1) which of the following is a reason to study chemistry?
a) being able to explain events in the natural world
b)learning how to interpret symbols in fined art
c)learning skills that will you translate languages
d)being able to identify and describe cloud formations

2)which of the following is an advantage of bioplastic?
a)melts at low temperatures
b)made from renewable sources
c)must be composted
d)often made from genetically modified crops

3) which of the following is an example of biotechnology?
a) a petroleum-based lubricant used in farming machinery
b) a driverless, solar-powered automobile
c) a robotic probe on mars that can detect water
d) a mechanical implant that delivers

Darla claims that the first periodic table developed by mendeleev was not completely accurate, so it is not useful at all. harmony argues that it establish the periodic table we use today, making it more credible. who is correct and why? darla is correct, because a model that has any mistakes should be thrown out. darla is correct, because a good model would not need to change. harmony is correct, because mendeleev’s model had all of the information correct in the first version. harmony is correct, because mendeleev’s model made predictions that came true.

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

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal