Search found 22 matches

by EmmaSaid3C
Wed Mar 15, 2017 9:47 pm
Forum: Van't Hoff Equation
Topic: Van't Hoff Equation
Replies: 5
Views: 1092

Re: Van't Hoff Equation

I think that the best way to know when to use the Van't Hoff Equation is when you are given 2 equilibrium reactions at two different temperatures. It is part of the thermodynamics chapter and can be found on page 42 in the course reader.
by EmmaSaid3C
Tue Mar 07, 2017 6:57 pm
Forum: *Organic Reaction Mechanisms in General
Topic: exergonic/exothermic
Replies: 2
Views: 317

Re: exergonic/exothermic

An exergonic reaction is a reaction where energy is released and the standard change in free energy of the reaction is negative.
An endergonic reaction is a reaction where energy is absorbed and the standard change in free energy of the reaction is positive.
by EmmaSaid3C
Tue Feb 28, 2017 2:08 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Kinetics vs. Thermodynamics
Replies: 3
Views: 418

Re: Kinetics vs. Thermodynamics

Thermodynamic favorability is a function of the change in free energy (ΔG), while kinetic favorability deals with the things that impact the rate at which a reaction occurs.
by EmmaSaid3C
Tue Feb 21, 2017 9:30 pm
Forum: General Science Questions
Topic: Intro to Organic Chemistry
Replies: 9
Views: 1069

Re: Intro to Organic Chemistry

We should probably bring both the blue and green course readers just in case tomorrow, and then see if we need both for future lectures.
by EmmaSaid3C
Mon Feb 13, 2017 12:02 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagram Symbols
Replies: 4
Views: 450

Re: Cell Diagram Symbols

A single vertical line separates species that are in different phases. A double vertical line represents a salt bridge. A comma indicates that the species are in the same phase.
by EmmaSaid3C
Sun Feb 12, 2017 11:11 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Inert Metallic Components
Replies: 3
Views: 284

Re: Inert Metallic Components

You would use a metal component like platinum when none of the reactants or products in a half-reaction are solids. For example, in the half-reaction H2(g) --> 2H+(aq) + 2e- ,
neither side of the reaction (reactants or products) includes a solid, so a platinum electrode is required.
by EmmaSaid3C
Tue Feb 07, 2017 9:42 pm
Forum: Balancing Redox Reactions
Topic: Question 7 2013 Midterm
Replies: 2
Views: 258

Re: Question 7 2013 Midterm

10 is the number of electrons in the half reactions, which is what you plug in for the n value.
by EmmaSaid3C
Wed Feb 01, 2017 10:22 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Internal Energy
Replies: 2
Views: 237

Re: Internal Energy

I believe it is because internal energy is a state function dependent on temperature, and since, by definition, an isothermal expansion is one in which temperature is constant, there is also no change in internal energy.
by EmmaSaid3C
Thu Jan 26, 2017 6:29 pm
Forum: Student Social/Study Group
Topic: Review?
Replies: 4
Views: 565

Re: Review?

There is preparation for quiz 1 in the back of the course reader, as well as textbooks problems listed for our current sections in the course reader that should be helpful in reviewing for the quiz.
by EmmaSaid3C
Tue Jan 17, 2017 10:25 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Born-Haber Cycle
Replies: 2
Views: 293

Re: Born-Haber Cycle

I don't think we need to know the Born-Haber Cycle because it is in section 8.18 in the textbook, and the course reader says to omit section 8.18.
by EmmaSaid3C
Thu Jan 12, 2017 1:49 pm
Forum: Phase Changes & Related Calculations
Topic: Most Helpful Resource
Replies: 14
Views: 1300

Re: Most Helpful Resource

Each resource has a different format, so it really depends on which setting you prefer. However, each resource offers the chance to ask questions, so they are all beneficial in that regard. UA office hours are more of a group work setting while TA office hours are more similar to discussion sections.
by EmmaSaid3C
Tue Nov 29, 2016 4:23 pm
Forum: *Titrations & Titration Calculations
Topic: ICE
Replies: 5
Views: 503

Re: ICE

You can generally take out the x when the k value is less than 10^-5.
by EmmaSaid3C
Sun Nov 27, 2016 10:51 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar/Nonpolar
Replies: 2
Views: 445

Re: Polar/Nonpolar

Also, looking at the symmetry of the molecule can help you decide if the molecule is polar or nonpolar. Symmetrical molecules tend to be nonpolar while non-symmetrical molecules tend to be polar.
by EmmaSaid3C
Sun Nov 27, 2016 10:47 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Sig figs in calculations for pH and pOH
Replies: 2
Views: 310

Re: Sig figs in calculations for pH and pOH

I believe that the sig fig rule for logs is the look at the number of sig figs for the number you are calculating, and then that becomes the number of numbers you have after the decimal point for your final answer. To verify, sig fig rules for logs are also listed toward the front of the course read...
by EmmaSaid3C
Wed Nov 16, 2016 10:12 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: How to determine which orbital has less energy when drawing an MO Energy Diagram
Replies: 2
Views: 268

Re: How to determine which orbital has less energy when drawing an MO Energy Diagram

I believe that the more electronegative atom has a lower energy level.
So in that case, oxygen would have a lower energy level than nitrogen because oxygen is more electronegative.
by EmmaSaid3C
Tue Nov 08, 2016 1:27 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Oxidation State
Replies: 3
Views: 259

Re: Oxidation State

To add to that, the oxidation state tells you how many electrons the atom has lost or gained.
by EmmaSaid3C
Thu Nov 03, 2016 3:18 pm
Forum: Sigma & Pi Bonds
Topic: Sigma and Pi Bonds
Replies: 3
Views: 509

Re: Sigma and Pi Bonds

Also, sigma bonds are stronger than pi bonds and only p orbitals can form pi bonds.
by EmmaSaid3C
Thu Oct 27, 2016 12:37 pm
Forum: Lewis Structures
Topic: Expanded Octet
Replies: 3
Views: 438

Re: Expanded Octet

You can have an expanded octet when the element is in the 3rd row and beyond on the periodic table.
by EmmaSaid3C
Thu Oct 20, 2016 8:55 pm
Forum: Trends in The Periodic Table
Topic: Electron affinity
Replies: 5
Views: 558

Re: Electron affinity

According to the Internet, "since the noble gases already have eight electrons in their outer shells, they don't want to attract any more. Since electronegativity measures the amount of attraction between an atom and an electron, noble gases do not have electronegativity." Therefore, Cl wo...
by EmmaSaid3C
Thu Oct 13, 2016 1:13 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Affinity
Replies: 6
Views: 613

Re: Electron Affinity

To add to that, electron affinity is the energy required/released to add one electron to an atom. "For example, when a neutral chlorine atom in the gaseous form picks up an electron to form a Cl- ion, it releases an energy of 349 kJ/mol. It is said to have an electron affinity of -349 kJ/mol an...
by EmmaSaid3C
Thu Oct 06, 2016 11:54 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Uncertainty Principle Equation
Replies: 1
Views: 365

Re: Heisenberg Uncertainty Principle Equation

According to Britannica, it has to do with the quantization of angular momentum.
by EmmaSaid3C
Wed Sep 28, 2016 11:26 pm
Forum: Einstein Equation
Topic: HW 1.9 - Sig Figs
Replies: 1
Views: 326

Re: HW 1.9 - Sig Figs

Hi,

According to the rules for rounding off in the course reader, it looks like 7.9512 should be rounded to 8.0 because when the last digit is 5 it says to round to the nearest number. Hope this helps.

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