Search found 68 matches

by alanaarchbold
Thu Mar 14, 2019 11:57 pm
Forum: General Rate Laws
Topic: Final Equations
Replies: 4
Views: 65

Final Equations

Are there any equations that won't be given on the formula sheet that we have to memorize?
by alanaarchbold
Thu Mar 14, 2019 11:25 pm
Forum: General Rate Laws
Topic: Determining rate order
Replies: 3
Views: 61

Re: Determining rate order

You determine the order of one reactant each time so you want to pick the experiments where the only variation is the concentration of the reactant you are studying. But say like in 6th edition 15.19 the solutions use experiments 2 and 3, when the concentration of 2 is equal to the concentration of...
by alanaarchbold
Thu Mar 14, 2019 11:18 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: 6th edition, 15.63
Replies: 2
Views: 41

Re: 6th edition, 15.63

I also can't figure this out but it's clear that the solution is flawed because it also says 37'C is equal to 3130 K
by alanaarchbold
Thu Mar 14, 2019 11:10 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: A in the Arrhenius Equation
Replies: 4
Views: 49

Re: A in the Arrhenius Equation

A is just the frequency factor. Basically, if A increases the rate will increase. If you're looking at a plot, lnA is the b in y=mx+b, or the y-intercept.
by alanaarchbold
Thu Mar 14, 2019 11:06 pm
Forum: General Rate Laws
Topic: slow/fast steps
Replies: 7
Views: 76

Re: slow/fast steps

my TA said it will tell us
by alanaarchbold
Thu Mar 14, 2019 11:03 pm
Forum: *Enzyme Kinetics
Topic: Adsorption
Replies: 11
Views: 353

Re: Adsorption

Would an adsorption catalyst work differently in an equation? Or should I just know what it is compared to absorption
by alanaarchbold
Thu Mar 14, 2019 10:58 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Overall Order
Replies: 5
Views: 125

Re: Overall Order

It helps for when you're finding the units for k because the units are M^(1-n) x t^-1 where n is the overall order
by alanaarchbold
Thu Mar 14, 2019 10:52 pm
Forum: General Rate Laws
Topic: Final
Replies: 9
Views: 147

Final

Did Lavelle say how harshly he will grade on units/sig figs on the final?
by alanaarchbold
Thu Mar 14, 2019 10:51 pm
Forum: General Rate Laws
Topic: Determining rate order
Replies: 3
Views: 61

Determining rate order

How do you know which experiments to use in those charts to determine the orders for each reactant?
by alanaarchbold
Thu Mar 07, 2019 9:31 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Test 2
Replies: 4
Views: 94

Test 2

What was the right answer for the gibbs free energy question on test 2 about rusting? like if it was spontaneous or not? and why?
by alanaarchbold
Thu Mar 07, 2019 9:30 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Test 2
Replies: 4
Views: 117

Test 2

Can someone list the steps for the pH question from test two please
by alanaarchbold
Mon Feb 25, 2019 7:31 pm
Forum: Balancing Redox Reactions
Topic: Friday lecture
Replies: 1
Views: 37

Re: Friday lecture

since the anode was reversed and the sign changed, we add -.34 and .77. However, if we didn't reverse it, it would be .77-.34, which would give the same answer. Basically, if you use the voltage from the original voltages given, you subtract it. If you use the reverse anode reaction voltage, you add...
by alanaarchbold
Mon Feb 25, 2019 7:24 pm
Forum: Van't Hoff Equation
Topic: Equilibrium
Replies: 3
Views: 114

Re: Equilibrium

it relates to equilibrium because K is the equilibrium constant. It helps to find the K at different temperatures.
by alanaarchbold
Mon Feb 25, 2019 7:19 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Pressure & K
Replies: 1
Views: 38

Re: Pressure & K

K will help tell us if the reaction is spontaneous, nonspontaneous, or at equilibrium, depending on its value. If you increase the partial pressure of the product, deltaG becomes more positive, and if you increase the partial pressure of the reactant, deltaG becomes more negative.
by alanaarchbold
Mon Feb 25, 2019 7:14 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Nernst Equation
Replies: 2
Views: 38

Re: Nernst Equation

it represents the number of moles. however, you find this by balancing the equation and taking the number of electrons into account so that it's balanced.
by alanaarchbold
Mon Feb 25, 2019 7:13 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams
Replies: 2
Views: 41

