1. Scientific Notes
FRom the section of
2.1-2.2
by: parker door

2. Compounds

3. Compounds

4. Compounds
A compound is a substance that is
made from two or more simpler
substances and that can be broken
down even more.
A compound always contains two
or more elements joined in a fixed
proportion.
Ex: Silicone Dioxide is compound, it
is a colorless transparent solid, it is
made from a colorless gas and a
gray solid. It is used to make
computer chips.

5. Mixtures

6. Mixtures
The properties of a mixture can vary
because the composition of a mixture is
not fixed.
Mixtures can form into 1 or 2
things, it can change into a
heterogenous mixture or a
homogenous mixture.
Ex: Ingredients is one kind of
salsa, which is an example of
heterogenous mixture.

7. The properties of a mixture can vary
because the composition of a mixture is
not fixed.
Mixtures can form into 1 or 2
things, it can change into a
heterogenous mixture or a
homogenous mixture.
Ex: Ingredients is one kind of
salsa, which is an example of
heterogenous mixture.

8. Elements

9. Elements

10. Elements

11. Elements
An element has a a
fixed composition
because it contains
only one type of
atom.
No two elements can
ever have the same
type of atom.

14. • Matter that always has
exactly the same
composition is classified
as a pure substance.
• Every sample of a given
substance has the same
properties because a
substance has a fixed,
uniform composition.

15. Pure substances
• Matter that always has
exactly the same
composition is classified
as a pure substance.
• Every sample of a given
substance has the same
properties because a
substance has a fixed,
uniform composition.

17. Subtance Melting Point Boiling Point
Hydrogen -259.3˚c -252.9˚c
Nitrogen -210.0˚c -195.8˚c
Ammonia -77.7˚c -33.3˚c
Octane -56.8˚c 125.6˚c
Water 0.0˚c 100.0˚c
Acetic Acid 16.6˚c 117.9˚c
Table Salt 800.7˚c 1465˚c
Gold 1064.2˚c 2856˚c

18. MELTING & BOILING POINT
Subtance Melting Point Boiling Point
Hydrogen -259.3˚c -252.9˚c
Nitrogen -210.0˚c -195.8˚c
Ammonia -77.7˚c -33.3˚c
Octane -56.8˚c 125.6˚c
Water 0.0˚c 100.0˚c
Acetic Acid 16.6˚c 117.9˚c
Table Salt 800.7˚c 1465˚c
Gold 1064.2˚c 2856˚c

19. MELTING & BOILING POINT
The temperature at which a Subtance Melting Point Boiling Point
substance changes from Hydrogen -259.3˚c -252.9˚c
solid to liquid is its melting Nitrogen -210.0˚c -195.8˚c
point. Ammonia -77.7˚c -33.3˚c
Octane -56.8˚c 125.6˚c
The temperature at which a
Water 0.0˚c 100.0˚c
substance boils is its boiling
Acetic Acid 16.6˚c 117.9˚c
point.
Table Salt 800.7˚c 1465˚c
Gold 1064.2˚c 2856˚c

20. The temperature at which a Subtance Melting Point Boiling Point
substance changes from Hydrogen -259.3˚c -252.9˚c
solid to liquid is its melting Nitrogen -210.0˚c -195.8˚c
point. Ammonia -77.7˚c -33.3˚c
Octane -56.8˚c 125.6˚c
The temperature at which a
Water 0.0˚c 100.0˚c
substance boils is its boiling
Acetic Acid 16.6˚c 117.9˚c
point.
Table Salt 800.7˚c 1465˚c
Gold 1064.2˚c 2856˚c

23. CONDUCTIVITY

24. CONDUCTIVITY
A materials ability to allow
heat to flow is called
conductivity.
Materials conductivity is very
high, such as metals.

25. EVAPORATION
A process used to isolate
a solid dissolve in a liquid.
Properties: Solubility
Sodium Chloride:
Table Sat

26. DISTILLATION
B
U
F
A process that separates F
the substances in a
solution bases on boiling
E
points. R
Plateau

27. FILTRATION
The process
that separates
matter based
on the size of
the materials
there solubility.

28. 2.3
Chemical properties can be observed only when the substances in
a sample of matter are changing into different substances.
Three common types of evidence for a chemical change are a
change in color, the production of gas and the formation of the
precipitate.
Raw eggs and hard boiled eggs have different properties, hardness
and viscosity.

29. 2.3
The rusting of an iron bar weakens the strength of the bar
because iron is highly reactive.
When matter under goes chemical change, the composition of
the matter changes. When matter undergoes a physical change
the composition stays the same.
The burning is chemical change and the melting is a physical
change.

30. 2.3
Gold and iron don’t have a high reactivity to other metals.

31. QUESTIONS FOR TEST
How do you use physical properties to identify changes?

32. QUESTIONS FOR TEST
There are four ways to recognize a chemical change?
List the four ways?

33. QUESTIONS FOR TEST
State the definition of a physical change?

34. QUESTIONS FOR TEST
State the definition of a chemical change?

35. QUESTIONS FOR TEST
What are the differences of colloids, soulutions and suspension?
list 2 for each...