Search found 69 matches

by mbaker4E
Sat Mar 16, 2019 10:13 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Inert Conductor
Replies: 3
Views: 10

Re: Inert Conductor

To be on the safe side, you should always use Pt(s) when you are unsure, unless Hg is present in the first place.
by mbaker4E
Sat Mar 16, 2019 10:11 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius Equation
Replies: 3
Views: 18

Re: Arrhenius Equation

If you need to find frequency factor of collisions (A) and you are given activation energy (Ea) you would use the Arrhenius equation.
by mbaker4E
Sat Mar 16, 2019 10:05 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Galvanic Cells
Replies: 4
Views: 14

Re: Galvanic Cells

The anode is the one being oxidized, and the cathode is the one being reduced (an ox, red cat).
by mbaker4E
Sat Mar 16, 2019 10:03 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Platinum
Replies: 5
Views: 20

Re: Platinum

Since platinum is inert, it will not interfere with the overall redox reaction. Therefore it can be used in the place of a solid metal, transferring electrons from an aqueous solution to the cathode.
by mbaker4E
Sat Mar 16, 2019 10:01 pm
Forum: Administrative Questions and Class Announcements
Topic: LYNDON'S PORK RAMEN REVIEW
Replies: 37
Views: 1549

Re: LYNDON'S PORK RAMEN REVIEW

Thank you Lyndon!!
by mbaker4E
Sat Mar 16, 2019 10:00 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K and Kc
Replies: 6
Views: 35

Re: K and Kc

K and Kc can be the same thing, but Kc refers specifically to concentration while Kp refers to partial pressures.
by mbaker4E
Sat Mar 16, 2019 9:56 pm
Forum: Administrative Questions and Class Announcements
Topic: Deadline to post
Replies: 6
Views: 67

Re: Deadline to post

You should probably get your posts in before the final.
by mbaker4E
Sat Mar 16, 2019 9:54 pm
Forum: Administrative Questions and Class Announcements
Topic: Final
Replies: 18
Views: 138

Re: Final

I think Lavelle always has at least one question per larger section on his syllabus.
by mbaker4E
Sat Mar 16, 2019 9:53 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: [H2O] omitted??
Replies: 2
Views: 21

Re: [H2O] omitted??

Yes, because water is present in all aqueous solutions is it implied that it is already present.
by mbaker4E
Sat Mar 16, 2019 9:51 pm
Forum: First Order Reactions
Topic: Half-Lives
Replies: 4
Views: 27

Re: Half-Lives

Yes, you should definitely know how to use all the half-life equations because they are different for every order and can sometimes be useful in finding k.
by mbaker4E
Thu Mar 07, 2019 2:50 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Pt
Replies: 14
Views: 119

Re: Pt

You would add Pt(s) if there are no solids present on either the anode or cathode side.
by mbaker4E
Thu Mar 07, 2019 2:49 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Study Advice
Replies: 30
Views: 240

Re: Study Advice

I definitely recommend attending step-up sessions if you are completely lost and don't know where to start and need some momentum. Workshops are really good if you already have a basic handle on everything.
by mbaker4E
Thu Mar 07, 2019 2:45 pm
Forum: First Order Reactions
Topic: First order graph
Replies: 7
Views: 59

Re: First order graph

The x axis is time, usually in seconds but it can also be in minutes, days, etc.
by mbaker4E
Thu Feb 28, 2019 1:16 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: H2O in Cell Diagrams
Replies: 4
Views: 33

Re: H2O in Cell Diagrams

Correct, because if there are aqueous solutions already present it implies that water is present as well.
by mbaker4E
Thu Feb 28, 2019 1:15 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: speed of reaction based on activation energy
Replies: 6
Views: 43

Re: speed of reaction based on activation energy

Yes, because more energy is necessary in order for the reaction to move forward.
by mbaker4E
Thu Feb 28, 2019 1:13 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams
Replies: 3
Views: 44

Re: Cell Diagrams

If you are referring to Pt(s) or C(graphite), those elements are added to the cell diagram if there is no solid present in the original equation. This is because if you refer to the visual representation of the cell diagram, the anode and cathode require a solid metal to transfer electrons from one ...
by mbaker4E
Tue Feb 26, 2019 2:17 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: test 2
Replies: 6
Views: 75

