Search found 36 matches

by Amy Xiao 1H
Mon Nov 18, 2019 10:57 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: AXE formula
Replies: 9
Views: 26

Re: AXE formula

If there is no central atom, there would simply be no A in the formula. For example, in I3-, the formula is X2E3 because there is no central atom. (This is problem 2E13A)
by Amy Xiao 1H
Mon Nov 18, 2019 10:54 pm
Forum: Lewis Structures
Topic: Bent or Angular?
Replies: 1
Views: 4

Bent or Angular?

Is bent or angular the best term to use to describe a trigonal planar/tetrahedral with one lone pair? VSEPR charts online use the term "bent," but the textbook calls them "angular".
by Amy Xiao 1H
Mon Nov 18, 2019 10:51 pm
Forum: Lewis Structures
Topic: Organic Compounds
Replies: 2
Views: 8

Re: Organic Compounds

I can see where you would be confused, because I am as well. All I know is that on the tests, when there are complex compounds, the test question seems to indicate where the central atoms are and what they are bonded to, and then you could probably go from there.
by Amy Xiao 1H
Mon Nov 18, 2019 10:48 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: ion dipole interactions
Replies: 3
Views: 20

Re: ion dipole interactions

I think so, because mixing ions into water (which is polar) would cause the more positive dipole on the H of water to attract/be attracted to the chlorine ion. I think the term polar would apply to ions in this case; polar seems to just be if there is a net charge that is not zero.
by Amy Xiao 1H
Mon Nov 18, 2019 10:43 pm
Forum: Lewis Structures
Topic: Octet Rule
Replies: 3
Views: 20

Octet Rule

Can elements that break the octet rule only do so until their formal charge becomes zero, or is the formal charge not a major factor for the octet rule?
by Amy Xiao 1H
Mon Nov 18, 2019 10:39 pm
Forum: Sigma & Pi Bonds
Topic: Sigma Bonds
Replies: 2
Views: 11

Sigma Bonds

Is it possible for a central atom to have multiple sigma bonds, each connected to a different atom? Or does the one sigma bond rule hold true for the entire atom?
by Amy Xiao 1H
Sat Nov 09, 2019 6:15 pm
Forum: Dipole Moments
Topic: 3F.19
Replies: 1
Views: 9

3F.19

Can someone explain parts B and C? For B, I am confused about why the hydrogen bonding in water is stronger than the attractive forces in diethyl ether. I thought diethyl ether would also have hydrogen bonding. For C, why does a lower surface area due to the compactness of dimethylpropane cause it t...
by Amy Xiao 1H
Sat Nov 09, 2019 5:59 pm
Forum: Dipole Moments
Topic: 3F.5
Replies: 2
Views: 9

3F.5

Can someone explain why CHI3 has a higher melting point that CHF3? If fluorine is more electronegative than chlorine, wouldn't it have a stronger hold on the electrons and cause there to be a higher melting point instead?
by Amy Xiao 1H
Sat Nov 09, 2019 5:44 pm
Forum: Dipole Moments
Topic: Summary of all the Different Possible Forces?
Replies: 1
Views: 10

Summary of all the Different Possible Forces?

Can someone give a quick and easy-to-remember summary for all the forces? (Ion-Dipole, Dipole-Dipole, London, and Hydrogen Bonding) Can you also provide examples where multiple can exist in the same molecule?
by Amy Xiao 1H
Sat Nov 09, 2019 5:39 pm
Forum: Dipole Moments
Topic: How do i know if a molecule has a dipole moment?
Replies: 7
Views: 47

Re: How do i know if a molecule has a dipole moment?

To summarize, all molecules have dipole moments unless they are between the same element and/or symmetrical?
by Amy Xiao 1H
Wed Nov 06, 2019 12:31 pm
Forum: Empirical & Molecular Formulas
Topic: Number 1 in Dino Nuggets
Replies: 3
Views: 47

Re: Number 1 in Dino Nuggets

Your explanation was super helpful, but can you explain why you don't know where the O is coming from? Why can't you just add the mol of Oxygen from CO2 and H2O?
by Amy Xiao 1H
Tue Oct 29, 2019 9:09 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm
Replies: 10
Views: 75

Re: Midterm

I think that we need a blue book, since it is an official midterm, as well as a scientific calculator for basic calculations. Other than that, some extra pens would be good to have on hand too. And I haven't heard anything about the midterm locations yet, so he will probably be sending out an email...
by Amy Xiao 1H
Tue Oct 29, 2019 9:03 pm
Forum: Ionic & Covalent Bonds
Topic: HW 2A19
Replies: 1
Views: 27

