How many hydrogen atoms are in the following molecule of ammonium sulfide? (NH4) 2S

a. 2

b. 4

c. 8

d. 16

Who got credit for developing the periodic table

What is the formula unit for potassium sulfide

Which of the following best expresses the definition of an open system? Energy can enter or leave the system but matter cannot. Heat and matter are both able to enter or leave the system. Matter can enter or leave the system but energy cannot.

Describe the difference between a monoprotic acid and a triprotic acid. How does a triprotic acid generate hydrogen ions?

In which situation would the gravitational potential energy between you and earth be greatest? A. You are running down a hill B. You are running up a hill C. You stand at the top of a hill D. You stand at the bottom of a hill

How is wind deflation different from wind abrasion?

What is the pH of a solution with a hydronium concentration of 2.88 * 10-2 M?

Which of the following characteristics is fixed, or definite, for all states of matter? volume shape mass energy

Describe a change caused by kinetic energy as well as a change caused by potential energy.

Which is more concentrated, a solution (1) prepared by dissolving 21.0 g of naf (0.500 mol) in enough water to make 500 ml of solution or a solution (2) prepared by dissolving 10.5 g (0.250 mol) of naf in enough water to make 100 ml of solution?