Josh was testing his hypothesis on increasing the rate of reaction in a chemical reaction. josh had two trials, one at room temperature and one using a hot water bath. he compared the data from his two trials and reached a conclusion. what was the major flaw in josh's experimental design?

The correct answer will be- the replication of the experiment or no trials.

Explanation:

A scientific experiment is performed to test the predicted hypothesis which represents the limited explanation of the natural phenomenon.

The scientific results are based on the sample size which should be large enough to reduce the rate of error and justify the results which could support the hypothesis.

Since in the given experiment, the trials of the experiment were few with no replicas therefore, it could cause problem while analyzing the results and will cause an error in the data.

Thus, the replication of the experiment or no trials is the correct answer.

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !