Consider a hydrogen atom in the ground state. What is the energy of its electron?

which is, - 2.1799 X10^-18 J

Now consider an excited-state hydrogen atom. What is the energy of electron in the n=2 level?

What is the mass in grams of 15 L of nitrogen gas at STP

If you have 6.02 x 10 ^23 molecules of water in a glass, how many moles do you have? •1 •2 •3 •4

Ozone is dangerous to human health only when it is found in the what?

What would be a simple way to block erosion

Researchers want to determine the best temperatures for storing batteries. Describe a possible experiment and list the variables to be controlled in the experiment. Be sure to identify the manipulated and the responding variables.

Complete the reactions to show how butanoic acid may be converted to phenyl propyl ketone.

As a sample of the radioactive isotope 131I decays, its half-life (1) decreases (2) increases (3) remains the same

How many Joules of energy are required to change 10.0 gram of ice at - 2.0 C to water at 20.0 C? (use your constants) 440 J 66,000 J 880 4220 J

Why are Van der Waals forces important? A) They determine how strong dipole moments will be in polar covalent molecules B) They are the strongest type of intermolecular force that can act on polar and non-polar molecules C) They are primary

When heat is added to or removed from a substance, it may change its state. What state will most likely result if heat is added to a liquid?