Excellent presentation on diffusion and osmosis as well as the particle theory of matter

1. GRADE: 9
THE
PARTICLE
THEORY
(OSMOSIS
AND
DIFFUSION)

2. Jens Martensson
OBSERVATION TIME!
Questions for activity one (1)- Syrup and Water
1) What happened to the water after the syrup was added?
2) What process do you think is responsible for this?
Activity two (2)
1)What is the main difference between the pea in salt water (labelled A)
versus that in dilute water (B)?
2) What do you think is reason behind your observation?
3)Do you know the name of the process that took place?
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3. Jens Martensson
DISCUSSION TIME!!
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Questions for video
Why was the particulate theory created?
What are the five main points in the particle
theory ?
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Particulate Theory of
MATTER
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Particle Theory
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THE Particle
THEORY OF
MATTER
The Particle theory of matter
states that:
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Particle Theory states that:
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Evidence of the Particle
Theory
Number one:
(Diffusion)
Diffusion is a process that is
explained to confirm that
matter is indeed made up of
tiny particles which can move
around.
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What is Diffusion?
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DEFINITION OF DIFFUSION
Diffusion is the movement of molecules from a region of
higher concentration to a region of lower concentration
until they reach equilibrium.
In other words, diffusion is the process by which particles
spread from a region where there are many to a region
where there are few, until they are evenly distributed.
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Evidence 2- Osmosis
Osmosis
Osmosis is a process by which the molecules of a solvent pass
from a solution of low concentration to a solution of high
concentration through a semi-permeable membrane. For
example, if a freshwater or saltwater fish is placed in the water
with different salt concentrations, the fish dies due to the entry or
exit of water in the cells of the fish.
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Importance of Diffusion in the Body
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One IMPORTANCE OF
DIFFUSION and Osmosis IN THE
HUMAN BODY, Let us discuss!!

19. Jens Martensson
IMPORTANCE OF DIFFUSION IN THE
BODY
•It promotes cellular respiration – In order for cells to survive, they
need oxygen. Oxygen moves from areas of high concentration to low
concentration, allowing the cell to respirate.
• Balances the pressure inside and outside cells.
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Summary time

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Quiz time!
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1.Scientists believe that matter is particulate in nature. State what this means and include
four components of the theory. (4 marks)
2. Anna went to visit her friend next door her home and could immediately tell what her
friends’ mother was cooking. This is likely possible because of which process? (1 mrk)
A) Define the named process above. (1 mrk)
3. Explain what happens in terms of particles when potassium permanganate (VII) crystals
are placed in water. (2 marks)
4. Define the term osmosis. (1 mrk)
5. Slugs, which are garden pests need to keep themselves moist in order to prevent
dehydration and subsequently death. Use this principle to explain why table salt (sodium
chloride), sprinkled on slugs can cause them to die. (2mrks)
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23. Jens Martensson
jens@bellowscollege.com
Thank
You
BOFFIN
Launch
Launch
FUNKY TUNES