Which statements best describe a composite material? Select all correct answers. A composite may have more desirable properties than its components.

Composites all contain carbon, which makes them lightweight.

Composites form hydrogen bonds, which makes them stronger than their components.

A brick made of mud and straw is an example of a composite; a brick made of mud is not.

Iknow #2 is d. i just need to know why

Consider the nuclear equation below. 239/94 pu—-> x+ 4/2 he. what is x?

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