1. Review of Classification of Matter
Describing Matter
Physical Property
Physical Change
Chemical Change
Chemical Property

2. A. Physical Property
A characteristic of a substance that can be observed without changing its identity.
can be used to separate mixtures
EX: magnetism, density

3. B. Physical Change
A change in the form of a substance without changing its identity.
properties remain the same
reversible
can be used to separate mixtures
EX: dissolving, grinding

4. C. Chemical Change A change in the identity of a substance.
properties change
irreversible
Signs: color change, formation of a new substance (gas/solid), release of light/heat (energy change)
EX: burning, rusting

5. D. Chemical Property
A characteristic that indicates whether a substance can undergo a specific chemical change.
EX: flammability, reactivity

6. II. Composition of Matter Anything that has mass and takes up space

7. Can it be separated by physical means?
A. Matter Flowchart
MATTER
yes no
Can it be separated by physical means?
MIXTURE
PURE SUBSTANCE
Is the composition uniform? no
yes
Can it be decomposed by chemical means? no
yes
Homogeneous Mixture
(solution)
Heterogeneous Mixture
Compound
Element

8. B. Pure Substances Element matter composed of identical atoms
EX: copper

9. B. Pure Substances Compound
matter composed of 2 or more elements in a fixed ratio
properties differ from those of individual elements
EX: salt (NaCl)

10. C. Mixtures Variable combination of 2 or more pure substances.
Homogeneous Mixture - Solution
even distribution of components
very small particles
particles never settle
EX: saline solution, air

11. Solutions
Particles dissolved are the size of atoms…or compounds – tiny little pieces of matter.
Solutes (the stuff dissoved) can’t be filtered out.

12. C. Mixtures Heterogeneous Mixture uneven distribution of components
colloids and suspensions
EX: granite

13. C. Mixtures Colloid medium-sized particles
Tyndall effect - particles scatter light (looks cloudy)
particles never settle
EX: milk, fog

14. C. Mixtures Suspension large particles particles scatter light
particles will settle (needs to be shaken)
EX: fresh-squeezed lemonade, salad dressing, tomato juice

15. So how do we distinguish between solution, colloid and suspension?
Each of these are technically classified based on the size of the particles that are dissolved in the solution.
Suspension – Big particles dissolved, but will settle out.
Solution – smallest particles
Colloid – in the middle

16. Check your understanding:
What factor distinguishes a suspension from a colloid? a) light reflects off the particles of a suspension b) the particles of a suspension will sink out if left over time to rest c) suspensions are clear d) suspensions cannot be filtered

17. Check your understanding:
An example of a homogeneous mixture is___ a) sand and water b) flour and water c) salt dissolved in water d) oil and water

18. Check your understanding:
Which statement is not true. a) particles in a colloid will reflect light b) the particles of a solution are molecule in size c) a suspension can be filtered d) a solution can be filtered

19. Check your understanding:
What is one property of a suspension that is different from that of a solution or a colloid? a) If left to rest, the particles of a suspension will settle out. b) The particles of a suspension reflect light. c) A suspension is always clear d) Suspensions are colorless