Evidence for the Particle Theory of Matter

Difference between law and theory

Experiments proving kinetic theory

Brownian motion

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4TH FORM CHEMISTRY - TOPIC 1: KINETIC THEORY
EVIDENCE FOR THE PARTICLE THEORY OF MATTER - HOMEWORK
NAME:
Today's practicals were intended to demonstrate some evidence for the particle theory of matter.
Like all scientific theories, it is not possible to prove it, however we can provide evidence that
supports the theory.
Explain briefly why scientific theories cannot be proved
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At its simplest experimental science follows a simple pattern of:
OBSERVATION - DEDUCTION - THEORY - FURTHER EXPERIMENTATION
Diffusion of Potassium Permanganate in Water
Observation
What was observed when a crystal of Potassium Permanganate was dropped in a beaker of cold
water?
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What was different when a similar crystal was dropped into a beaker of warm water?
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Deduction
How can we explain the first observation?
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What therefore can we deduce about warm water from the second observation?
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Dilution of Potassium Permanganate in Water
Observation
Describe clearly and accurately what was observed as the solution of Potassium Permanganate was
diluted.
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Deduction
What does this tell us about the size of a Potassium Permanganate molecule? Be as quantitative as
you can.
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Reacting Ammonia and Hydrogen Chloride Gases
Method and Diagram
Draw a diagram of the set up used in this experiment
Explain briefly what we did.
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Observation
Describe the observations made during this experiment.
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What does the fact that this ring forms tell us about what is happening to the two chemicals.
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Why does the ring form closer to one side than the other? What does this tell us about the diffusion
process and the speed of molecules at a given temperature?
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Brownian Motion
Research and explain in your own words what Brownian motion is at a macroscopic level. I.e. what
your observations would be.
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