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Experimental Design, Variables, and Controls
Worksheet
Grade Level
Chemistry
11.7 Experimental Design, Variables, and Controls
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A dissolution calorimetry lab compares two salts but uses a nested foam cup for one salt and a thin plastic cup for the other. Why is this a design flaw?
A
The dependent variable is no longer temperature change
B
Cup type changes heat loss, so it is confounded with salt identity
C
Both salts must have the same formula
D
Changing cup type increases validity automatically
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