are usually different than the properties of the elements it contains
NaCl
CO2

5. What is a MIXTURE?
Two or more elements or compounds NOT chemically combined
Can be uniform called homogeneous and are known as solutions
Can also be non-uniform called heterogeneous
Can be separated into their components by chemical or physical means

8. Element, Compound or Mixture?

9. Element, Compound or Mixture?

10. Element, Compound or Mixture?

11. Element, Compound or Mixture?

12. Element, Compound or Mixture?

13. Element, Compound or Mixture?

14. 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

15. Element, Compound, or Mixture?
Rocks

16. Element, Compound, or Mixture?
Rocks

17. Element, Compound, or Mixture?
Copper

18. Element, Compound, or Mixture?
Copper Cu

19. Element, Compound, or Mixture?
Jelly Beans

20. Element, Compound, or Mixture?
Jelly Beans

21. Element, Compound, or Mixture?
Table Sugar

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

23. Element, Compound, or Mixture?
Diamond

24. Element, Compound, or Mixture?
Diamond C

25. Element, Compound, or Mixture?
Tea

26. Element, Compound, or Mixture?
Tea

27. Element, Compound, or Mixture?
Salt

28. Element, Compound, or Mixture?
NaCl
Salt

29. Element, Compound, or Mixture?
Neon Gas

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

31. Element, Compound, or Mixture?
Salad

32. Element, Compound, or Mixture?
Salad

33. Element, Compound, or Mixture?
Pure Water

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

35. Element, Compound, or Mixture?
Aluminum

36. Element, Compound, or Mixture?
Aluminum Al

37. Element, Compound, or Mixture?
Lemonade

38. Element, Compound, or Mixture?
Lemonade

39. Element, Compound, or Mixture?
Silver

40. Element, Compound, or Mixture?
Silver Ag

41. Element, Compound, or Mixture?
Sand

42. Element, Compound, or Mixture?
Sand