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.