Re: Cell Diagrams

It's more based on the anode and cathode. So say you have Cu2+(aq) + 2Cr2+ (aq) ---> 2Cr3+(aq) + Cu(s). Since the Cr is the one losing electrons, it will be on the anode side and since Cu is gaining electrons, it will be on the cathode side. So it will look like: Pt(s) | Cr3+, Cr2+(aq) || Cu2+(aq) |...
by alanaarchbold
Mon Feb 25, 2019 7:07 pm
Forum: Balancing Redox Reactions
Topic: Balancing Electrons
Replies: 3
Views: 37

Re: Balancing Electrons

finding the number of electrons is based on the change in the molecules. So say there's Cu2+ and it becomes Cu3+, it will have lost an electron and it will look like Cu2+ ---> Cu3+ + e-. Thus, this is the anode and it lost one electron.
by alanaarchbold
Sun Feb 10, 2019 10:57 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Midterm [ENDORSED]
Replies: 48
Views: 892

Re: Midterm [ENDORSED]

I've never had Lavelle before and I was wondering whether the questions on midterms/finals are mostly math based/problem solving or are there conceptual questions asked as well? They're mostly math based/problem solving but there are still conceptual questions, they're just worth less points./A lot...
by alanaarchbold
Sun Feb 10, 2019 10:53 pm
Forum: Administrative Questions and Class Announcements
Topic: Chem 14 BL
Replies: 5
Views: 159

Re: Chem 14 BL

Should 14BL and 14C be taken at the same time to graduate on time?
by alanaarchbold
Sun Feb 10, 2019 10:51 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: conversions
Replies: 3
Views: 56

conversions

Will we have to memorize conversions such as 1 atm=101325 Pa?
by alanaarchbold
Sun Feb 10, 2019 10:49 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: answer format
Replies: 4
Views: 73

answer format

On the midterm does anyone know if we have to convert our answers for delta U into joules? Or can we leave it as L.atm?
by alanaarchbold
Tue Jan 29, 2019 10:00 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Lecture Question
Replies: 3
Views: 64

Lecture Question

In one of the examples from Monday's lecture, O2 didn't have any delta HF value. I was wondering why that is?
by alanaarchbold
Tue Jan 29, 2019 9:58 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 6th edition 8.31
Replies: 2
Views: 47

6th edition 8.31

How do you find the J/mol/degrees celsius number (sorry I forgot the name of it)? In this question that number was different for constant volume and fro constant pressure but how is it found? Thanks
by alanaarchbold
Sat Jan 26, 2019 5:02 pm
Forum: Phase Changes & Related Calculations
Topic: Modules
Replies: 17
Views: 204

Re: Modules

Do you guys know if he'll add modules for other topics?
by alanaarchbold
Sat Jan 26, 2019 5:00 pm
Forum: Phase Changes & Related Calculations
Topic: Severe burn from steam clarification
Replies: 5
Views: 67

Re: Severe burn from steam clarification

I don't know if I can explain this that well but think of it in terms of that graph Lavelle had on his presentation. It takes about 41 kJ for vapor to become a liquid at 100 degrees Celsius, but it's still at 100 degrees so it has to use even more energy to go to a lower temperature. Meanwhile, it d...
by alanaarchbold
Sat Jan 26, 2019 4:55 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: method 2
Replies: 2
Views: 43

method 2

In method 2 I just wanted to confirm. So when the bonds break on the reactant side that releases energy right? But then it requires energy to form the new bonds on the product side? Does it take the energy from the broken bonds and then is whatever that's left over the net enthalpy?
by alanaarchbold
Sat Jan 26, 2019 4:53 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: energy production
Replies: 4
Views: 91

energy production

Lavelle briefly talked about how one heartbeat takes 1 joule of energy. Does that energy come from the bonds breaking in glucose?
by alanaarchbold
Sat Jan 26, 2019 4:52 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: method 1
Replies: 4
Views: 59

method 1

In method 1, when adding the two equations do you cancel out molecules if there's one on the reactant side and one on the product side?
by alanaarchbold
Sat Jan 26, 2019 4:51 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: method 1
Replies: 3
Views: 53

method 1

In method 1 from the last lecture do the 2 NO's cancel each other out?
by alanaarchbold
Tue Jan 22, 2019 3:18 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: equations
Replies: 10
Views: 115

