If an iPhone its under privacy, then camera--there should be a list of apps that have requested access and you can turn that access on or off.

So here's my progress: openSSH totally worked, so I got it installed on the NAS, port forwarding working, everything talking. Only I can't actually log onto the Crashplan software to control it over there, because apparently I still don't have internet connectivity from the Drobo. Which makes sense, because I couldn't get the email notifications up and running either, but had just deferred that problem to deal with later.

I'm thinking maybe I have my default gateway, etc. set up incorrectly. That is to say, I have everything set up as zeros, because I thought that set of routing was all about the LAN, not about getting to the internet. If I change the settings to what my modem uses, then I can't access the drobo through the LAN at all. So I am at another impasse.

I realized that what I needed to do with my iphone is update the IOS. (Finally)

I'm trying to figure out how much of the chemical energy in methane (CH4) is due to the carbon atom and how much due to 4 hydrogen atoms. (I'm looking at process to make methane out of hydrogen. Because there are good reasons why hydrogen gas is far less usable for certain purposes than methane (natural gas) I'm trying to figure out how much more energy is in the methane than in the carbon alone. According to my handing chemical table of elements the energy of ionization for hydrogen 131 kJ/mole whereas the the same figure for carbon is 153. So if "energy of ionization" is what I'm looking for, then the methane molecule has 4.4 time the energy that if the carbon atom was just used in a coal substitute. But am I figuring this right? Is "energy of ionization" really what I'm looking for?

Hmm. I am not as up on my chemistry as I once was, but I think that your approach doesn't really work because it doesn't look at the actual combustion reaction itself. You need to compare the energy change of burning methane vs. the energy of burning pure hydrogen gas or pure carbon gas. I think. The issue is that plenty of energy will be locked on the products in either case, so it is the energy released by the process that is actually interesting.

I don't really remember how to do that though.

This might help: [link]

Gar, as Gris said, you have to look at the total energy of the reaction being carried out. If you burn methane, you also need oxygen as a reactant and you'll get carbon dioxide and water as products. The energy released from the reaction will be the difference between the total chemical potential energies of the molar quantities (the number of molecules of each compound required by the balanced reaction) of methane and oxygen, and the potential energies of water and carbon dioxide. The difference between the reactants and the products is the energy released (in this case) or absorbed.

If you want to look at the molecules themselves, it's not the atoms, but the breaking of the C-H and O=O bonds versus the formation of C=O and H-O bonds and the differences in bond energies among them.

If you need them, I can send you some of the powerpoint slides on the subject that I use in my introductory chemistry class.

Edit: I looked a Gris's link, and there's good basic information there. If you need more, feel free to email me.

I'm confused about you're trying to accomplish, Gar. Methane is pretty easy to come by, while hydrogen is fairly energy-intensive to produce.

(Completely OT but hi DX!)

Okay, now that it's not way past my bedtime, and now that I'm thoroughly awake, let's have another go at this.

I'm confused about you're trying to accomplish, Gar.

I think he's looking at something like the Sabatier reaction which is a way of producing methane from carbon dioxide and hydrogen gas.

Is "energy of ionization" really what I'm looking for?

No. As I garbled last night, the potential energy of a molecule depends on its bond energies, so C-H bonds for methane, H-H bonds for hydrogen, and so on. The reactant bonds break, the product bonds form, and the energy change that results is the difference between energy needed to break the reactant bonds and the energy released by forming the product bonds.

The thing to watch out for is that enthalpies are usually given in kilojoules per mole (KJ/mol). A mole is Avogadro's Number of molecules, so the mass of a mole of a substance (the molar mass) depends upon the mass of the molecule. The molar mass is the molecular weight expressed in grams. If you want to know the heat per gram of a substance, you need to divide the molar heats by the molar mass of the substance in question. I hope that helps.

Hi meara!