CHEMISTRY COMMUNITY

LG2019

I also don't see ln(k2/k1) = Ea/R (1/T1 - 1/T2) on any of the equations sheets he's given us but I feel like it would be provided. I'm not sure though. Hope this helps!

LG2019

The only one I can think of is K = k/k'
equilibrium constant = rate constant of forward reaction / rate constant of reverse reaction

LG2019

Ok thanks!

LG2019

Do you know why that is the case?

LG2019

This is really helpful, thanks!

LG2019

Ok cool thanks!

LG2019

Great, thanks!

LG2019

Thank you!

LG2019

Just to clarify, if a compound is produced in one step and consumed in another step later on, it is an intermediate, and if a compound is consumed in one step and produced again in another step later on, it is a catalyst?

LG2019

Do rate laws depend on the stoichiometric coefficients of the reactants in the balanced chemical equation?

LG2019

Why does raising the temperature of a reaction increase the rate constant of the reaction with the higher activation barrier more than it will the rate constant of of the reaction with the lower energy barrier?

LG2019

Does a catalyst increase the rate of the reverse reaction too or just the forward reaction?

LG2019

Ok thank you all!

LG2019

So all liquids aren't included in the cell diagram or just H2O?

LG2019

What is the order for the cell diagrams including liquids?

LG2019

do we need to know how to draw proposed structures for activated complexes (like in 6E 15.85)?

LG2019

Based on electrochemical properties, how can we tell if a metal will dissolve in solution?

LG2019

ugh ur mind

LG2019

How is an electrolytic cell different from a galvanic cell?

LG2019

oops I meant thanks XD

LG2019

Ok thakns!

LG2019

I'm having trouble understanding what electrolysis is. Can someone please explain the significance of this process?

LG2019

What is an ion-selective electrode and why is it significant?

LG2019

Ok thank you!

LG2019

Thank you!

LG2019

Ok thanks!

LG2019

I know that P x delta V = delta n x R x T but how do you calculate delta n?

LG2019

What is reversible expansion and how does it differ from irreversible expansion?

LG2019

What is the definition of expansion work?

LG2019

I am plugging the values into the w = -nRTln(V2/V1) equation but am not getting the right answer. Are my values correct?
n = (1.79atm)(6.52L)/(8.3145)(305K) = 0.00460 mol
w = -(.00460)(8.3145)(305)ln(6.52/4.29) = -488J
The answer in the book is -326J

LG2019

Thank you!

LG2019

Ok thank you!

LG2019

For part (c) of 6C.19 why is HClO2 a stronger acid than HBrO2 if bromine has a larger atomic radius and is thus less electronegative?

LG2019

But to calculate pKa and pKb we need acidity and basicity constants. Will we be given those on the test?

LG2019

part (i) of problem 6B.7 from the 7th edition asks to find [OH-], pH, and pOH from [H30+]=1.50M. When you calculate the pH from [H3O+] you get -log[1.50] which is -0.176 The answer in the back of the book is 0.176 (no negative) so do you just have to change it to positive when you calculate a pH to ...

LG2019

Thank you!

LG2019

Will test 3 cover material covered in lecture on Monday (11/26)?

LG2019

Sigma bonds allow atoms to rotate freely, unlike pi bonds.

LG2019

Does this apply to electronegativity values as well? Do we need to know exact values for the test or just trends?

LG2019

A few of the homework questions gave you two compounds and asked you to determine which compound had bonds with greater ionic character. I just kind of estimated the electronegativity differences of the compounds using the periodic table, but I'm wondering if there's a better way to go about answeri...

LG2019

Do we need to know how to draw dipoles for the test?

LG2019

For question 2D.3 from the 7th edition, do you need to know the electronegativity values of the elements and calculate the differences in electronegativity in order to determine which compounds are primarily ionic?

LG2019

Why is interaction potential energy always negative?

LG2019

How do you predict an atom's electronegativity? Is it a periodic trend?

LG2019

What exactly does the term "dipole" mean?

LG2019

When there are electrons in the 4s or 4p orbitals, is the 3d sub shell not considered part of the valence shell?

LG2019

I'm having trouble understanding what a node is in relation to a wavefunction. Can someone explain this concept to me?

LG2019

In this problem from the seventh edition from the textbook, is the uncertainty in velocity 5 or 10, and why?

LG2019

The midterm only covers up to Wednesday's material, right?

LG2019

Why is the number of nodal planes equal to the value of l?

LG2019

I'm having trouble conceptually understanding the difference between shells, subshells, and orbitals. Can someone help me?

LG2019

I believe Professor Lavelle said that everything up to, and including, today's lecture material will be on test two.

LG2019

The photoelectric effect is significant because it demonstrates that light has particle-like qualities. It established that we can consider light as photons (packets) of energy where one photon interacts w/ one electron and each photon must have sufficient energy to remove each electron. This is why...

LG2019

This is really helpful, thanks! :)

LG2019

A free electron is one that is not bound to an atom, whereas a bound electron is one that is bound to the nucleus of atom. An important distinction is that free electrons are not apart of the quantum system, whereas bound electrons are.

LG2019

The debroglie equation is used to describe the wavelike nature of an electron. The equation is: wavelength = /mv
The equation can also be applied to larger objects like cars to see if they have measurable wavelike properties.

LG2019

So then what exactly are diffraction patterns and how do constructive and destructive interference affect them?

LG2019

So is the term 'formula units' only relevant when talking about compounds?

LG2019

Are our posts due by Friday or Sunday, typically?

LG2019

There cannot be more than one limiting reactant. There is no limiting reactant if both substances are completely used up.

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