Lesson 30 How do I handle the data?
Unit 30 Worksheet 2 Handling data
2 Chemical Reactions
Your science teacher is demonstrating a chemical reaction.
The reaction is between two chemicals and at different temperatures. When the two chemicals are mixed the liquid turns black.
The reaction is complete when the mixture suddenly turns clear and colourless. You record the time the reaction takes, in seconds.
The teacher first mixes the same amounts of the two chemicals. Here is the data for different temperatures:
| Temperature (oC) | 20 | 30 | 40 | 50 | 60 | 70 |
| Time in seconds | 230 | 115 | 58 | 28 | 14.5 | 7 |
The teacher then doubles the amount of the first chemical, keeping the amount of the second the same.
Here is the data for this experiment:
| Temperature (oC) | 20 | 30 | 40 | 50 | 60 | 70 |
| Time in seconds | 116 | 59 | 29 | 15 | 6.5 | 3.5 |
How should you present the data for both experiments?
Remember you want to show as much as possible of the meaning of the data, so you need to think about both the temperature and the change in amount of the first chemical.