Brian's hypothesis states that "Sunscreen lotions with higher SPF (Sun Protection Factor) ratings are able to block larger UV radiations, hence, they provide better protection." Which of the following information can be used to test the hypothesis?
A A graph of the SPF ratings of various sunscreen lotions versus the absorbed UV levels
B. A table that contains the number of people using the sunscreen lotions and their UV levels.
c. An article that describes the amount of UV exposure per the location.
D. An online survey of people who use lotions on a regular basis.

Fission of uranium-235 products energy and a. isotopes of smaller elements b. isotopes of larger elements c. lighter isotopes of uranium d. heavier isotopes of uranium

Salicylic acid is a very important acid. it is used to synthesize the aspirin by treating with acetic anhydride. a 0.2015-g sample of salicylic acid was dissolved in a 100.00-ml volumetric flask, and the solution was diluted to the mark. a 10-ml aliquot of this solution was titrated with standard naoh (0.01130 + 0.2% n) to a phenolphthalein faint pink color end point at 19.81 ml. (a) (calculate the normality of the salicylic acid solution used in the titration. (b) assuming the salicylic acid is pure, what is the equivalent weight of the salicylic acid? practice problems for the final exam (continued) (c) (calculate the inherent error in the determination of the equivalent weight you calculated in part (b). use the following absolute errors in the equipment /glassware when calculating the inherent error. 5.00-ml pipet: + 0.02 ml 100-ml volumetric flask: + 0.08 ml analytical balance: + 0.2 mg 25-ml buret: + 0.03 ml

In salt water solution, the salt is the blank