PS elements compounds123456 mixtures.ppt

science 7

2. How can you determine whether
something is an element or not?
They are all listed on the periodic table.
ELEMENT SO
NG

3. 1.Pure substance
–Made of only 1 type
of particle
–Ex: copper wire only
has copper atoms
2.Can’t be separated
into simpler
substances by
chemical or physical
means

4. 3.Each has a unique
set of properties
–Called characteristic
properties
–Can be physical or
chemical
4.Classified by their
properties
1.Metals
2.Nonmetals
3.Metalloids
Elements
Metals
Nonmetals
Metalloids

5. Develop the concept map by adding
info. about metals, nonmetals, &
metalloids
METALS
•Shiny
•Good conductors
•Malleable
•Ductile
•Ex: gold, silver,
copper
NONMETALS
•Dull (no shine)
•Poor conductors
•At room temp, only a
few are solids that
are brittle
•Most are gases
•Ex: hydrogen,
oxygen, helium
METALLOIDS
•Characteristics of
metals and nonmetals
•Semiconductors
•Ex: silicon, germanium

6. Use placement on the Periodic
Table to classify elements

7. •Do you know any compounds?
•How are they different from elements?
•Characteristics
1.Found in nature more often than pure elements
2.Have more than one element
3.Elements are chemically bonded to each other
–Mg + O
2 makes MgO
4.Pure substances that occur in fixed ratios by mass
–1g H to 8g of O in every water molecule
5.Can’t be separated by physical means
6.Have their own unique set of properties

8. CLASSIFICATION OF MATTER

9. Mixtures
•2 or more substances that are not chemically
bonded
–So diff parts keep their own properties
•Ex:
–pizza
–granite
–Kool-aid
–Brass
–Jello
•Parts do not occur in a definite ratio
–Compare the 2 pepperoni pizzas

10. Mixtures
•Can be physically separated by
1.Distillation
2.Magnet
3.Centrifuge
4.Filtration
5.Evaporation

11. ELEMENTS COMPOUNDS MIXTURES

12. Mixtures
•Can be heterogeneous (see diff pieces) or
homogeneous (uniform appearance)
•Homogeneous mixtures are called solutionssolutions
•Heterogeneous mixtures include suspensionssuspensions
•Colloids are classified as heterogeneous in some
books and homogeneous in others

13. Solutions – look the same throughout
•From Chem4kids
•How much solute can
dissolve in water?
•Solubility graph can tell you
1.Most compounds show
a(n) ________ in
solubility as temp. inc.
2.Which compound shows
the greatest increase in
solubility as temp inc?
3.Which compound(s)
actually dec in solubility
as temp inc.?
4.How much potassium
nitrate will dissolve in
100 ml of water at 40
o
C?
5.How much sodium
nitrate will dissolve in
100 ml of water at 90
o
C?

14. Solubility Graph
1.Which compound
shows the greatest
increase in solubility as
temp inc?
2.Which compound(s)
actually decrease in
solubility as temp inc.?
3.Which compound has
the highest solubility at
58
o
C?

15. Fill-in the Venn
diagram with
characteristics.

16. •Do not settle out
•Pass thru filter
paper
•Settle out on standing
•Separate w/filter paper
•Largest particle size (seen)
•Ex: blood, muddy water,
Italian salad dressing
•Scatter
light
•Don’t scatter light/
light passes right thru
•Smallest solute
particles
•mixtures
•Medium particle
size
•Don’t easily pour
•Ex: Jell-o, fog,
milk, mayo,
whipped cream
•Ex:
Kool-
aid, salt
water,
brass
Can pour
some