Extended Only
Ethanoic acid is a colourless liquid at room temperature. It has the typical acid properties and forms compounds called ethanoates.
A pure sample of ethanoic acid is slowly heated from 0 oC to 150 oC and its temperature is measured every minute. The results are represented on the graph below.
i) Name the change that occurs in the region D to E.
[1]
ii) What would be the difference in the region B to C if an impure sample had been used?
[1]
iii) Sketch on the graph how the line would continue if the acid was heated to a higher temperature.
[1]
iv) Complete the following table that compares the separation and movement of the molecules in regions C to D with those in E to F.
| C to D | E to F |
separation (distance between particles) |
|
|
movement of particles | random and slow |
|
Can particles move apart to fill any volume? |
|
|
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