Re: equations

I meant like it would just say you have molecule A, B, and C. How do you know the equation for that if they just tell you what they are? Like how do you know A and B form C or if C breaks down to form A and B?
by alanaarchbold
Sun Jan 13, 2019 3:36 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: solids and liquids
Replies: 5
Views: 95

solids and liquids

Why don't the molar concentrations of solids and liquids change in a reaction?
by alanaarchbold
Sun Jan 13, 2019 3:33 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: concentration vs partial pressure
Replies: 2
Views: 32

concentration vs partial pressure

Would it be wrong if on a test we used concentration in the K equation if the reaction refers to gases? Or would we have to use partial pressure? (and vice versa for aqueous)
by alanaarchbold
Sun Jan 13, 2019 3:29 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: equations
Replies: 10
Views: 115

equations

For some of the homework questions, it would just say the molecules and not distinguish if they were reactants or products. This is stupid but how do we know which are reactants and which are products?
by alanaarchbold
Sun Dec 09, 2018 1:34 am
Forum: Lewis Acids & Bases
Topic: Acids and Bases affecting the pH
Replies: 1
Views: 97

Re: Acids and Bases affecting the pH

If you use a weak acid, it won't completely ionize in solution, so the pH will be higher
by alanaarchbold
Sun Dec 09, 2018 1:32 am
Forum: Electronegativity
Topic: Polarizing Power and Polarizability
Replies: 2
Views: 120

Re: Polarizing Power and Polarizability

I know that stronger polarizability has to do with size, so the larger the molecule, the stronger the polarizability. Since Mg2+ has lost two electrons, it'll be smaller than Li+ because that only lost one electron. And then since Br is further down on the periodic table it's larger than P, so it's ...
by alanaarchbold
Sun Dec 09, 2018 1:27 am
Forum: Conjugate Acids & Bases
Topic: Stability of Conjugate Base
Replies: 6
Views: 237

Re: Stability of Conjugate Base

If a conjugate base is more stable, the acid is more likely to donate a proton. So the more stable the conjugate base, the stronger the acid (because it'll donate a proton a lot easier).
by alanaarchbold
Sun Dec 09, 2018 12:10 am
Forum: Amphoteric Compounds
Topic: water
Replies: 4
Views: 127

Re: water

but why does water always seem to be in an equilibrium reaction? does it basically mean that if it's mixed with water it will always be switching back and forth between the reactants and products?
by alanaarchbold
Sat Dec 08, 2018 10:33 pm
Forum: Amphoteric Compounds
Topic: water
Replies: 4
Views: 127

water

Why are there double arrows in reactions with water?
by alanaarchbold
Sat Dec 08, 2018 7:54 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: pH
Replies: 5
Views: 159

pH

Does pH increase or decrease as H+ concentration increases and why?
by alanaarchbold
Sat Dec 08, 2018 7:51 pm
Forum: Naming
Topic: cis and trans
Replies: 4
Views: 81

cis and trans

Do we have to know what cis and trans is for naming? What is that if we do?
by alanaarchbold
Wed Dec 05, 2018 3:36 pm
Forum: Naming
Topic: Formula
Replies: 1
Views: 39

Formula

On the naming coordination compounds link it gives the structure for ethylenediaminetetraacetato but I was wondering what the formula for that is? Also, does anyone know if the test only uses the compounds from the naming coordination compounds link?
by alanaarchbold
Sun Dec 02, 2018 10:04 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: ionization of weak bases
Replies: 1
Views: 51

ionization of weak bases

Why aren't weak bases completely ionized in water?
by alanaarchbold
Sun Dec 02, 2018 10:02 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: charges
Replies: 1
Views: 53

charges

This is stupid but are the charges in acid and base reactions found from using formal charge?
by alanaarchbold
Sun Dec 02, 2018 10:00 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: calcium
Replies: 2
Views: 46

calcium

why is calcium oxide called quicklime and calcium hydroxide called slaked lime
by alanaarchbold
Sun Nov 25, 2018 5:02 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 3
Replies: 38
Views: 638

Re: Test 3

I think we need to be able to identify shapes so we might have to know the bond angles
by alanaarchbold
Sun Nov 25, 2018 4:59 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity
Replies: 3
Views: 78

Re: Polarity

I believe it's because it's t-bone shaped and the three dipoles don't cancel each other out, causing it to be polar
by alanaarchbold
Sun Nov 25, 2018 4:54 pm
Forum: Hybridization
Topic: Hw: Ch.4 #43 (6th Edition)
Replies: 1
Views: 22

Re: Hw: Ch.4 #43 (6th Edition)

I think s character is like how much s is in a hybridized orbital. So for example in an sp3 orbital, it's 25% s character and 75% p character.
by alanaarchbold
Tue Nov 13, 2018 2:53 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Biological Activity
Replies: 3
Views: 73

Biological Activity

How does the shape and conformation of a molecule determine its biological activity?
by alanaarchbold
Tue Nov 13, 2018 2:50 pm
Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
Topic: Shape and Boiling Point
Replies: 12
Views: 488

