Recent content by jewilki1

Classify each of the following as ionic or covalent. I did all but I am not really sure about this one. NH4NO3 I put covalent. Is this correct? Thanks

Could you check these? Which one of the following ions or molecules can act as a base? H2S NH4 ALH3 CH3 NH2 I chose H2S. Is this correct? Also I had to weire a resonable lewis structure for the molecule that has the following skeletal structure: O2NONO2 I wrote...

Indicate whether the following compounds are ionic or covalent? (NH4) 3 PO4 I put this one as covalent. Is this correct. Thanks a lot.

Write the reaction where the enthalpy change is the lattice energy for silver floride. Make sure you include the physical states. Ag F (ag) yields Ag Positive(g) + F negative(g) Could you please check this Thanks Could you help with this one: write the equation for the reaction...

Which element in each of the following sets would you expect to have the highest second ionization energy? How do I figure this out? a. Na, Mg, Al b. Na, K, Fe c. Li, Be, Mg Can you help me? Thanks

a. the first ionization energy of aluminum is 578 kJ/mol. How much energy is required to ionize one atom of Al? I put E= 578 kJ/mol . is this how to start? b. Write out balanced chemical equation that represents the first ionization of aluminum (you must include the physical states)...

I don't know how to do a and c, but I got the answer to b. IS b correct? and can you help with a and c. Thanks

I have the answer to this question but I am not exactly sure how I got it. Can you explain this to me and show me how to work it. a. When ultraviolet photons from the sun with a wavelength of 292 nm shine onto our skin they provide enough energy to break bonds in our DNA; this can result...

I really need help with this problem. I need to know how to work it and the answer. I am trying to review all these problems and they do not have answers. 2. It requires 242.7 kJ/mol to fragment Cl2 molecules into Cl atoms. What is the longest wavelength (in nanometers) of light that has...

7. A hydrogen atom makes an electronic transition from its n = 4 level to its lowest energy level. Calculate the change in energy of the hydrogen atom. E = (-2.18 x 10^-18 J) (1/1 -1/16) + 2.04378 x 10^-18 J Is this correct. If not, can you show me how to do it. Thanks for the help.

I need help with parts of this question. 6. The red light emitted from a Helium-Neon LASER has an energy of 3.15 x 10^-19 J. a. At what speed do "red photons travel? I need help with this one. B. calculate the wavelength of these photons. I got 6.31424 x 10^-7m. Is this correct...

when lightning occurs in the sky, energy is released through the electronic relaxation of nitrogen. This energy can be observed as visible light and can be heard as sound waves (thunder). If you were 10 km from the lightning strike, which wave would you observe first? You must justify your...

Sodium vapor lamps are widely used for lighting public areas such as parking lots by emiting 589 nm yellow light. a. how much energy is emitted by one excited sodium atom when it generates a photon? b. How much energy is emitted when 1.00 mole of sodium atoms each generate a photon? Can...

can anyone please help me with this?

equilibrium of coplaner forces I already did it that way using an example from the book and it does not come out right. I need this one done step by step, because it does not come out right. thanks