My powerpoint having to do with science.

2. 8th Grade Science

4. A Powerpoint by Adreanna Thompson-
Paschetto

6. Scientific Approach
Make an observation
Ask a question
Develop a hypothesis
Test hypothesis with an experiment Revise
Test
hypothesis hypothesis
with further
Analyze data and draw conclusions
experiments
Hypothesis is Hypothesis is
supported not supported
Develop theory

7. Safety
While in the lab, never:
Run, jump, or take part in any sort
of horse play
Leave your hair down.
Leave a flame unattended
Eat food or taste something which
is being tested

8. Elements
An element is a pure substance
which can be broken down and
still have the same properties.
Ex: Gold, Hydrogen, Iron, oxygen

9. Mixtures
A mixture is a combination of two
or more substances.
A homogenous mixture is a mixture
in which all substances are evenly
distributed.
A heterogeneous mixture has layers,
or unevenly mixed elements.

10. Measurement
Quantity Unit Symbol
Length meter m
Mass kilogram kg
Temperature celsius C
Time second sec
Amount of
mole mol
Substance
Electric
ampere A
Current
Luminous
candela cd
Intensity

11. Solutions, Suspensions,
and Colloids
When a substance is dissolved in another
substance, what results is a solution.
A suspension is formed when two
substances of different densities are mixed,
and one is suspended above the other.
A colloid is a mixture of particles of
different sizes which mix unevenly.

12. Physical Properties
Physical properties are properties
that can be observed.
These are things such as viscosity,
conductivity, malleability, hardness
and density.

13. Filtration
Filtration involves running a
mixture with different particle
sizes through filter paper or cloth.

14. Distillation
To distill a mixture, you use a
distillation apparatus, which
evaporates one substance and
leaves the other.

15. Evaporation
To evaporate something, you either
heat or leave out a substance and
allow it to evaporate and leave
behind a solid.

16. The Difference
Between Chemical
To be a physical property something
needs to be able to be observed
without energy.
A chemical property involves either
fire, heat, or electricity.

17. Chemical Changes
Change in color: this is when an
object reacts with the environment,
like bananas.
Production of gas: when a mixture
begins bubbling and releases any
sort of gas.
Formation of precipitate: when a
mixture curdles, like milk mixed
with lemon juice.

18. Question #1
You are given a mixture of water,
ethanol, and graham cracker
crumbs. How do you separate it?

19. Question #2
What is the physical property
involving brittleness called?
a) Viscosity
b) Malleability
c) Boiling Point
d) Color

20. Question #3
True or false; liquid fills whichever
space is given to it.

21. Question #4
What is the difference between
chemical and physical properties

22. Question #5
True or false; energy is needed in
a chemical reaction.