CHEMISTRY COMMUNITY

Simone Seliger 1C

I got my question answered. Yes, they are different drawings of the same structure so either is acceptable (in case anyone else wanted to know)

Simone Seliger 1C

I am having the same problem :(

Simone Seliger 1C

I am confused on finding the Ecell value: they would have to give us each half-reaction cell potential but then how do we determine which is for the anode and which is for the cathode??

Simone Seliger 1C

I am confused on the correct drawing of the chair conformation for cyclohexane. There is the way that shows two clear points (one up, one down) and the way that has 2 reflecting lines. For example, #15 in the Ch.3 homework draws it the second way. Would drawing the first way (a full shape) be marked...

Simone Seliger 1C

Can someone help me with #3 I don't understand how both of them are nucleophiles? Are you referring to #6? Nucleophiles are species rich in electrons. For the benzene ring, this electron richness comes from its double bonds. For CH_{3}OCH_{3} the oxygen in the center of the compound can only be att...

Simone Seliger 1C

When there are two of the same molecules as the reactants of a reaction, they are written [A][A], which equals [A]^2. This would make the reaction second-order. However, if there are 2 different molecules, the reaction would be [A]^1[B]^1. Does this make it an overall first-order reaction?

Simone Seliger 1C

In this reaction mechanism, the answer key states that there are two intermediates and that the catalyst is OH-. But I remember learning that a catalyst is a molecule that is present in the beginning of the reaction and the end of the reaction (it is not used up). Based off of this knowledge, I wrot...

Simone Seliger 1C

Armani Dodson 1A wrote:Did you guys get any response ??? It still has the wrong lecture up.

I also emailed them and never got a response :(

Simone Seliger 1C

Madeline Fox 2B wrote:Can someone explain why question 10 is false? I thought half-lives are always the same.

I am also confused by this question. I know that the equation is second-order, but do not understand why the decomposition would take different amounts of time.

Simone Seliger 1C

Whoops! I meant Quiz 2 Preparation 2017. Question 5: "A reaction that has a very low activation energy ____" B) has a rate that does not change much with temperature

Simone Seliger 1C

Can someone please explain why the answer to #5 is B) has a rate that does not change much with temperature? I am confused on this concept. Thanks!

Simone Seliger 1C

The answer is actually explained as q_katana= (1.45kg)(473 J/kg*K)(25.0˙C- 314.0˙C) and they didn't convert into Kelvin because they are looking for the difference and it would be the same answer if it is in celsius or kelvin, but I feel like it should be converted just to be able to cancel out wit...

Simone Seliger 1C

I just want to get clarification on a voltaic cell: is it the method/diagram used in electrolysis? Where electrical energy is being converted to chemical energy? I am aware that a galvanic cell converts chemical energy into electrical energy, but the terminology of voltaic and electrolytic cell gets...

Simone Seliger 1C

Can someone verify that the equation needed to solve #12 is the one we learned for calculating standard free energy change? I am getting caught up in the wording: "Calculate the standard Gibbs free energy". Should I be using a different equation (even though we're given standard change in...

Simone Seliger 1C

Can someone verify that the equation needed to solve #12 is the one we learned for calculating standard free energy change? I am getting caught up in the wording: "Calculate the standard Gibbs free energy". Should I be using a different equation (even though we're given standard change in ...

Simone Seliger 1C

Thanks! That actually really helped.

Simone Seliger 1C

I am conceptually confused on how heat (a form of energy) can be transferred into or out of a system, yet there is no temperature change of that system. I do understand that temperature is the measure of thermal motion, not heat, but still need someone to clarify. Thanks!

Simone Seliger 1C

Ok, thanks so much.

I was confused because in my discussion my TA gave us a different value for enthalpy of fusion that we used in an example for water. It was 334 J/mol.

Simone Seliger 1C

What is the value 6.01 kJ.mol^-1 representing in this answer? It has the same units as Gibbs free energy, but when I looked in the index that value for H20 was way different. Shouldn't it be the heat constant for that molecule? And where can we find that value in the textbook?

Thanks!

Simone Seliger 1C

If you get the answer in kJ/mol then it is in standard heat capacity, which assumes it is per mole. If it is in kJ, then it is not in standard form and has been adjusted for the fact that the amount of the substance in question is greater or less than one mole. This would entail finding the moles of...

Simone Seliger 1C

In regards to the Ch.8 questions, is there any way to choose which of the questions to complete if time is an issue and completing all of the problems will be near impossible while also keeping up with the course (in order to maximize studying and time efficiency)?

Simone Seliger 1C

Of course, I was thinking that wasn't right when we were filming! Sorry for the mistake.

Simone Seliger 1C

This video covers the process of how to determine Lewis structures for both ionic and covalent bonds. It also explains the exceptions of the process, resonance, and formal charge.

Simone Seliger 1C

If you have an atom that has less than 8 protons and an atom with more than 8, how do you determine where the sigma and pi bonds go in the diagram? Which one trumps the other?

Simone Seliger 1C

The compound given is C(H2)3 with charge of 2-. Do we only draw bonds for connecting the 3 CH2 compounds to the central carbon? I first bonds for all of the atoms, but the solutions manual showed to do otherwise. Is that because molecular shape/resonance only depends on the central atom? If so, what...

Simone Seliger 1C

What are the bond angles for seesaw shape? Are they the same trigonal bipyramidal?

Simone Seliger 1C

How do you determine which atom of a compound to create a double bond? Is it the most electronegative atom?

Simone Seliger 1C

One of the quiz questions in the workbook asks to find the molecular formula of a given mass composition. It also provides the total molar mass. After many tries, I continue to get a start mole amount for one of the elements. Should I assume I am doing something wrong if one of the values is a decim...

Simone Seliger 1C

Okay. But why not just change the type of light (i.e., blue to purple light for a higher frequency and therefore more energy) instead of using photons?

Again, I am just curious despite knowing that photons are the way to go when solving these types of problems.

Simone Seliger 1C

Why is increasing the energy of light waves not enough to determine the emission of the electron from the metal in photoelectric effect?

CHEMISTRY COMMUNITY

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Re: Differentiation between drawn structures of chair conformation

Re: 2013 Final Q4 Part A

Re: Final 2013 Q3A

Differentiation between drawn structures of chair conformation

Re: Quiz 3 Winter 2017

Determining Overall Reaction Rate

Ch.15 Question 71

Re: 2/24/17 Bruincast

Re: Quiz 2 Winter 2017

Re: 2017 Quiz 2

2017 Quiz 2

Re: Practice Midterm Q3A Winter 2013

Clarifying what a voltaic cell is [ENDORSED]

Re: Quiz 1 Preparation Answers

Re: Quiz 1 Preparation Answers

Re: Clarification on heat transfer but no temp change

Clarification on heat transfer but no temp change

Re: Help With Question 8.39 [ENDORSED]

Help With Question 8.39 [ENDORSED]

Re: Reaction Enthalpies: When kJ and when kJ/mol?

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Re: The "Lewisiana" Purchase Video

The "Lewisiana" Purchase Video

Determine where sigma and pi bonds go in diagram

Ch.3 #95

Bond Angle of Seesaw shape

Determining atom to double bond with in Lewis Structure

Calculating molecular formula

Re: Importance of light waves versus quantized photons

Importance of light waves versus quantized photons