It is often a "goodness of fit" test. This is a test of how well the observations match the frequencies that would have been expected on theoretical basis. The theoretical basis may simply be your hypothesis.
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For goodness of fit test using Chisquare test, Expected frequency = Total number of observations * theoretical probability specified or Expected frequency = Total number of observations / Number of categories if theoretical frequencies are not given. For contingency tables (test for independence) Expected frequency = (Row total * Column total) / Grand total for each cell
Chi-square is a statistic used to assess the degree of the relationship and degree of association between two nominal variables
for ex; design pressure in pipe 100bar,and what is test pressure in pipe
If someone gives you IQ test answers, why even take the test? The whole purpose is to find out how intelligent YOU are!
It can be used for that purpose.