Get started!

Challenge
Answer 6 out of 8 questions correctly.

The instructions for how to carry out a science experiment can be found in an experimental

protocol.

An experimental protocol often includes the list of materials you need for the experiment. The protocol also includes the procedure, which is a list of steps for carrying out the experiment. Some experimental protocols include data tables for recording the results of the experiment.

The experimental protocol below is for an experiment about evaporation. This experiment looks at

salinity,

or the amount of salt dissolved in water. The experiment investigates how salinity affects evaporation. The experiment tests tap water, which contains very little salt, and water mixed with different amounts of table salt.

Read the experimental protocol, then answer the question below.

Materials:
2 large glass flasks
9 identical glass beakers
9 teaspoons of table salt
1 graduated cylinder
room temperature tap water

Procedure:
1. Measure and pour 650 milliliters of tap water into each flask. Use the graduated cylinder to measure precisely.
2. Add 3 teaspoons of salt to one flask and label the flask medium salinity.
3. Add 6 teaspoons of salt to the other flask and label it high salinity.
4. Swirl each flask until all the salt is dissolved.
5. Label three beakers very low salinity. Using the graduated cylinder, measure and pour 200 milliliters of tap water into each of these beakers.
6. Label three beakers medium salinity. Measure and pour 200 milliliters of the medium salinity solution into each of these beakers.
7. Label three beakers high salinity. Measure and pour 200 milliliters of the high salinity solution into each of these beakers.
8. Place all of the beakers next to each other in a warm, sunny area.
9. After three days, use the graduated cylinder to measure the amount of water remaining in each beaker.
10. Record your results in the data table.