Re: test 2

Yes, I am pretty sure he will provide a redox table if necessaary.
by mbaker4E
Tue Feb 26, 2019 2:16 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: E˚ vs E
Replies: 13
Views: 109

Re: E˚ vs E

I believe E˚refers to standard conditions and E refers to nonstandard conditions.
by mbaker4E
Tue Feb 26, 2019 2:13 pm
Forum: Administrative Questions and Class Announcements
Topic: Topics for Test2
Replies: 1
Views: 37

Re: Topics for Test2

I believe the test covers Gibbs Free Energy and Electrochemistry up until and not including the Nernst equation.
by mbaker4E
Sun Feb 17, 2019 5:37 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Work done vs work on system
Replies: 18
Views: 131

Re: Work done vs work on system

When work is done on a system, or by the environment, energy is added to the system and is thus positive. when work is being done by the system, energy is being used by the system and is thus negative.
by mbaker4E
Sun Feb 17, 2019 5:36 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: DeltaS= nCln(T2/T1)
Replies: 4
Views: 51

Re: DeltaS= nCln(T2/T1)

the question should always tell you if the system is at constant volume or constant pressure, in which you would use Cv and Cp, respectively.
by mbaker4E
Sun Feb 17, 2019 5:28 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Temperature
Replies: 2
Views: 25

Re: Temperature

If a reaction is endothermic, increasing temperature will favor the products while decreasing will favor the reactants. Conversely, if a reaction is exothermic, an increase in temperature will favor the reactants and a decrease in temperature will favor the products.
by mbaker4E
Thu Feb 07, 2019 1:37 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: when to solve for specific vs. molar heat capacity
Replies: 2
Views: 33

Re: when to solve for specific vs. molar heat capacity

Specific heat capacity is the heat requires to raise 1 gram of a substance by 1 degree Celsius/Kelvin, whereas molar heat capacity is the heat required to raise 1 mole of substance by 1 degree Celsius/Kelvin. Look and see if the problem gives you grams or moles, and go from there.
by mbaker4E
Thu Feb 07, 2019 1:32 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Bomb calorimeters vs polystyrene cup calorimeters
Replies: 3
Views: 44

Re: Bomb calorimeters vs polystyrene cup calorimeters

A bomb calorimeter measures heat flow at a constant volume, as you can imagine a bomb as a rigid chamber that cannot increase in volume. A polystyrene cup calorimeter on the other hand measured changes in temperature at a constant pressure.
by mbaker4E
Thu Feb 07, 2019 1:24 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Work
Replies: 4
Views: 45

Re: Work

When the work of the system on the atmosphere is positive, that means work is done by the system, and so the equation would look like delta U = Q - W. When the work of the atmosphere or environment on the system is positive, it means work is being done on the system, which would correlate with the e...
by mbaker4E
Fri Feb 01, 2019 10:53 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Heat vs. Temp
Replies: 9
Views: 193

Re: Heat vs. Temp

Heat refers to the transfer of energy between molecules which is why heat is measured in Joules, whereas temperature merely refers to the random motion of molecules.
by mbaker4E
Fri Feb 01, 2019 10:50 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Surroundings
Replies: 11
Views: 62

Re: Surroundings

The surroundings consists of everything outside of the system.
by mbaker4E
Fri Feb 01, 2019 10:47 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Closed System
Replies: 6
Views: 80

Re: Closed System

When dealing with closed systems, you are able to assume that the number of moles remains constant. This will in most cases allow for certain equations to be utilized (such as PV= nRT and certain calorimetry problrems) in order to solve for other components of the equations. Additionally, it is much...
by mbaker4E
Thu Jan 24, 2019 4:27 pm
Forum: Student Social/Study Group
Topic: ICE Table
Replies: 6
Views: 63

Re: ICE Table

You would only need to use an ICE table if you are specifically asked to get from initial concentrations to equilibrium concentrations or vise versa. Usually you can go through a problem and if you think you need ICE table then you can try it out but if you don't have enough information for it or it...
by mbaker4E
Thu Jan 24, 2019 4:22 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5% Rule and % Deprotonation
Replies: 3
Views: 49

