CHEMISTRY COMMUNITY

Spencer Peterman 3E

Double bonds get priority over substituents in having the lowest number.

Spencer Peterman 3E

It actually doesn't need to be the same group on both sides, you're just looking at which group has the highest priority on each side. Both CH₃ and CH₂CH₃ have a higher priority than H because C has a higher atomic number than H, so those are the groups you use to determine if it's cis or trans.

Spencer Peterman 3E

It's actually ΔG^° = -2.3030RTlogK_eq (note: log instead of ln). 2.3030 is the conversion between log and natural log, i.e. 2.3030log(x) = ln(x).

Spencer Peterman 3E

Rachel_Bressler_3I wrote:first compare the molar mass of the carbon molecules parallel to each other. If both of the highest priority are on the same side, it is cis, and if they are on opposite sides are trans.

I think it's the atomic number, not molar mass, of the atoms that are bonded to each carbon, right?

Spencer Peterman 3E

I think it's because a geometric isomer has the same connectivity as well as molecular formula. If you look at 2-Methyl-1-propene, the C atom on the right of the double bond does not have an H connected to it like 1-Butene does. I don't know if this is right but I think that makes the hybridization...

Spencer Peterman 3E

Spencer Peterman 3E

I think the two equations you're thinking of are actually ΔS = nCln(T₂/T₁) and ΔS = nRln(V₂/V₁). The first equation is used for changes in temperature while the second one is used for changes in volume.

Spencer Peterman 3E

The question is asking for the change in internal energy for the production of 1 mole of H 2 , while the equation involves 3 moles of H 2 . This means that you need to divide the whole reaction by three, giving: (1/3)CH 4 (g) + (1/3)H 2 O(g) --> (1/3)CO 2 (g) + H 2 (g) There are now 2/3 moles of gas...

Spencer Peterman 3E

Extensive properties are those that depend on the amount of substance in a system, such as mass, volume, enthalpy, and entropy. (Enthalpy and entropy being extensive is the reason why you need to multiply by the number of moles of each substance when you calculate ΔH rxn or ΔS rxn .) On the other ha...

Spencer Peterman 3E

The molar kinetic energy of a noble gas is equal to (3/2)RT (there's an explanation for this on pages 277-278 of the textbook), where R = 8.314 J/K/mol and T is the temperature in Kelvin. So for part (a) you would calculate (3/2)(8.314)(55.85+273).

Spencer Peterman 3E

How much do neutrons cost?

Nothing, they're free of charge.

Spencer Peterman 3E

What do you get when 6.02x10²³ mosquitoes bite you?

Molearia.

Spencer Peterman 3E

I think this response from another thread should help. Essentially you're finding what the concentration of BrCl would be if only 8.12% of it remains, then assuming that the concentration of the products increases by the same amount that the concentration of BrCl decreased by.

Spencer Peterman 3E

I don't know the precise answer, but on page 469 of the textbook it says that metals form basic oxides, while nonmetals (like sulfur) form acidic oxides.

Spencer Peterman 3E

That's actually (OH₂), not (OH)₂. OH₂ is another way of writing H₂O.

Spencer Peterman 3E

I'm pretty sure that you can skip the past quizzes (Fall 2014 and Fall 2015) entirely for the Quiz 2 prep because they seem to cover only chapter 4 material. The actual hand-in quiz that will be scored, along with Quiz 2 itself, only covers topics from chapters 2-3, so don't skip any questions on th...

Spencer Peterman 3E

I don't believe so, as those are chapter 4 topics, while Quiz 2 is only supposed to cover chapters 2 and 3.

Spencer Peterman 3E

What don't you understand about copper? It makes perfect cents.

CHEMISTRY COMMUNITY

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