1.4 Activity 5 : Defining diffusion, diluting and dissolving
Gases can diffuse into each other . This is because the particles in a gas are in a state of constant random motion.
Liquids can diffuse into other liquids. When the two liquids mix well in each other they are said to be soluble.The diffusing of one liquid ( the solute) into another ( the solvent) results in the dilution of the solute by the solvent.
The food colouring video here shows dilution in action.
Watch both the video and the animation carefully.
In your own words:
- Describe what happens.
- Try to explain what happens
- Explain why the colour spreads faster in the hot beaker
Use the each of the following words at least once:
food colouring, dissolve, particles , constant motion, soluble, water , faster , diffuse , diluted
1.4 - 1.7 What's the best solution?
Students should:
1.4 know what is meant by the terms: solvent, solute, solution, solution, saturated solution.
1.5C know what is meant by the term solubility in the units g per 100 g of solvent
1.6C understand how to plot and interpret solubility curves
1.7C practical: investigate the solubility of a solid in water at a specific temperature
Watch the video carefully and write down your answers to the questions before revealing them by clicking on each questions in turn.