#15 only Designing an Experiment: Chem. 1010 Lab D01 A. Remember, as one of the

Question

#15 only Designing an Experiment: Chem. 1010 Lab D01 A. Remember, as one of the first steps in planning your investigation, you may need to narrow your original question. B. Then write a hypothesis and design an experiment to answer the question. Be sure to include all the necessary parts of an experiment, such as naming the manipulated and responding variables and identifying the variables you will control. C. Write any operational definitions that are needed. Include a data table you could use for recording your observations. D. Report is to be typed in Times New Roman or Arial 12 font.

Explanation / Answer

the human nose is pretty variable

Some substance will not be detected by the nose or even procsses by the brain

Note that there are plenty of substances that might be detected down to ppm

ppm = parts per millin, typically milligrams of sample per liter of solution (air)

pp = parts per billion, typically in milligrams per cubic meter (air)

Examples of substances:

Acetaldehyde -- > 15-120 ppb

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