CHEMISTRY COMMUNITY

Lydiaelson1C

Do we not need to indicate where the double bond is?

Lydiaelson1C

You are not integrating by first order. You are just integrating each side, keeping the nth order in the equation. It's just a calculous problem. You also know that rate=k*(concentration of reactant)^order#. Since A is your only reactant, and the problem says to find the rate in the nth order, you c...

Lydiaelson1C

In this specific question, we are looking to find Ka of HF. Since Ka has to do with the amount of HF that dissociates, we need the equation for dissociation of HF. This would be HF<-->H(+)+F(-). Normally, if looking to balance a normal redox or make a battery cell, we would want the Eo value to be p...

Lydiaelson1C

Could someone please explain why when you multiply a half reaction, the E does not change? I'm just confused why entropy and enthalpy change when the reaction is flipped or multiplied bye E does not. I know that there is a difference because S and H are thermo and E is electric, but I do not get why...

Lydiaelson1C

This question asks us to arrange CHF5, CF4, CH3F, and CH2F2 in order of increasing molar entropy. The answer says that CH3F < CH2F2 < CHF3 < CF4. I thought that the entropy was determined mostly by W, which is the number of different states to the power of the n particles. So Why is it that when CHF...

Lydiaelson1C

This question asks us to calculate the work done by steam. To do this, the answer uses w=-P(delta)V and PV=nRT to derive that w=-(delta)nRT. I'm confused as to how the delta is applied to nRT, as it doesn't seem to change any of the calculations. Can someone explain to me how the delta fits into nRT?

Lydiaelson1C

For part C of question 6 on the 2011 winter midterm, it asks to find G for the redox reaction. Could someone explain how to find the equation G=-nFE is found? Because I know that the equation of deltaG=-nFE is given, but why can it be changed from the change in gibbs free energy to the total gibbs f...

Lydiaelson1C

My TA for section 1C said our average was a 25/40, but I believe it varied by section

Lydiaelson1C

Honestly, the best way to find equations is to look at what you are given and what you need to find. Then, you should look on the equation sheet and pick out the equations that have these variables in them. If you do not know enough of the variables, typically you will need to use your givens in ano...

Lydiaelson1C

Throwback to 14A :)

Lydiaelson1C

If you look at the graph, blue represents solid, green represents liquid, and red represents gas. It is apparent when studying this graph that the gas form contains more energy than the liquid form, even at the same temperature. Because of this, there is more energy to be released by steam when it c...

Lydiaelson1C

Lily Kennedy and Lydia Elson video, lecture 3.

Lydiaelson1C

Generally, yes. A bigger difference in electronegativity indicates that the bond is more ionic. Since ionic bonds are known to have strong bonding characteristics, it makes sense that the more ionic a bond is, the stronger the bond.

Lydiaelson1C

My AP teacher taught that we should use the correct sig figs to answer part A, but use the full answer in further calculations (keeping in mind the final answer cannot have more than the two sig figs in the first answer). Is that correct, or would that mess up the final answer?

CHEMISTRY COMMUNITY

Search found 14 matches

Re: Q7A. 2011 Winter Final

Re: 2011 Final, Question 4A

Re: Midterm 2014 Question 8

E of a Redox [ENDORSED]

WInter 2013 Midterm Q5B

Winter 2013 Q3A

Winter 2011 Midterm Q6C

Re: Quiz 1

Re: Calculations

Re: Chemistry Jokes

Re: Steam Burns

VIDEO: Fall Midterm 2014 (3&4)

Re: Does a greater difference in EN correlate to a stronger

Re: How many sf to carry through in problems with multiple p