How many atoms of hydrogen-1 are in a 1.007-g sample?

Match the scientist to his contribution to the atomic theory. Term Definition Rutherford A) Nucleus Bohr B) Electron energy levels Schrodinger C) Electron cloud and orbitals

Some chemical reactions absorb energy rather than release it. Which of these phenomena are caused by chemical reactions that absorb energy? If you're not sure, make a guess

Consider the chemical equation in equilibrium. 2H2 (g) + O2 (g) 2H2O (g) What will happen if the pressure of the system is increased? A. The reaction will not change. B. The reverse reaction will be favored. C. The reaction will stop completely. D.

Which are ways to pay for a college education? Check all that apply.

The equilibrium constant k for the synthesis of ammonia is 6.8x105 at 298 k. what will k be for the reaction at 375 k?

What mass of potassium chlorate would contain 40grams of oxygen?

Identical forces act for the same length of time on two different masses. The change in momentum of the smaller mass is A) smaller than the change in momentum of the larger mass, but not zero. B) zero.

How many nuclei of 238 92 U 92 238 U remain in a rock if the activity registers 290 decays per second? (Note that the half life of Uranium-238 is 4.468x109 years)

A base can neutralize an acid. true or false

Hydrochloric acid (12.0 ml of 0.233 m) is added to 296.0 ml of 0.0579 m ba (oh) 2 solution. what is the concentration of the excess h + or oh - ions left in this solution?