Calculate the percentage by mass of each element in the following compounds: (A)magnesium oxide

(B)aluminum oxide

(C)magnesium sulfate

(D)limestone

(E)sodium chloride

(F)ammonium sulfate

(G)ethanedioic acid

(H)ethanoic acid

(I)Lead nitrate

(J)potassium hydrogencarbonate

Suppose you got a low yield of benzoin from your benzoin condensation reaction and thus only have 0.300 g of benzoin to use as the starting material for this reaction. how much concentrated nitric acid should you add? (concentrated nitric acid is 15.8 m). write your answer in the form x.xx ml

The is a particle with one unit of positive charge a. proton b. positron c. electron d. nucleus awnser quick it is a important science test!

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.