Search found 28 matches

by 004594950
Wed Mar 09, 2016 4:06 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: drawing galvanic cells
Replies: 1
Views: 305

Re: drawing galvanic cells

You have to look at the reduction potential chart and see which value is the highest. The highest value between the two means that it's reduced, which belongs in the cathode. The lower value is oxidized, which occurs in the anode.
by 004594950
Tue Mar 01, 2016 2:39 pm
Forum: *Electrophilic Addition
Topic: Butene + Br2 Reaction (p. 85)
Replies: 2
Views: 872

Re: Butene + Br2 Reaction (p. 85)

Please refer to pg. 85 of the course reader. Is the reaction of butene with Br2 considered an electrophilic addition reaction, since the Br2 is polarized and one Br (partial positive) acts as an electrophile? Secondly, in the reaction of butene with Br2, the product we discussed in class is CH2BrC(...
by 004594950
Thu Feb 25, 2016 9:48 pm
Forum: *Alkanes
Topic: Double Headed Arrow
Replies: 4
Views: 661

Re: Double Headed Arrow

An arrow shows the transfer of electrons. A double headed arrow shows that two electron is transferred and a one headed arrow means that one electron is transferred.
by 004594950
Thu Feb 18, 2016 3:10 pm
Forum: *Nucleophiles
Topic: Attachment of a nucleophile
Replies: 2
Views: 342

Attachment of a nucleophile

So a nucleophile will attach/form a new bond to an element or compound that is partially positive, which is an electrophile?
by 004594950
Sat Feb 13, 2016 1:54 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Rate Order
Replies: 5
Views: 790

Re: Rate Order

Christian Hessenauer 2A wrote:They can be fractions, but can the rate order pretty much be anything between 0 and 3?

yes it can, but it is very rare for a rate law to be 3.
by 004594950
Tue Feb 02, 2016 2:38 pm
Forum: Balancing Redox Reactions
Topic: Helpful Tip
Replies: 2
Views: 321

Helpful Tip

To know what is happening in the anode and cathode, think of:

AN OX: Anode Oxidation and RED CAT: Reduction Cathode
by 004594950
Wed Jan 27, 2016 4:28 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: What is E?
Replies: 1
Views: 265

Re: What is E?

E is the cell potential or the voltage produced. It can be found by subtracting the E(Cathode)-E(Anode). The E values can be found in the textbook.
by 004594950
Wed Jan 20, 2016 6:44 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 3/2 and 5/2 R
Replies: 5
Views: 1740

Re: 3/2 and 5/2 R

Brooke VanSickle 1J wrote:Can someone please explain when to use 3/2R and 5/2R in calculations?
Thanks!


When the volume is constant, you use 3/2R.
When pressure is constant, you use 5/2R.
by 004594950
Wed Jan 13, 2016 3:11 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Internal Energy
Replies: 3
Views: 409

Internal Energy

Why is internal energy a state function?
by 004594950
Wed Jan 06, 2016 10:42 pm
Forum: Phase Changes & Related Calculations
Topic: Hess's Law
Replies: 8
Views: 917

Re: Hess's Law

It does't matter which method you use. As long as you get the correct answer. But Lavelle didn't go over the 3rd method today in lecture.
by 004594950
Tue Dec 01, 2015 11:34 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted vs Lewis acids and bases
Replies: 3
Views: 735

Re: Bronsted vs Lewis acids and bases

Bronsted Acid is a proton donor and a Bronsted Base is a proton acceptor.
by 004594950
Sun Nov 29, 2015 11:57 pm
Forum: Lewis Acids & Bases
Topic: determining lewis acids and bases
Replies: 2
Views: 393

Re: determining lewis acids and bases

You don't have to draw it out. Just need to know that a lewis acid is an electron acceptor and a lewis base is an electron donor.
by 004594950
Sun Nov 15, 2015 9:53 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Workbook Quiz #6
Replies: 1
Views: 306

Workbook Quiz #6

In the information that is given in #6, is the 3.18x10^-4 molar concentration of I2 in equilibrium concentration or the initial concentration?
by 004594950
Fri Nov 13, 2015 9:13 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Naming Coordinate Covalent Compounds
Replies: 1
Views: 432

Naming Coordinate Covalent Compounds

When naming coordinate covalent compounds, when do you use -ate at the end of an element compared to using just the element name.
by 004594950
Wed Nov 04, 2015 10:24 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: MO Diagrams
Replies: 1
Views: 303

MO Diagrams

what is Z? and why is the diagram symmetrical when Z > 8 and asymmetrical when Z<8?
by 004594950
Sun Oct 25, 2015 3:34 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Quiz 2
Replies: 2
Views: 343

