Copper is an example of a(n) select one: a. homogeneous mixture b. heterogeneous mixture c. compound d. element

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

A5.000 g sample of niso4 h2o decomposed to give 2.755 g of anhydrous niso4. what is the formula of the hydrate? what is the full chemical name for the hydrate? what is the molar mass of the hydrate? niso4•_h2o what is the mass % of water in the hydrate?

Aroller coaster is traveling at 13 mi./s when you purchase a hill that is 400 m long and down the hill exonerate at 4.0 m/s squared what is the final velocity of the posterior found your answer to the nearest number