schmied/reid/hartford©2009
Pressure vs Temperature

Name _____________

all rights reserved
Reliability & Validity

Period _____

Experimental Scenario

Student #_____

Answer these questions in complete, quality and correct sentences reflecting the question on separate paper.

 

PRE LAB QUESTIONS

1. What is the Study Subject in this experiment?

 

2. Tell the Manipulated (experimental) variable in this experiment?

 

3. Describe the Responding (measured) Variable.

 

4. Create a properly formatted scientific question for this experiment. (ss, mv, rv)

 

5. Craft an appropriate prediction for this question. (If Then &endash; compare FORMAT )

 

6. Develop an appropriate hypothesis (prediction with a reason) for the above question. (If Then-compare Because (ss, mv, rv) FORMAT etc)

 

7. Identify the control trials. Tell why these are the controls.

a. Controls Part A

b. Controls Part B.

 

8. Identify the experimental trials. Tell why these are the experimental trials.

  a. Exp Trials Part A

b. Exp Trials Part B

 

POST LAB SECTION

9. Provide a complete, numbered list of all materials used in (Both Parts) of this experiment.

 

10. Tell at least 2 controlled variables for this experiment and tell how these are controlled.

 

11. Describe at least 2 potential uncontrolled variables that matter.

 

12. Identify 2 potentially critical sources of error in this experiment, tell what error category each fits into AND explain how each could occur.

 

13.Follow the format given to create a CQC Data Table for each experimental trial.

Additional Data Table Instructions
  • Please ensure you double check all calculations in each Data Table.
  • Put a "H" by the High (+ gain-loss) and a "L" by the Low ON BOTH DATA TABLES.

Part A Data Table One - Pressure vs Temperature (2L & Thermometer)

Lab #
Air Temp 2L bottle STP (ūC)
Air Temp 2L x 300 pumps (ūC)
+ Gain - Loss (ūC)
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Averages

Observers:

Operator:

Recorder:

Part B Data Table Two &endash; Pressure vs Temperature (VacuVin & Thermometer)

Lab #
Air Temp VacuVin STP (ūC)
Air Temp VacuVin x 60 pumps (ūC)
+ Gain - Loss (ūC)
1
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Averages

Observers:

Operator:

Recorder:

14. Calculate the range of temperature for each experiment.

a. Show work for Part A Data Table

b. Show work for Part B Data Table

 

15. Create a CQC Bar Graph using the High/Low/Avg temperature gain/loss AND range of data for both sets of experimental trials on ONE side by side bar graph.

Follow your instructor's Bar Graph example!!!!

 

16. Describe how the experimental design strengthened the reliability of each part of the experiment.

 

17. Explain how the design of this experiment strengthened the validity of the over-all experiment.

 

18. Tell what type of Relationship (Use the Investigative Process definitions HO to help!) is demonstrated in this lab & explain WHY you think this is so.

 

19. Develop a Conclusion for this experiment

a. Tell the question the class was investigating. (In this experiment the class….)

b. State the hypothesis that was being tested.

c. Tell if this hypothesis was Accepted or Rejected or if the results were Inconclusive.

d. Completely explain why you answered what you did in (c.above) using the data below:

PLEASE REMEMBER TO PROPERLY USE UNITS EACH TIME YOU QUOTE DATA.

i. Explain what was done in Part A of the experiment. Then, compare the average temperature gain/loss of these experiment trials to the average of the controls. Then tell the High, Low and Range of the data in Part A.

ii. Describe what was done in Part B of the experiment. Next, compare the average temperature gain/loss of these experiment trials to the average of the controls. Then tell the High, Low and Range of the data in Part B.

(Important data for students: The range of data in a set of experimental trials often reveals potential error. For example a large range might reveal uncontrolled variables (like a defective pump, or improper procedures), while a small range of data shows variables are tightly controlled. (all pumps working well, all teams carefully following same procedures).

e. Summarize the experiment. (should at least 6+ meaningful sentences!)

Be specific, use examples of data (units!). Be sure to address the following points:

i. The relationship between temperature and pressure show in this experiment.

ii. New learning about Experimental design

iii. Safety precautions followed.

iv. Anything else that would help an interested reader understand more about the experiment.

 

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