medium · Enhanced ACT science
A chemist tests a new catalyst to see if it speeds up a reaction. She runs one trial with the catalyst at 50^circC and one trial without the catalyst at 20^circC.
What is the primary reason the results are unreliable?
- A temperature of 50^circC is too hot for most tests.
- The catalyst was likely not a high-quality type.
- She only performed one trial for each condition.
- Two independent variables were changed at once.
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