Re: 5% Rule and % Deprotonation

Yes, they both use change in concentration over initial concentration times 100%
by mbaker4E
Thu Jan 24, 2019 4:20 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Tricks for identifying Strong/Weak Acids & Bases
Replies: 5
Views: 61

Re: Tricks for identifying Strong/Weak Acids & Bases

These are some general strong acids/bases I memorized:
Strong Acids - HCl, HBr, HI, HNO3, HClO3, HClO4, H2SO4
Strong Bases - LiOH, NaOH, KOH, RbOH, CsOH, Ca(OH)2, Ba(OH)2, Sr(OH)2
by mbaker4E
Tue Jan 15, 2019 4:41 pm
Forum: Ideal Gases
Topic: Homework for week 2 [ENDORSED]
Replies: 10
Views: 141

Re: Homework for week 2 [ENDORSED]

I think as long as you turn in work from either section you will be fine, such we are still going over both in lecture.
by mbaker4E
Tue Jan 15, 2019 3:52 pm
Forum: Ideal Gases
Topic: Water
Replies: 13
Views: 135

Re: Water

No, water cannot be aqueous since an aqueous solution is dissolved in water. That is why it is referred to as liquid.
by mbaker4E
Tue Jan 15, 2019 3:49 pm
Forum: Ideal Gases
Topic: pressure
Replies: 7
Views: 82

Re: pressure

If you look at the equation pV = nRT changing either temperature or inert gas (if volume remains constant) will change pressure.
by mbaker4E
Thu Jan 10, 2019 3:20 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Giving Qc or Qp when asked for Q
Replies: 5
Views: 52

Re: Giving Qc or Qp when asked for Q

If the problem has to do with concentration (Mol/L) Qc will be used. If the problem has to do with pressure or gas-state molecules, Qp will be used.
by mbaker4E
Thu Jan 10, 2019 3:17 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: how to write the formula for K
Replies: 6
Views: 54

Re: how to write the formula for K

You only use subscript for P when you are representing partial pressure, which will only be used in chemical equilibrium problems with gas state molecules.
by mbaker4E
Thu Jan 10, 2019 3:14 pm
Forum: Ideal Gases
Topic: Q and K [ENDORSED]
Replies: 35
Views: 885

Re: Q and K [ENDORSED]

There is no difference in the way we calculate Q and K, the difference is that Q is associated with initial values and K is associated with equilibrium values.
by mbaker4E
Thu Jan 10, 2019 3:11 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K, Kc and Kp
Replies: 8
Views: 60

K, Kc and Kp

What are the differences in using K, Kc and Kp? Are K and Kc interchangeable?
by mbaker4E
Thu Dec 06, 2018 8:36 pm
Forum: Conjugate Acids & Bases
Topic: Conjugate Bases
Replies: 7
Views: 88

Re: Conjugate Bases

If you have an acid, its conjugate base would be the result of losing a H+, and if you have a base, its conjugate acid would be the result of gaining an H+.
by mbaker4E
Thu Dec 06, 2018 8:33 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Focus 9C.3 Part d
Replies: 3
Views: 54

Re: Focus 9C.3 Part d

I think the parenthesis are just to separate the two ligands.
by mbaker4E
Thu Dec 06, 2018 8:31 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination number
Replies: 1
Views: 42

Re: Coordination number

The coordination number would be 6 because a single edta compound forms 6 bonds to the Fe atom, as it is hexadentate, and the number of bonds that are formed to the central atom make up the coordination number. Similarly, the bidentate compound en can form two bonds with a central atom.
by mbaker4E
Tue Nov 27, 2018 8:34 pm
Forum: Dipole Moments
Topic: 4.29
Replies: 3
Views: 45

Re: 4.29

1 has the largest dipole moment because since the chlorines are positioned close to one side of the molecule, that side of the molecule will have a polarized charge in comparison to the other side with no chlorines. 3 has the smallest dipole moment because since the molecule is symmetrical, any char...
by mbaker4E
Tue Nov 27, 2018 8:29 pm
Forum: Dipole Moments
Topic: LDF
Replies: 5
Views: 55

Re: LDF

All molecules have LDFs because an LDF is just a weak, short-range electrostatic force between uncharged molecules, arising from the interaction of transient electric dipole moments. Any molecule, for example a nonpolar covalent molecule with normally no charge, can have its electrons positioned in ...
by mbaker4E
Tue Nov 27, 2018 8:22 pm
Forum: Dipole Moments
Topic: Dipole-Dipole
Replies: 3
Views: 48

