Lab Report: Photosynthesis
Name:
Purpose of this Lab
What is the goal of this lab?What question are you trying to answer, or what problem are you trying to explain?
Hypothesis
After reading the lab instructions (but before starting the lab) record your best educated guess about what will happen in the experiment. Explain what lead you to this hypothesis.
Experimental Design
List the materials used in this lab, and a brief explanation of the procedures you followed. (You do not need to retype the procedure; simply summarize your procedures). Add #’s where necessary.
Data
Experiment 1 Data and Observations
Step 4
Record the initial pH value of the water in the beaker:
Step 8
Record the pH value of the water in the beaker at:
1:00 pm:2:00 pm:
3:00 pm:
4:00 pm:
5:00 pm:
Step 12
Record the behavior of the glowing splinter after it’s placed in the test tube:
Record the duration of the burn:
Experiment 2 Data and Observations
Step 3
Record the initial pH value of the water in the beaker:
Step 7
Record the pH value of the water in the beaker at:
8:00 am:9:00 am:
10:00 am:
11:00 am:
12:00 pm:
Step 11
Record the behavior of the glowing splinter after it’s placed in the test tube:
Record the duration of the burn:
Experiment 3 Data and Observations
Step 3
Record your observations of the leaf after being removed from the boiling water and being dipped in ethanol:
What was accomplished by boiling the leaf in ethanol?
Step 5
Record your observations of the leaf after staining it with iodine:
What does this test indicate about the two sections of the leaf? In other words, what is present in most of the leaf that is absent in the area which was foil covered?
Experiment 4 Data and Observations
Step 3
Record the initial pH value of the water in the beaker:
Step 7
Record the pH value of the water in the beaker at:
8:00 am:9:00 am:
10:00 am:
11:00 am:
12:00 pm:
Steps 8, 11, and 15 (multiple trials)
Trial 1 / Trial 2 / Trial 3 / Trial 3Hot plate temperature / 25 degrees / 28 degrees / 31 degrees / 34 degrees
1pm pH value
2 pm pH value
3 pm pH value
4 pm pH value
5 pm pH value
Observations of splinter in test tube
Duration of burn
Conclusion
After conducting the experiment, how would you now explain the problem(s) or answer the question(s) raised when you described the purpose of the lab? Be sure to base your answer on the data you collected. Consider whether your conclusion is t he only explanation for the data you collected or if there could be alternate explanations.
Recall the discussion of the characteristics of life at the beginning of the class. What characteristic of life does this lab deal with?
Think About It
What is your familiarity with the terms infrared and ultraviolet? What uses and/or risks do they pose to humans?
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