Search found 25 matches

by Uisa_Manumaleuna_3E
Thu Jan 23, 2020 7:12 pm
Forum: Phase Changes & Related Calculations
Topic: Adding and subtracting properties
Replies: 6
Views: 23

Re: Adding and subtracting properties

State properties, as said above, are not dependent on the "in between"; rather, we only focus on the initial and final measurements to make calculations and assumption. State properties include energy, pressure, volume, temperature, density and heat capacity Non state properties (or proper...
by Uisa_Manumaleuna_3E
Thu Jan 23, 2020 7:09 pm
Forum: Phase Changes & Related Calculations
Topic: Steam vs liquid
Replies: 7
Views: 26

Re: Steam vs liquid

It helps for me to understand why steam burns more than liquid water if I remember the graph he showed us in class. I think everyone else did a fantastic job already of explaining it, but when dealing with the phase changes, at least for me, it helped seeing the comparison of energy change water und...
by Uisa_Manumaleuna_3E
Thu Jan 16, 2020 3:16 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Calculating Q
Replies: 16
Views: 44

Re: Calculating Q

Q and K require aqueous solutions because their concentrations do change in the system depending on the rate of reaction
by Uisa_Manumaleuna_3E
Thu Jan 16, 2020 3:13 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE Tables
Replies: 4
Views: 30

Re: ICE Tables

You can usually tell if you have to make an ICE box because the question will specify an initial concentration of some sort ("x amount of moles was place into x amount of liters and allowed to reach equilibrium....") and then itll ask you for the equilibrium concentration. If you're ever a...
by Uisa_Manumaleuna_3E
Thu Jan 16, 2020 3:11 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Reaction Quotient
Replies: 11
Views: 27

Re: Reaction Quotient

Reaction quotient is just you looking at the same system, at a certain point in time, and comparing it to what it should be at equilibrium. If they match up, great! your system's chilling at equilibrium. If not, you can see the direction in which its progressing to equilibrium.
by Uisa_Manumaleuna_3E
Thu Jan 16, 2020 3:08 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: How to make ICE box
Replies: 15
Views: 85

Re: How to make ICE box

Pure liquids and solids are always left out. And to find the change column, its just -x/+x with the molar ratios considered
by Uisa_Manumaleuna_3E
Thu Jan 16, 2020 3:04 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Quadratic
Replies: 6
Views: 25

Re: Quadratic

Do yourself a favor and just practice the quadratic formula as much as you can. it just helps make it that much easier, solving everything
by Uisa_Manumaleuna_3E
Thu Jan 16, 2020 2:53 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Units in ICE Table
Replies: 8
Views: 35

Re: Units in ICE Table

Definitely use molarity which is moles/L. This is important because for the K and Q expressions work with concentrations and partial pressures, and for the most part the hypothetical experiments use varying volumes for their processes.
by Uisa_Manumaleuna_3E
Thu Jan 16, 2020 2:48 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Approximation
Replies: 2
Views: 11

Re: Approximation

I understand it as being less than 10^-3. It's a little tricky with 10^-4, but i think we're safe just saying that its less than 10^-3
by Uisa_Manumaleuna_3E
Thu Jan 16, 2020 2:47 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Approximation
Replies: 8
Views: 25

Re: Approximation

In class Dr Lavelle told us to use approximation for sure when K is less than 10^-3. But its a little tricky if we have 10^-4. Definitely use approximation with 10^-5, but its a little uncertain for 10^-4
by Uisa_Manumaleuna_3E
Thu Jan 09, 2020 7:22 pm
Forum: Ideal Gases
Topic: Ideal Gases
Replies: 3
Views: 15

Re: Ideal Gases

In terms of ideal gases, I just know we need it to make assumptions and judgments about what's happening to the gases during equilibrium. Someone else asked which gases were considered to be more "ideal" but I don't think we need to focus so much on the gases being ideal, rather we should ...
by Uisa_Manumaleuna_3E
Thu Jan 09, 2020 7:16 pm
Forum: Ideal Gases
Topic: kc to kp
Replies: 2
Views: 17

Re: kc to kp

I know that in the Video Modules and pre/post assessments, the questions make us convert the PV=nRT equation to show how we can get Concentrations from given pressure; and then in another question we convert the equation, but this time to get Pressure from given concentration. So I imagine that it i...
by Uisa_Manumaleuna_3E
Thu Jan 09, 2020 7:08 pm
Forum: Ideal Gases
Topic: R constant in PV=nRT
Replies: 9
Views: 36

