Search found 31 matches

by 305008749
Tue Dec 04, 2018 11:10 pm
Forum: General Science Questions
Topic: Can We Take The Final In Pencil?
Replies: 14
Views: 442

Re: Can We Take The Final In Pencil?

The final has to be in pen, at least that is what will be graded. I'm pretty sure you can use pencil to work out some problems though but you have to remember to trace it in pen in order to get credit.
by 305008749
Tue Dec 04, 2018 11:07 pm
Forum: Naming
Topic: Difference between cis and trans
Replies: 4
Views: 83

Re: Difference between cis and trans

if the ligands are on opposite sides, then it is considered trans. if the ligands are on the same side, then it is considered cis.
by 305008749
Tue Dec 04, 2018 11:02 pm
Forum: Naming
Topic: 9C.1 7th edition
Replies: 1
Views: 74

Re: 9C.1 7th edition

The solutions manual says that the general equation for determining the oxidation number of metal in a complex ion is:
(the # metal atoms)(oxidation number of the metal)+(# each ligand)(charge of each ligand)=charge of the ion
by 305008749
Sat Dec 01, 2018 9:27 pm
Forum: Lewis Acids & Bases
Topic: Lewis vs Bronsted
Replies: 2
Views: 59

Re: Lewis vs Bronsted

I'm not sure about bases but I think B-L acids mean a substance must contain/donate H+ to be an acid while Lewis acids mean all the substances that can accept an electron pair form a lewis base are known as acids.
by 305008749
Sat Dec 01, 2018 9:17 pm
Forum: Student Social/Study Group
Topic: Final
Replies: 12
Views: 583

Re: Final

He mentioned in lecture that the topics would be covered equally.
by 305008749
Sat Dec 01, 2018 9:16 pm
Forum: Electronegativity
Topic: Trend of Electronegativity
Replies: 18
Views: 605

Re: Trend of Electronegativity

Yes. The electronegativity trend is that it increases as it goes up and to the right on a periodic table.
by 305008749
Sun Nov 18, 2018 10:44 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles in 7E 2E.13.b
Replies: 4
Views: 79

Re: Bond Angles in 7E 2E.13.b

The solutions manual says 109.5 so I'm assuming the double bond doesn't affect it?
by 305008749
Sun Nov 18, 2018 10:41 pm
Forum: Properties of Light
Topic: Test 3
Replies: 24
Views: 548

Re: Test 3

It should cover everything from after the midterm until now, so from Lewis Structures to Hybridization.
by 305008749
Sun Nov 18, 2018 10:39 pm
Forum: Electronegativity
Topic: Question about what makes something ionic
Replies: 5
Views: 118

Re: Question about what makes something ionic

The electronegativity difference between H and Br atoms is not that large and the atoms in the molecules are not dependent on associated charges to stabilize one another.
by 305008749
Sun Nov 18, 2018 8:07 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Drawing structures
Replies: 8
Views: 183

Re: Drawing structures

We don't have to worry about that for 14A I believe.
by 305008749
Sun Nov 18, 2018 8:06 pm
Forum: Administrative Questions and Class Announcements
Topic: Thanksgiving Wednesday Class
Replies: 19
Views: 435

Re: Thanksgiving Wednesday Class

No lecture on Wednesday! He confirmed it on Friday.
by 305008749
Sun Nov 18, 2018 8:02 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 7th edition 2E.13
Replies: 3
Views: 71

Re: 7th edition 2E.13

As long as it shows the 180 degree bond then it should not matter whether it is horizontal or vertical.
by 305008749
Sun Nov 18, 2018 8:00 pm
Forum: Dipole Moments
Topic: Test
Replies: 15
Views: 260

Re: Test

It is week 9 in section, right after Thanksgiving break.
by 305008749
Sun Nov 18, 2018 7:57 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 8
Views: 154

Re: Lone Pairs

This may be the wrong wording but I think because the lone pairs are more.. free? That's what makes them more negative, therefore having a strong repulsion which is why they have to be separated as far away from each other. Where they are then placed will affect the bonds near them which will cause ...
by 305008749
Sun Nov 18, 2018 7:49 pm
Forum: Resonance Structures
Topic: Bond Length
Replies: 4
Views: 337

Re: Bond Length

Since resonance structures show a molecule's overall stability, I think it is most relevant when determining where the molecule might be more electron rich or poor, eventually leading into figuring out its molecular shape.
by 305008749
Sun Nov 18, 2018 7:39 pm
Forum: Ionic & Covalent Bonds
Topic: Salts and Molecules
Replies: 2
Views: 97

Re: Salts and Molecules

Salts are able to dissolve in water so you know it has ionic bonds. I'm not necessarily sure about molecules alone, but I think it may safe to assume that it is a molecule if it does NOT dissolve in water, and of course has covalent bonds.
by 305008749
Sun Nov 18, 2018 7:33 pm
Forum: Student Social/Study Group
Topic: Turning in Homework (Thanksgiving Break)
Replies: 8
Views: 233

