1. Science Powerpoint
Madeleine Dodge

2. MATTER

4. Scientists classify things by their
composition
Mixtures, elements, compounds

5. How to
classify????
Can separate physically? = Mixture
Can separate chemically? = Pure Substance

6. Mixtures
t wo or more substances
not chemically combined
retain characteristic properties

7. Types of Mixtures:
Homogeneous
Heterogenous

8. Homogenous
appears the same throughout
“well mixed”
the particles that make up the mixture
are very small and hard to recognize

9. Heterogenous
does not appear the same throughout
the particles in the mixture are large
enough to be seen and separated from
the mixture
no specific proportion

10. Types of Pure Substances
Compounds
Elements

11. Elements
made of atoms
atoms in the same elements are alike
atoms in different elements are not

12. Compounds
made from more than one element
can be broken down into simpler
substances

13. SEPARATION
TECHNIQUES

14. Distillation
a process that separates the substances
in a solution based on their boiling
points

15. #1 B
U
#2
F
F
temp (c˚) E
R
plateau
plateau
time (mins)

16. Filtration
a process that separates materials
based on the size of particles and/or
solubility

17. solid isolated
funnel w/ filter paper
filtrate

18. Evaporation
a process used to isolate a solid dissolved
in a liquid property: solubility

19. NaCl: sodium chloride
water

20. CHEMICAL
PROPERTIES

21. What is a chemical property?

22. Any ability to produce a change in the
composition of matter
Chemical properties can be obser ved
only when the substances in a sample or
matter are changing into different
substances.

23. Flammability
a material’s ability to burn in the
presence of oxygen.

24. Flammability
a material’s ability to burn in the
presence of oxygen.

25. Flammability
a material’s ability to burn in the
presence of oxygen.

26. Flammability
a material’s ability to burn in the
presence of oxygen.

27. Reactivity
how readily a substance combines
chemically with other substances

28. What is a chemical change?

29. when a substance reacts and forms one
or more new substances
change in color
production of a gas
formation of a precipitate
change in temperature

30. Review Questions

31. How could you use physical properties
to separate mixtures?

32. What is are the differences bet ween a
solution, suspension, and colloid?

33. What is a physical property?

34. What is an example of a chemical
separation technique that we talked
about?

35. What is a chemical change?