CHEMISTRY COMMUNITY

Yang Chen 2E

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Yang Chen 2E

Isn't tert supposed to be "three"? (I'm thinking its like protein structures)

Yang Chen 2E

According to a person on Chemistry community, you solve this problem by deriving an equation using the Arrhenius equation and getting rid of A using this method: k/k' = (e^-Ea/RT)/(e^-Ea/RT') k/k' = e^(-Ea/RT + Ea/RT') ln (k/k') = -Ea/RT + Ea/RT' ln (k/k') = (Ea/R)(1/T' - 1/T) Why are we able to com...

Yang Chen 2E

When will the questions for the 7:30-9:00 review session be posted or will they be given during the session?

Yang Chen 2E

I am also curious if organic chemistry will be covered as I don't see it in the outline.

Yang Chen 2E

For question 7, if you were to follow the rule of significant figures for each calculation, the final answer should be -2.4. I got marked off a point since the more exact answer is -2.7. Is there any chance I could restore a point for this?

Yang Chen 2E

Just to be clear, given two half equations, the Cathode consists of the more electronegative atom right? Also, for all of the half equations, are the E(cathode)/E(anode) values flipped if we were to flip the sign of the equation?

Yang Chen 2E

Just to be clear, given two half equations, the Cathode consists of the more electronegative atom right? Also, for all of the half equations, are the E(cathode)/E(anode) values flipped if we were to flip the sign of the equation?

Yang Chen 2E

On the learning objectives for chapter 14, I've noticed this: Know the definition of the electromotive force (emf, ℰ) and why it represents the maximum
potential difference. Can someone please explain this?

Yang Chen 2E

I don't really get what the solution manual is saying in terms of this question. Why is OH- part of the product of the cathode? Is it because the cathode is the side with OH-?

Yang Chen 2E

"A balloon filled with gas is expanded to a larger volume and lower pressure while maintaining the same temperature." Is heat being transferred here? Can someone please explain why the answer is yes?

Yang Chen 2E

Are we supposed to know how many energy states a "unit" of vibrational energy adds on?

Yang Chen 2E

Does anyone know what the answer for this question would be in J/degrees C?

Yang Chen 2E

I don't think delta G will be zero as you said you are only referring to H2. Delta G can only be applied to processes like phase changes or reactions.

Yang Chen 2E

Does anyone know what the soluition manual's equation can be applied to or does it not exist in reality?

Yang Chen 2E

Usually vials are open systems because matter and energy can enter them due to lack of a lid. If there IS a lid however, it would be a closed system (unless that vial was in some sort of light blocking vacuum chamber).

Yang Chen 2E

What is the equipartition theorem by the way?

Yang Chen 2E

I'm not sure which forum to post this on so I will place this here. I'm a little confused about Exothermic vs Exergonic and Endothermic vs Endergonic. In my LS7A class, one of the questions stated that a reaction in an open system with a positive change in enthalpy is exergonic. I'm not sure as why ...

Yang Chen 2E

When the question asked for work, the answer was given in joules by multiplying the number by some sort of constant but it just asked for how much work takes place. I thought work was just supposed to be -(external pressure)*volume change?

Yang Chen 2E

This is what I wrote down: when all reactants and products are in their standard states at 1 ATM of pressure, the reaction enthalpy is called the standard reaction enthalpy (ΔH°) the standard reaction enthalpy for the formation of one molecule of a substance from its elements in their most stable fo...

Yang Chen 2E

Just to clarify, delta U is change in a system's internal energy right? I was looking through my notes and couldn't find a definition for it.

Yang Chen 2E

Basically a reversible process means that if an infinitely small change happens to a variable, the process can be reversed. Page 265 of the textbook goes into depth about this.

Yang Chen 2E

I'm still confused on the reason why there are two separate molar heat capacities. I know that substances expand when heated which would change the heat capacity assuming we have constant pressure, but what happens if we have a constant volume? How would having a constant volume affect molar heat ca...

Yang Chen 2E

Heat is dependent on the path that is taken to create it, so it is not a state property.

