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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:
Measure and pour 650 milliliters of tap water into each flask. Use the graduated cylinder to measure precisely.
Add 3 teaspoons of salt to one flask and label the flask medium salinity.
Add 6 teaspoons of salt to the other flask and label it high salinity.
Swirl each flask until all the salt is dissolved.
Label three beakers very low salinity. Using the graduated cylinder, measure and pour 200 milliliters of tap water into each of these beakers.
Label three beakers medium salinity. Measure and pour 200 milliliters of the medium salinity solution into each of these beakers.
Label three beakers high salinity. Measure and pour 200 milliliters of the high salinity solution into each of these beakers.
Place all of the beakers next to each other in a warm, sunny area.
After three days, use the graduated cylinder to measure the amount of water remaining in each beaker.
Record your results in the data table.
Data table:
Volume of water (mL) remaining in each beaker after 3 days very low salinity medium salinity high salinity
What materials are required for this experiment? Select all that apply.
Look again at 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:
Measure and pour 650 milliliters of tap water into each flask. Use the graduated cylinder to measure precisely.
Add 3 teaspoons of salt to one flask and label the flask medium salinity.
Add 6 teaspoons of salt to the other flask and label it high salinity.
Swirl each flask until all the salt is dissolved.
Label three beakers very low salinity. Using the graduated cylinder, measure and pour 200 milliliters of tap water into each of these beakers.
Label three beakers medium salinity. Measure and pour 200 milliliters of the medium salinity solution into each of these beakers.
Label three beakers high salinity. Measure and pour 200 milliliters of the high salinity solution into each of these beakers.
Place all of the beakers next to each other in a warm, sunny area.
After three days, use the graduated cylinder to measure the amount of water remaining in each beaker.
Record your results in the data table.
Data table:
Volume of water (mL) remaining in each beaker after 3 days very low salinity medium salinity high salinity
Which of the following steps should you do before pouring salt water into the beakers? Select all that apply.
Look again at 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:
Measure and pour 650 milliliters of tap water into each flask. Use the graduated cylinder to measure precisely.
Add 3 teaspoons of salt to one flask and label the flask medium salinity.
Add 6 teaspoons of salt to the other flask and label it high salinity.
Swirl each flask until all the salt is dissolved.
Label three beakers very low salinity. Using the graduated cylinder, measure and pour 200 milliliters of tap water into each of these beakers.
Label three beakers medium salinity. Measure and pour 200 milliliters of the medium salinity solution into each of these beakers.
Label three beakers high salinity. Measure and pour 200 milliliters of the high salinity solution into each of these beakers.
Place all of the beakers next to each other in a warm, sunny area.
After three days, use the graduated cylinder to measure the amount of water remaining in each beaker.
Record your results in the data table.
Data table:
Volume of water (mL) remaining in each beaker after 3 days very low salinity medium salinity high salinity
Which variables are held constant in this experiment? Select all that apply.
Hint: Variables that are held constant are kept the same.
Look again at 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:
Measure and pour 650 milliliters of tap water into each flask. Use the graduated cylinder to measure precisely.
Add 3 teaspoons of salt to one flask and label the flask medium salinity.
Add 6 teaspoons of salt to the other flask and label it high salinity.
Swirl each flask until all the salt is dissolved.
Label three beakers very low salinity. Using the graduated cylinder,
measure and pour 200 milliliters of tap water into each of these beakers.
Label three beakers medium salinity. Measure and pour 200 milliliters of the medium
salinity solution into each of these beakers.
Label three beakers high salinity. Measure and pour 200 milliliters of the high salinity
solution into each of these beakers.
Place all of the beakers next to each other in a warm, sunny area.
After three days, use the graduated cylinder to measure the amount of water remaining in each beaker.
Record your results in the data table.
Data table:
Volume of water (mL) remaining in each beaker after 3 days very low salinity medium salinity high salinity
Which question can this experiment answer?
Look again at 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:
Measure and pour 650 milliliters of tap water into each flask. Use the graduated cylinder to measure precisely.
Add 3 teaspoons of salt to one flask and label the flask medium salinity.
Add 6 teaspoons of salt to the other flask and label it high salinity.
Swirl each flask until all the salt is dissolved.
Label three beakers very low salinity. Using the graduated cylinder, measure and pour 200 milliliters of tap water into each of these beakers.
Label three beakers medium salinity. Measure and pour 200 milliliters of the medium salinity solution into each of these beakers.
Label three beakers high salinity. Measure and pour 200 milliliters of the high salinity solution into each of these beakers.
Place all of the beakers next to each other in a warm, sunny area.
After three days, use the graduated cylinder to measure the amount of water remaining in each beaker.
Record your results in the data table.
Data table:
Volume of water (mL) remaining in each beaker after 3 days very low salinity medium salinity high salinity
Which question can this experiment answer?
Look again at the experimental protocol. Then answer the question below.
Materials:
9 identical glass beakers
2 heat lamps
1 graduated cylinder
1 ruler
room temperature water
Procedure:
Pour 200 milliliters of water into each beaker. Use the graduated cylinder to measure precisely.
Arrange the beakers in three groups of three beakers. Place each group of beakers on a separate table.
Place the beakers within each group right next to each other.
Label the first table no heat lamp. Do not place a heat lamp on this table.
Label the second table 12 hours/day. On this table, place one heat lamp 30 centimeters above the beakers.
Label the third table 24 hours/day. On this table, place the second heat lamp 30 centimeters above the beakers.
Turn on both heat lamps.
Wait 12 hours and then turn off the lamp on the table labeled 12 hours/day. Turn the lamp back on 12 hours later.
Repeat this pattern for three days.
Keep the other heat lamp turned on continuously for three days.
After three days, use the graduated cylinder to measure the amount of water remaining in each beaker.
Record your results in the data table.
Data table:
Volume of water (mL) remaining in each beaker after three days no heat lamp heat lamp on for 12 hours/day heat lamp on for 24 hours/day
Which of the following steps should you do after placing the heat lamps over the beakers? Select all that apply.