PARTICLE THEORY OF MATTER
How do we know that substances are made of particles?
a. Because substances dissolve evenly through another
liquid
b. Because very small particles diffuse through a solid, liquid
or gas in even distribution
c. Because some substances can be compressed (squeezed)
into smaller spaces
INVESTIGATING DIFFUSION
Aim: To investigate diffusion in liquid
Equipment: Food dye, measuring cylinder,
test tube, stopwatch
Method:
a. Fill a test tube with 30ml of COOL TAP water using a
measuring cylinder
b. Fill another test tube with 30ml of WARM water
c. Add a drop of food dye to both test tubes at the same
time and let the mixture stand for 3 minutes.
Diagram:
Results: Observations (What did you notice?)
The food dye travelled faster in the ________ water as it was
the first one to become completely d________ in the whole
solution.
Discussion Questions (leave 4 lines for each question):
a. Did the colour spread through the test tube just by
gravity? Why or why not?
b. Explain how the temperature affected your observations
3. Explain the process of diffusion in terms of particles
GIFS:
Diffusion: http://cronodon.com/BioTech/Diffusion.htmlFood
Dye Moving in Water: https://makeagif.com/gif/diffusion-water-food-dye-diffusion-project-7yGVKZParticle
Moving between other particles: https://en.wikipedia.org/wiki/File:Chemical_surface_diffusion_slow.gif