Yang Chen 2E

I'm still extremely confused on how gases could have multiple molar heat capacities. If you were to change the pressure or volume of a gas, you technically don't have to change the amount of moles of gas within the container right?

Yang Chen 2E

If you're looking at lewis structures, you can tell which one is an acid or base by following the lewis definition of acids/bases. Lewis acids will have electron pairs to donate while lewis bases will have electron pairs they can receive.

Yang Chen 2E

I think it has to do with the first being a weak acid, but the second one still counts as a weak acid. I'm not sure when we can omit or need to retain x.

Yang Chen 2E

I'm not sure what the number in from of the hybrid orbitals represent (eg 2sp). Why do lone electron pairs not have this number? Would we have to write these numbers for our tests as well since many of the homework problems don't seem to require it in the answer?

Yang Chen 2E

The question wants us to draw the lewis structure of CH2CHCN, determine the hybridization of the carbon atom orbitals, and determine the bond angles. I'm wondering if the double bond between the first and second carbon would cause the H-C-C bond angle to be more than 120 degrees and the H-C-H bond t...

Yang Chen 2E

Just to be clear, the lewis structure of OSbCl3 contains and expanded octet for Sb right? The answer key labels the Sb with a normal octet.

Yang Chen 2E

This is what I put down: Naming for coordination compounds involve the greek prefix(number of specific ligand)+ligand name for each ligand in alphabetical order, then transition metal cation name with roman numerals for oxidation state. If there are anions outside of the formula, you add the ion nam...

Yang Chen 2E

Acid rain changes soil pH and usually contains higher concentrations of solutes in the rain. Many different plants, especially ones that live in high rainfall areas, can't tolerate the pH change and the solute increase due to the way their roots work. This is because the solutes can build up in the ...

Yang Chen 2E

Oooooooh wait ok I made a mistake with the electron configuration. Thank you for correcting me.

FYI for anyone who's confused about the gold configuration, one of the 6s electrons jumps to the almost filled 5d orbital creating the 6s1.

Yang Chen 2E

In this question, they are asking to identify which orbital an electron will be removed from to form a +1 ion. It asked for Au but the answer key says the electron will be taken from the 6s orbital. Isn't gold supposed to have an electron taken from its 6d orbital? Is the answer wrong?

Yang Chen 2E

Is there a way to determine which spectral series to use for initial/ending energy levels and what are their initial/ending energy levels? Our textbook problems (1.15) require us to determine the series to do the problems and was wondering if there is a condensed version of all of the series we are ...

Yang Chen 2E

I would have to agree with the second post here. Consider the formula unit like a molecule and use the same method as you would for calculating the number of molecules.

CHEMISTRY COMMUNITY

Search found 36 matches

Re: study tips

Re: Naming Cycloalkanes

15.61 and Equation used to solve it

Friday 7:30-9:00 Session

Re: Organic Chem on Final

Midterm Question 7 Sig Figs

Anode vs Cathode and their Equations

Anode vs Cathode and their Equations

Electromotive force and Why is E a Maximum

HW 14.11 d

Test 1 Question 3b

Re: Entropy

9.43 HW

Re: H2(g) --> H2(g)

Re: 9.13 Equation Confusion

Re: Open, closed, or isolated test 1 question

Re: Equipartition Theorem

Exothermic vs Exergonic and Endothermic vs Endergonic

Homework 8.101d [ENDORSED]

Re: standard enthalpy of formation [ENDORSED]

Delta U

Re: Question 8.11 Reversible v Irreversible actions

Re: Different Molar Heat Capacities For Gases

Re: Heat Not a State Property

Different Molar Heat Capacities For Gases

Re: Lewis Structure in identifying Acid or Base

Re: Hw 12.55

Question 4.95

Homework 4.41

Homework 4.23

Re: Naming Conventions [ENDORSED]

Re: Acid Rain Damage [ENDORSED]

Re: Question 2.47d [ENDORSED]

Question 2.47d [ENDORSED]

Different Series Energy Levels [ENDORSED]

Re: Formula Units [ENDORSED]