Question 3
(3) A student conducted an experiment using four (4) different set-ups: P, Q, R and S. All set-ups contain water in containers made of the same materials. The table below shows the different conditions when she started each experiment.
| Conditions | P | Q | R | S |
| --- | --- | --- | --- | --- |
| Room temperature (°C) | 22 | 24 | 22 | 22 |
| Exposed surface area of water (cm²) | 100 | 100 | 50 | 100 |
| Volume of water (ml) | 150 | 150 | 150 | 150 |
| Temperature of water (°C) | 50 | 50 | 50 | 40 |
Which of the following set-ups are the best for the student to use to ensure a fair test to investigate how the rate of evaporation of water was affected by: [1.5 marks]
| Option | Room temperature | Exposed surface area of water | Temperature of water |
| --- | --- | --- | --- |
| A | P and Q | P and R | P and S |
| B | Q and R | R and S | P and Q |
| C | Q and S | P and S | Q and R |
| D | R and S | Q and R | P and R |
| Conditions | P | Q | R | S |
| --- | --- | --- | --- | --- |
| Room temperature (°C) | 22 | 24 | 22 | 22 |
| Exposed surface area of water (cm²) | 100 | 100 | 50 | 100 |
| Volume of water (ml) | 150 | 150 | 150 | 150 |
| Temperature of water (°C) | 50 | 50 | 50 | 40 |
Which of the following set-ups are the best for the student to use to ensure a fair test to investigate how the rate of evaporation of water was affected by: [1.5 marks]
| Option | Room temperature | Exposed surface area of water | Temperature of water |
| --- | --- | --- | --- |
| A | P and Q | P and R | P and S |
| B | Q and R | R and S | P and Q |
| C | Q and S | P and S | Q and R |
| D | R and S | Q and R | P and R |