Shape and Boiling Point

What is the relationship between shape and boiling point? Like I know if it's rod-shaped there's a stronger interaction because of the larger distance, but what does that have to do with its higher boiling point?
by alanaarchbold
Tue Nov 13, 2018 2:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Names and Shapes of molecules
Replies: 2
Views: 27

Re: Names and Shapes of molecules

I think it will be however many he teaches us in lecture and I'm 99% sure they'll have to be memorized.
by alanaarchbold
Tue Nov 13, 2018 2:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Trigonal Bypyramidal
Replies: 1
Views: 52

Re: Trigonal Bypyramidal

I believe there are five bonds around the central atom and three of them are along the equator with 120 degree angles and the other two are at the axis with 90 degree angles i'm pretty sure.
by alanaarchbold
Fri Nov 09, 2018 10:00 pm
Forum: Resonance Structures
Topic: Resonance with formal charge
Replies: 6
Views: 195

Re: Resonance with formal charge

So formal charge doesn't really have anything to do with resonance?
by alanaarchbold
Fri Nov 09, 2018 9:58 pm
Forum: Lewis Structures
Topic: Lewis Structure
Replies: 10
Views: 166

Re: Lewis Structure

Make sure the element with the lowest ionization energy is in the center.
by alanaarchbold
Fri Nov 09, 2018 9:56 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Naming the shape
Replies: 6
Views: 216

Re: Naming the shape

I believe there are 5: linear, trigonal-planar, tetrahedral, trigonal-bipyramidal, and octahedral.
by alanaarchbold
Tue Oct 30, 2018 7:29 pm
Forum: Lewis Structures
Topic: Drawing Lewis Structures
Replies: 14
Views: 297

Re: Drawing Lewis Structures

Does resonance somehow affect the shape of structures?
by alanaarchbold
Tue Oct 30, 2018 7:28 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Layout
Replies: 3
Views: 120

Re: Midterm Layout

Since the test covers fundamentals, quantum, and bonding I think it will be similar to our usual tests where it's mostly free response with some conceptual questions
by alanaarchbold
Tue Oct 30, 2018 7:24 pm
Forum: Ionic & Covalent Bonds
Topic: 3.19 6th edition
Replies: 1
Views: 58

3.19 6th edition

I know it says to emit c on this problem but how would you find how many unpaired electrons there are for this problem?
by alanaarchbold
Sun Oct 28, 2018 5:38 pm
Forum: Properties of Electrons
Topic: Coulomb
Replies: 4
Views: 212

Coulomb

Can someone please explain what coulombic attraction is
by alanaarchbold
Sun Oct 28, 2018 5:34 pm
Forum: Ionic & Covalent Bonds
Topic: the Octet rule
Replies: 21
Views: 311

Re: the Octet rule

Wait what does hydrogen do in that situation?? Can you explain that better please
by alanaarchbold
Sun Oct 28, 2018 5:29 pm
Forum: Administrative Questions and Class Announcements
Topic: Grading
Replies: 3
Views: 116

Re: Grading

I don't know the answer to 2 and 3 but you check your grades by going to the study list and then going to chemistry and then click on grades
by alanaarchbold
Sun Oct 21, 2018 3:26 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: shells
Replies: 2
Views: 64

shells

How do you correlate x, y, and z when there are more than three magnetic quantum numbers?
by alanaarchbold
Sun Oct 21, 2018 3:19 pm
Forum: Properties of Electrons
Topic: Test on Wednesday
Replies: 3
Views: 166

Test on Wednesday

Will tomorrow's lecture information be on Wednesday's test?
by alanaarchbold
Sun Oct 21, 2018 3:18 pm
Forum: Properties of Electrons
Topic: Wave Model
Replies: 1
Views: 43

Wave Model

Can someone pls explain how the wave model shows that electrons have quantized energy states
by alanaarchbold
Sat Oct 13, 2018 2:54 pm
Forum: Properties of Light
Topic: Frequency Equations
Replies: 2
Views: 52

Frequency Equations

I know some people were saying that there's an equation that combines E=(-hR)/(n^2) and E=hV. Does anyone know what it is?
by alanaarchbold
Sat Oct 13, 2018 2:52 pm
Forum: Properties of Light
Topic: light frequency
Replies: 3
Views: 49

light frequency

I know he went over this but I still don't get it. Why are there bigger spaces between certain quantum levels? Like the space between n=3 and n=2 is bigger than the space between n=4 and n=3.
by alanaarchbold
Sat Oct 13, 2018 2:43 pm
Forum: Properties of Light
Topic: Grades
Replies: 2
Views: 71

Re: Grades

We don't know until end of quarter.

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