Re: Dipole-Dipole

Usually, if a molecule is asymmetrical or has lone pairs of electrons then it will be polar. If two polar molecules come together, they can form a dipole-dipole interaction from the partially positive side of the molecule attracting a partially negative side of another polar molecule.
by mbaker4E
Tue Nov 20, 2018 12:50 am
Forum: Bond Lengths & Energies
Topic: VSEPR
Replies: 6
Views: 105

Re: VSEPR

When first learning VSEPR shapes I would recommend googling "VSEPR Geometry" in images and going off of that table until you memorize the shapes because it it very easy to follow. Steric number refers to how many bonds (single, double, or triple) AND electron pairs surround the shape.
by mbaker4E
Tue Nov 20, 2018 12:45 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular shape on test
Replies: 5
Views: 77

Re: Molecular shape on test

My TA specified that only one-dimensional Lewis structure diagrams will be necessary for 14A, and shape should be known but does not need to be drawn out.
by mbaker4E
Tue Nov 20, 2018 12:43 am
Forum: Administrative Questions and Class Announcements
Topic: Discussion
Replies: 6
Views: 107

Re: Discussion

I don't think any discussions are cancelled except for those on the official days off (thursday and friday)
by mbaker4E
Tue Nov 20, 2018 12:33 am
Forum: SI Units, Unit Conversions
Topic: Significant 0’s
Replies: 4
Views: 116

Re: Significant 0’s

You can tell significant 0's by whether or not they contribute to the number's specificity. For example, 0.0850 is more specific than 0.085 because the latter is rounded, but 0.0085 is not a more specific version of 0.0850, it is just an entirely different number.
by mbaker4E
Wed Nov 14, 2018 4:19 pm
Forum: Octet Exceptions
Topic: Resonance Structures
Replies: 7
Views: 120

Re: Resonance Structures

When asked to draw resonance, you should always draw all possible structures and then a combination of all those structures as the hybridization of those structures.
by mbaker4E
Wed Nov 14, 2018 4:14 pm
Forum: Properties of Electrons
Topic: Polar vs Non polar
Replies: 11
Views: 218

Re: Polar vs Non polar

The molecule will most likely be polar if there are different atoms around the central atom. A molecule will most likely be nonpolar if the molecule is symmetrical and has the same atoms around the central atom.
by mbaker4E
Wed Nov 14, 2018 4:11 pm
Forum: Administrative Questions and Class Announcements
Topic: Grades
Replies: 5
Views: 108

Re: Grades

If he does curve it, it will only help your grade. I don't think this class will be curved by much though.
by mbaker4E
Tue Nov 06, 2018 12:20 am
Forum: Octet Exceptions
Topic: Octet rule vs. Formal charge
Replies: 7
Views: 101

Octet rule vs. Formal charge

What is more important when drawing a Lewis Diagram of the lowest energy - the octet rule or formal charge?
by mbaker4E
Tue Nov 06, 2018 12:19 am
Forum: Octet Exceptions
Topic: Octet Exceptions
Replies: 4
Views: 46

Octet Exceptions

How do you know if an element is an exception to the octet rule?
by mbaker4E
Tue Nov 06, 2018 12:09 am
Forum: Resonance Structures
Topic: Radicals
Replies: 11
Views: 171

Re: Radicals

An easy way to tell if a neutral molecule is a radical is to count up the number of valence electrons in each atom and add them together - if your number is odd then it is most likely a radical.
by mbaker4E
Tue Nov 06, 2018 12:06 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Lewis Structures
Replies: 1
Views: 45

Re: Lewis Structures

P in the center and 3 Ks branching out connected by single bonds, with a lone pair of electrons also attached to P. Every element is "happy" because K only has 1 valence electron and P has 5 valence electrons.
by mbaker4E
Tue Nov 06, 2018 12:01 am
Forum: Lewis Structures
Topic: Lewis Structure for N2O
Replies: 7
Views: 89

Re: Lewis Structure for N2O

Oxygen is more electronegative than nitrogen, thus nitrogen is the LEAST electronegative of the two and should be in the center.
by mbaker4E
Mon Nov 05, 2018 11:52 pm
Forum: Lewis Structures
Topic: BH4-
Replies: 2
Views: 43

Re: BH4-

You can definitely place the negative charge on the central atom, just make sure to change the charge of the entire molecule as a whole as well.
by mbaker4E
Mon Nov 05, 2018 11:50 pm
Forum: Trends in The Periodic Table
Topic: Electronegativity vs. Electron Affinity?
Replies: 9
Views: 153

Re: Electronegativity vs. Electron Affinity?

