Which of the following statements best describes the relationship between elements and compounds?
a. atoms of more than one element can combine in different ways to form the same product.
b. a compound does not always have to contain the same number of atoms of each element.
c. the properties of compounds always resemble the properties of the elements of which they are made.
d. the properties of elements are much different from the properties of the compounds that they make up.

What happens when an acid dissolves?

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 a reaction (at equilibrium) that makes more moles of gas than it consumes, what is the effect of increasing the pressure?