Why might a scientist repeat an experiment if she did not make a mistake in the first one? A) Scientists who repeat experiments
make the most money. B) It helps ensure the results are consistent and repeatable. C) Repeating ensures the expected results match the hypothesis. D) It helps find portions that can be skipped with the same results.
The correct answer is B) it helps to ensure the result are consistent and repeatable.
Explanation:
Scientist generally repeat an experiment if he or she did not make a mistake in the first one to compare the results of two experiment, if there is no difference in the result or values obtainted from the observation of two experiment. he or she become sure that experiment was done in a right way because if there is some error made when experiment was carried out then the result of two same experiment would be different.
(a) (i) All the elements of a group have similar chemical properties because they have same no. of valence electrons in their outermost shell. (ii) All the elements of a period have different chemical properties because they have different no. of valence electrons in their atoms.