Electronegativity is how well an atom can attract electrons towards itself while electron affinity is the amount of energy released when an electron is added to an atom.
by mbaker4E
Sun Oct 28, 2018 2:33 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Ionization of elements
Replies: 3
Views: 69

Ionization of elements

Why do certain elements tend to have certain ions like Cu ---> Cu+ and Cu2+? but not Cu3+?
by mbaker4E
Sun Oct 28, 2018 2:24 pm
Forum: Trends in The Periodic Table
Topic: Smallest ionic radius [ENDORSED]
Replies: 6
Views: 128

Re: Smallest ionic radius [ENDORSED]

Atomis radius increases down and to the left, and since they are all in the same Period you would check for which is closest the the right hand side to find the smallest.
by mbaker4E
Sun Oct 28, 2018 2:20 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Quantum Numbers n, l, and m
Replies: 5
Views: 104

Re: Quantum Numbers n, l, and m

Spin up is +1/2 and spin down is -1/2.
by mbaker4E
Sun Oct 28, 2018 2:16 pm
Forum: Lewis Structures
Topic: Electron configuration
Replies: 1
Views: 47

Re: Electron configuration

Electrons are always removed from the outermost shell because those are the electrons with the highest energy and are therefore the most unstable. 5s has more energy than 4d and therefore when Ru is ionized electrons are taken from the 5s orbital first.
by mbaker4E
Sun Oct 21, 2018 1:13 am
Forum: Einstein Equation
Topic: Joules per photon?
Replies: 5
Views: 152

Re: Joules per photon?

I'm pretty sure leaving it as Joules would be considered correct units.
by mbaker4E
Sun Oct 21, 2018 1:11 am
Forum: Properties of Electrons
Topic: Balmer vs Lyman Series [ENDORSED]
Replies: 5
Views: 65

Re: Balmer vs Lyman Series [ENDORSED]

Wavelengths in the ultraviolet band are always in the Lyman series and wavelengths in either the visible light spectrum or the solar spectrum are in the Balmer series.
by mbaker4E
Sun Oct 21, 2018 12:54 am
Forum: Properties of Light
Topic: De Broglie's equation
Replies: 6
Views: 96

Re: De Broglie's equation

Since light always travels at the speed of constant c, light is never at rest and therefore has zero rest mass. This is why photons have no rest mass and De Broglie's equation cannot be used.
by mbaker4E
Tue Oct 16, 2018 12:17 am
Forum: *Black Body Radiation
Topic: Black Bodies and Temperature
Replies: 1
Views: 93

Black Bodies and Temperature

Why is it that as the temperature of a black body increases, the wavelength at which the max intensity is found decreases?
by mbaker4E
Sun Oct 07, 2018 3:54 pm
Forum: Limiting Reactant Calculations
Topic: Textbook question M3 [ENDORSED]
Replies: 1
Views: 40

Textbook question M3 [ENDORSED]

When limestone, which is principally CaCO3, is heated, carbon dioxide and quicklime, CaO, are produced by the reaction CaCO3(s) --> CaO(s) + CO2(g). If 17.5g of CO2 is produced from the thermal decomposition of 42.73g of CaCO3, what is the percentage yield of the reaction? How would you go about fin...
by mbaker4E
Sun Oct 07, 2018 3:36 pm
Forum: Significant Figures
Topic: Rounding molar mass on the periodic table
Replies: 3
Views: 36

Rounding molar mass on the periodic table

Should you ever round molar mass from the periodic table based on sig figs or should you always use the given number without rounding?
by mbaker4E
Sun Oct 07, 2018 3:33 pm
Forum: Significant Figures
Topic: Sig Figs & Molar Mass
Replies: 4
Views: 52

Sig Figs & Molar Mass

When figuring out sig figs do you include the sig figs of the molar mass of an atom?

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