Quiz 2

Do we need to know Bond Order for the upcoming quiz on week 5?
by 004594950
Thu Oct 15, 2015 4:36 pm
Forum: Octet Exceptions
Topic: Radical Octets
Replies: 1
Views: 457

Radical Octets

What are radical octets? How do we know if an element/compound is an exception to the octet rule?
by 004594950
Thu Oct 08, 2015 12:43 pm
Forum: Photoelectric Effect
Topic: Problem 1.25 (b) 5.00 mg of Na atoms
Replies: 2
Views: 473

Re: Problem 1.25 (b) 5.00 mg of Na atoms

From the Chapter 1 Exercises, I'm having difficulty in finding how much energy is emitted by (b) 5.00 mg of Na atoms at a wavelength of 589 nm. I had no issue with (a) and (c), but I don't know how to go about with part (b), as we are given the mass of Na atoms. Please help, thank you! the first th...
by 004594950
Thu Oct 08, 2015 12:38 pm
Forum: *Shrodinger Equation
Topic: Magnetic Spin
Replies: 2
Views: 474

Magnetic Spin

When drawing out the electron configuration, can we make the spin downwards first or is it always spinning up first?
by 004594950
Thu Oct 08, 2015 12:31 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Electron Spins
Replies: 5
Views: 811

Re: Electron Spins

Mostly out of curiosity, why can't electrons spin the same way in the same orbital, as the Pauli Exclusion Principle says? How do they affect each other in this way? electrons can't spin in the same way in the same orbital because the two electrons repulse one another, making on spin up and the oth...
by 004594950
Thu Oct 08, 2015 12:29 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 1.15 How do you go from 102.6 nm to 102.6 x 10^-9m?
Replies: 2
Views: 369

Re: 1.15 How do you go from 102.6 nm to 102.6 x 10^-9m?

How do we know the exponent of the given information? If we are given 102.6 nm how do we get 102.6 x 10^-9 m? Does it have to do with the hydrogen or where does it come from? Other questions also went from 10^-7m to nm. What is the relation? nm is nanometer and you want to use meters. nanometers is...
by 004594950
Thu Oct 08, 2015 12:21 pm
Forum: SI Units, Unit Conversions
Topic: What prefixes do I need to know? [ENDORSED]
Replies: 6
Views: 987

Re: What prefixes do I need to know? [ENDORSED]

paullim49 wrote:There are prefixes in the textbook that are not in the course reader. Should we still know the ones in the textbook?


you should know kilo, milli, pico, nano, centi, etc.
by 004594950
Thu Oct 08, 2015 12:07 pm
Forum: SI Units, Unit Conversions
Topic: Grams to Mol
Replies: 3
Views: 900

Re: Grams to Mol

I have trouble understanding where do I get the grams when I am converting grams to mol. the grams is the molar mass of a compound. to find it, you use the periodic table and look at the mass of each element and add it together. if a compound has a subscript or a coefficient, you need to multiply t...
by 004594950
Thu Oct 08, 2015 11:56 am
Forum: Empirical & Molecular Formulas
Topic: Empirical to Molecular
Replies: 3
Views: 582

Re: Empirical to Molecular

Egbert Lin 3B wrote:What data do you need to find the molecular formula from an empirical formula?


you need the mass of the molecular formula then divide that by the molar mass of the empirical formula.
by 004594950
Thu Oct 08, 2015 10:27 am
Forum: Properties of Light
Topic: Wavelength
Replies: 3
Views: 416

Re: Wavelength

kemekacorry wrote:How do you convert a wavelength such as 2.5nm (problem 1.9) into scientific notation in order to probably do the equation?


1 nm = 10^-9 m.
by 004594950
Thu Oct 08, 2015 10:23 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Chapter 1 HW #57
Replies: 3
Views: 513

Chapter 1 HW #57

On number 57, how do we know the energy levels (n), are 2 and 7?
by 004594950
Fri Oct 02, 2015 4:18 pm
Forum: Balancing Chemical Reactions
Topic: the number of moles
Replies: 2
Views: 574

Re: the number of moles

warugurundirangu4e wrote:is the number of moles in a chemical equation just the number in the front for example: 2NaOH(aq)+H2(g)=2 moles +1 mole


Yes, the coefficients in front of the chemical formula is the number of moles.
by 004594950
Fri Oct 02, 2015 4:15 pm
Forum: Einstein Equation
Topic: E=hv constant
Replies: 2
Views: 654

Re: E=hv constant

"h"stands for Planck's constant. It is a proportionality constant between energy and frequency.

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