What is the percent composition by mass of nitrogen in the compound n2h4

What is the mass of 3.91 x10^24 sulfur atoms?

The ph of a fruit juice is 3.6. find the hydronium ion concentration, left bracket upper h 3 upper o superscript plus right bracket , of the juice. use the formula phequalsnegative log left bracket upper h 3 upper o superscript plus right bracket.

Josh is making homemade lollipops. the recipe calls for dissolving 400 g sugar in 100 g of water. his friend, alex, said that would never work because sugar's solubility is 204 g per 100 g of water at 20°c.

3. Which is held constant when a gas obeys Boyle's law? A. motion temperature B. pressure D. volume linetic molecular

Why is melting a physical property of the wax, but flammability is a chemical property?

The three major groups p On the periodic table are the

Which of the following has the greatest mass, in grams? a. 1 atom of lead (Pb) b. 0.5 mol copper (Cu) atoms c. 0.3 mol gold (Au) atoms d. 25 atoms of mercury (Hg)

Which one is not a sedimentery rock a.) sandstone b.) limestone c.) quartz d. (coal

Which group is more reactive than the alkaline earth metals?

Why do you not want any of the water on the outside of the test tube to drip off into the calorimeter?