A student listed the characteristics of chemical and nuclear reactions.
Chemical and Nuclear Reactions
c
D
A change in atomic number of elements The atomic number of elements remains
takes place
the same
Which of these statements best explains the identity of Reaction D?
B
1) It is a nuclear reaction because the atomic number remains the same when
the particles are emitted from the nucleus.
(2)
It is a nuclear reaction because the atomic number remains the same when
the number of valence electrons changes
It is a chemical reaction because the atomic number remains the same when
the number of neutrons and protons changes
4) It is a chemical reaction because the atomic number remains the same for all
elements while a rearrangement of atoms through bonding occurs
16
19
Question 19 (1 point)

Now consider the reaction when 45.0 g naoh have been added. what amount of naoh is this, and what amount of fecl3 can be consumed by it?

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

How many moles are in 7.2 x 10^23 carbon molecules? (*round to the nearest hundredth and include the unit "mol c" after your number) question 6 options: