CHEMISTRY COMMUNITY

Brandon_Phan_3J

Question 8C asks you to draw the most stable conformation possible for cis-1-ethyl-2-methylcyclohexane and the answer shows a chair structure with an axial 2-methyl group and an equatorial 1-ethyl group, if I drew a chair structure with an equatorial 2-methyl group and an axial 1-ethyl group would t...

Brandon_Phan_3J

Saw that this question was answered before: viewtopic.php?t=5476, hope this helps!

Brandon_Phan_3J

I think you can consider a staggered conformation another low energy conformation if you compare it to an eclipsed conformation.

Brandon_Phan_3J

If all the good chemistry jokes argon then we should probably zinc of new ones

Brandon_Phan_3J

A catalyst just provides a different pathway for the reaction to occur at a lower activation energy, this will not affect the value of the equilibrium constant.

Brandon_Phan_3J

Yeah I'm pretty sure you're right!

Brandon_Phan_3J

I could be wrong but I don't think the placement of the aqueous ions matter in terms of which one comes before or after matters. As long as you have the rest of the notation down: (solid being oxidized | aqueous ions in anode beaker || aqueous ions in cathode beaker | solid being reduced), the aqueo...

Brandon_Phan_3J

I saw that this was a question already answered: viewtopic.php?t=12118, hope this helps!

Brandon_Phan_3J

If you have a system where delta G = 0, the system is at equilibrium. In order for the reaction to be a spontaneous process delta G of the system must be negative/delta S universe is positive.

Brandon_Phan_3J

Not sure if I'm understanding the question correctly, but I think you might be mixing up another concept with Hess' Law. Maybe in the question you were referring to the H2 was cancelled out during the process of manipulating the multi-step reactions to match the net reaction? Hope this helps

Brandon_Phan_3J

I believe the answer is negative because the formation of water by its elements is exothermic, and yes because delta H is negative, it would imply that the reaction is exothermic. Hope this helps!

Brandon_Phan_3J

We know that Ag+ is a Lewis acid because it can act as an electron pair acceptor. For example, in a reaction where ammonia reacts with a silver ion to form a silver diamine ion, ammonia would act as an electron pair donor to the silver ion, making the silver ion an electron pair acceptor (aka. a Lew...

Brandon_Phan_3J

In the equation Kw = [H30+] [OH-], the value 1.0 x 10^-14 is the value for Kw (equilibrium constant for water), it is equal to the product of the molar concentrations of hydronium and hydroxide ions and applies to parts a through c for question 12.21.

Brandon_Phan_3J

I think I understand what you're asking but I think the change in molar concentration just depends on the number of moles each molecule has. For example, with the reaction 2N2 + O2 <-> 2N2O, the change in concentration for N2 would be 2x because it has two moles, x for O2 since it only has one mole,...

Brandon_Phan_3J

I believe a chelating complex is a structure that has molecules that can form several bonds to a single metal ion. In question 17.35, only (b) would be considered a chelating complex because (a) and (c) have NH3 in positions where they wouldn't be able to bind to the metal ion more than once. Hope t...

Brandon_Phan_3J

I think where you might have made an error was how you drew the lewis structure of SF4. Since SF4 has an expanded octet, it would have one lone pair around the central sulfur and it would have a see-saw molecular shape, not a tetrahedral shape (which would indicate a nonpolar molecule). Since SF4 ha...

Brandon_Phan_3J

I think what Prof. Lavelle said was that we didn't need to know exact bond angles but we should be able to predict if they're greater or less than the common bond angles (90°,120°,180°). Hope that helps!

Brandon_Phan_3J

I think in simpler terms they're just asking you to write the chemical formula of magnesium arsenide. To do so, you need to know the charges of the two ions that make up the compound; in this case, you need to figure out the charge of a magnesium (Mn) ion and an arsenic (As) ion. Looking at the peri...

Brandon_Phan_3J

b) The relationship between the angular momentum quantum number (L) and the magnetic quantum number (m sub L) is that m sub L can take on values of L, L-1,..., -L. Since the question is asking for m sub L values for an electron in a 6d subshell, that would mean that L=2. Because we know that L=2, we...

Brandon_Phan_3J

I think the energy of the incident light is referring to the threshold energy added with the kinetic energy. In the course reader, the formula is E(photon) = threshold energy + Ek; E(photon) refers to the energy of the incident light and Ek refers to the kinetic energy. Hope that helps!

Brandon_Phan_3J

I think the rounding might've thrown off your answer because when I used the value 2.998 x 10^8 m/s for the value for the speed of light, I got v = 1.1992 x 10^17 s. And if you use 6.626 x 10^-34 J as the value for planck's constant and multiply that by the frequency value you should end up with E =...

CHEMISTRY COMMUNITY

Search found 21 matches

Winter 2011 Final Q8C

Re: Final 2014 Q3

Re: gauche and anti

Re: Post All Chemistry Jokes Here

Re: Catalysts and equilibrium constant

Re: Reaction Rate Constant Units

Re: Writing Cell Diagrams

Re: Chapter 14 Question #85

Re: Spontaneity

Re: Hess's Law

Re: Specific heat capacity [ENDORSED]

Re: 12.13

Re: Homework Help 12.21

Re: Ice Box Change in Concentrations

Re: 17.35

Re: Polar/Non Polar 4.25d

Re: Do we need to know exact bond angles?

Re: HW 3.25 part a

Re: Question 2.19 part b and c [ENDORSED]

Re: Given the kinetic energy, how do you find the energy? [ENDORSED]

Re: Chapter 1 homework question