Re: Turning in Homework (Thanksgiving Break)

From what I've heard you're supposed to turn it in week 9. So you turn in 14 problems total, 7 from week 8 and 7 from week 9.
by 305008749
Sun Oct 28, 2018 10:51 pm
Forum: Trends in The Periodic Table
Topic: Trends in the periodic table
Replies: 2
Views: 93

Re: Trends in the periodic table

The trends of electron affinity in the periodic table are that electron affinity increases as it goes up the groups and across the periods from left to right. This happens because electrons added to energy levels get closer to the nucleus so there is a stronger attraction between the nucleus and its...
by 305008749
Sun Oct 28, 2018 10:39 pm
Forum: Quantum Numbers and The H-Atom
Topic: Degeneracy
Replies: 3
Views: 136

Re: Degeneracy

From my understanding, "degenerate" refers to "same energy" or "of equal energy" so if it is talking about degenerate orbitals, it means that they have the same energy.
by 305008749
Sun Oct 28, 2018 10:35 pm
Forum: Ionic & Covalent Bonds
Topic: Good practice options for lewis structures?
Replies: 3
Views: 78

Re: Good practice options for lewis structures?

this link has about 27 practice problems along with the answers in the bottom of the page! http://myweb.astate.edu/mdraganj/LewisDot.html
by 305008749
Sun Oct 21, 2018 9:03 pm
Forum: SI Units, Unit Conversions
Topic: How does grading for discussion posts work?
Replies: 80
Views: 2572

Re: How does grading for discussion posts work?

My TA said that the cut off is Sunday night, 3 points each week, but the professor will not count and give you the points until the end of the quarter.
by 305008749
Sun Oct 21, 2018 8:52 pm
Forum: Properties of Light
Topic: Problem 1A.3
Replies: 3
Views: 106

Re: Problem 1A.3

According to the solutions manual, "the electrical field corresponds to the amplitude; as the frequency decreases, the waves broaden and the extent of the change (the slope of the wave) decreases." I hope this helps!
by 305008749
Sun Oct 21, 2018 8:40 pm
Forum: Properties of Electrons
Topic: ml
Replies: 5
Views: 163

Re: ml

I am pretty sure you can use a lowercase l. I do that as well because it can be quite confusing. I'm not exactly sure how to explain what ml is but from what I understand, it just tells you the subshell's (which is determined by l) orbitals orientation. So in the example he gave us, if the subshell ...
by 305008749
Sun Oct 21, 2018 8:28 pm
Forum: Photoelectric Effect
Topic: Test #2
Replies: 9
Views: 251

Re: Test #2

That's true. On Friday he mentioned that all the material from after the last test up until Friday's lecture will be on Test 2.
by 305008749
Fri Oct 12, 2018 10:40 pm
Forum: DeBroglie Equation
Topic: Equations
Replies: 9
Views: 153

Re: Equations

Yes, we should be receiving the same paper for midterms and finals. The only thing that's a bit confusing is whether to use the molar mass from the paper or the textbook because as I'm doing homework, I'm starting to memorize the ones from the textbook instead. I don't know if that will mess up my a...
by 305008749
Fri Oct 12, 2018 10:36 pm
Forum: SI Units, Unit Conversions
Topic: Should Significant Figures be affected by constants?
Replies: 10
Views: 263

Re: Should Significant Figures be affected by constants?

when you guys say sig figs aren't affected by constants, does that mean we will still get the right answer if we use them or to not use it? In other words we should just ignore the constants and go based off the variables given to us?
by 305008749
Fri Oct 12, 2018 10:30 pm
Forum: Photoelectric Effect
Topic: Threshold energy [ENDORSED]
Replies: 17
Views: 442

Re: Threshold energy [ENDORSED]

From my understanding, threshold energy is the minimum amount of energy that is needed for a reaction to take place, so in this case the "reaction" is removing electrons.
by 305008749
Thu Oct 04, 2018 8:41 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Molecular weight vs molar mass
Replies: 3
Views: 87

Re: Molecular weight vs molar mass

That makes sense, thanks!
by 305008749
Thu Oct 04, 2018 8:39 pm
Forum: SI Units, Unit Conversions
Topic: formula units [ENDORSED]
Replies: 69
Views: 22561

Re: formula units [ENDORSED]

My TA said to not round the atomic masses given on the periodic table, just use them as is. One of the few times that it's safe to round, is when you are trying to find the empirical formula for a compound because that's when you really want the whole numbers.
by 305008749
Thu Oct 04, 2018 8:31 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Molecular weight vs molar mass
Replies: 3
Views: 87

Molecular weight vs molar mass

I'm having trouble understanding what is the difference between molecular weight and molar mass. Aren't they basically the same thing?
by 305008749
Thu Oct 04, 2018 8:29 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Molar Masses
Replies: 9
Views: 188

Re: Molar Masses

yes, I believe that is correct.

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