Re: R constant in PV=nRT

You don't have to worry too much though about which one of the R constant values to use, because (like everyone else said) the units will match up to the one we're supposed to use. So if you end up plugging in one of the other R values to the equation, not all of the units will cancel out and your a...
by Uisa_Manumaleuna_3E
Thu Jan 09, 2020 7:03 pm
Forum: Ideal Gases
Topic: 5G.11
Replies: 6
Views: 21

Re: 5G.11

Just think of the Reaction Quotient like you proofing the equation. You do just calculate it the same way you find K (with the concentrations raised to the power of their coefficients), but you're trying to see if the value of Q, with the given concentrations, will give you K. Because if it gives yo...
by Uisa_Manumaleuna_3E
Thu Jan 09, 2020 6:56 pm
Forum: Ideal Gases
Topic: What is the Importance of homogeneous vs heterogeneous equilibria [ENDORSED]
Replies: 12
Views: 73

Re: What is the Importance of homogeneous vs heterogeneous equilibria [ENDORSED]

From what I understand, yeah, pretty much we learn homogeneous and heterogeneous to know what to include in the K or Q calculations. Because, really, we already recognize the phases of the molecules anyway, it just helps specifying where we include all the concentrations/partial pressures (as we do ...
by Uisa_Manumaleuna_3E
Thu Mar 16, 2017 1:49 pm
Forum: Ideal Gases
Topic: R constant
Replies: 2
Views: 536

Re: R constant

The R constant has a lot of different values and whatnot, but we mostly only use the first one, 8.314 J*K^(-1)*mol^(-1). I think we mostly use this one because we focus on primarily on energy change while the other R values pertain to volume in Liters. Joules and kilojoules are usually the units we ...
by Uisa_Manumaleuna_3E
Thu Mar 16, 2017 1:41 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Transition States
Replies: 2
Views: 322

Re: Transition States

Another way you can look at the differences between transition states and intermediates is in their role when it comes to writing out reaction mechanisms. Transitions states, when drawn out in mechanisms, usually show whatever compounds and elements in the reaction are reacting with one another and ...
by Uisa_Manumaleuna_3E
Wed Mar 15, 2017 6:38 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Calculating energy and Plotting Relative Energy differences
Replies: 1
Views: 310

Calculating energy and Plotting Relative Energy differences

I missed class the day we went over Ethane and Butane and how to calculate energy as a function of a dihedral angle (page 106 of the course reader). Can someone explain to me where we got the values plotted on the two graphs? Were they values we calculated in class? Or were they simply given to us?
by Uisa_Manumaleuna_3E
Wed Mar 15, 2017 6:19 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Two Step Reactions
Replies: 3
Views: 490

Two Step Reactions

small question on finding out which step of a reaction is the rate determining step.

The rate determining step IS the slowest step. Does that mean that this step takes more energy to be carried out in comparison to the faster step?
by Uisa_Manumaleuna_3E
Thu Feb 23, 2017 7:29 pm
Forum: *Enzyme Kinetics
Topic: Intermediates vs. Catalysts
Replies: 1
Views: 244

Intermediates vs. Catalysts

From what I heard in lecture intermediates have to be produced in the reaction and then used up. Whereas, catalysts are needed for the reaction to get started and then are somehow regenerated later in the reaction? Can someone verify that this is accurate for me? I don't want to go onto the next top...
by Uisa_Manumaleuna_3E
Thu Feb 16, 2017 9:03 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Homework Problems 17 and 19
Replies: 1
Views: 288

Homework Problems 17 and 19

Maybe I'm not reading the Course Reader correctly but I'm having a hard time figuring out the orders for each reactants just by looking at the initial concentrations and Initial rates given to us in the tables??? How do we know which two experiments to use when comparing the concentrations and tryin...
by Uisa_Manumaleuna_3E
Wed Jan 18, 2017 5:23 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Memorizing Enthalpies???
Replies: 2
Views: 350

Memorizing Enthalpies???

I was just wondering if we would have to memorize some standard reaction enthalpies for quizzes or the final? Maybe not for some of the intense or complex formations, but for things like the formation of water molecules maybe???

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