HW 2A19

For part e, why are there two unpaired electrons for Ni2+?
by Amy Xiao 1H
Tue Oct 29, 2019 8:10 pm
Forum: Ionic & Covalent Bonds
Topic: Homework 2A15
Replies: 3
Views: 32

Re: Homework 2A15

For Gallium to give away 3 electrons requires lower energy compared to accepting 5 electrons.
by Amy Xiao 1H
Tue Oct 29, 2019 8:00 pm
Forum: Ionic & Covalent Bonds
Topic: Textbook question 2A.1
Replies: 2
Views: 19

Re: Textbook question 2A.1

Going off of what Connie said, the 3d block is already filled so you don't have to include those electrons in when you count; a good rule of thumb for me is to see what column (group) the element is in and use that number. Sb is in the 5th group from the left if you disregard the d block of metals.
by Amy Xiao 1H
Tue Oct 29, 2019 7:55 pm
Forum: Ionic & Covalent Bonds
Topic: How to count valence electrons with the d block
Replies: 4
Views: 22

Re: How to count valence electrons with the d block

The textbook problem 2A.1c states that Mn has 7 valence electrons, but it is very clear about "including d electrons."
by Amy Xiao 1H
Sun Oct 27, 2019 1:44 pm
Forum: Lewis Structures
Topic: Expanded Octet
Replies: 6
Views: 18

Re: Expanded Octet

If that is the case, why even have the Octet rule? I understand that it is an easy rule of thumb for many elements, but if it does not really apply after the d-orbital comes into play, is it really helpful?
by Amy Xiao 1H
Sun Oct 27, 2019 1:43 pm
Forum: Ionic & Covalent Bonds
Topic: "Delocalized" Electrons
Replies: 5
Views: 42

Re: "Delocalized" Electrons

I am also confused. I thought covalent bonds were ones in which the electron was already free to move around, so I am not understanding how an electron can be free to move around the entire molecule instead. What allows it to do so?
by Amy Xiao 1H
Sun Oct 27, 2019 1:39 pm
Forum: Ionic & Covalent Bonds
Topic: Writing Electron Configurations for an Ion
Replies: 6
Views: 23

Re: Writing Electron Configurations for an Ion

I'm not too confident on this topic either, but I'm pretty sure you remove or add an electron to the highest energy level depending on whether you want a cation or anion. For example, to change Zinc from its ground-state to Zn+, you take the ground state configuration [Ar]3d^104s^2 and remove an el...
by Amy Xiao 1H
Sun Oct 27, 2019 1:37 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1019067

Re: Post All Chemistry Jokes Here

Do you know any good jokes about Sodium Hypobromite?

NaBrO
by Amy Xiao 1H
Sun Oct 27, 2019 1:34 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1019067

Re: Post All Chemistry Jokes Here

Why are noble gases good at singing?

Because their resonance is the most stable!
by Amy Xiao 1H
Sun Oct 20, 2019 11:12 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1019067

Re: Post All Chemistry Jokes Here

Have you seen the new James Bond movie?

The name's Bond. Covalent Bond.
by Amy Xiao 1H
Sun Oct 20, 2019 11:11 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1019067

Re: Post All Chemistry Jokes Here

Why is Helium the best audience for a comedy show?

Because it always says He He He.
by Amy Xiao 1H
Sun Oct 20, 2019 11:08 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Purpose of the Equation
Replies: 9
Views: 41

Re: Purpose of the Equation

The more you know about the velocity, the less you know about the speed, and vice versa. The reason for this according to Dr. Lavelle is that the process of observing either one of those influences the other. If you set up more sensors to get accurate velocities, you will move the electron off cours...
by Amy Xiao 1H
Sun Oct 20, 2019 12:58 pm
Forum: Photoelectric Effect
Topic: Work Function
Replies: 9
Views: 56

Re: Work Function

Dr. Lavelle uses those terms practically interchangeably when discussing the photoelectric effect.
by Amy Xiao 1H
Thu Oct 17, 2019 10:31 pm
Forum: Properties of Electrons
Topic: 1B.3
Replies: 3
Views: 43

Re: 1B.3

I think Dr. Lavelle went over this in class while explaining the photoelectric effect. He did not go over black body radiation much, and atomic spectra relates to electrons, not electromagnetic radiation, so that narrows it down to either electron diffraction or the photoelectric effect. I chose to ...
by Amy Xiao 1H
Sat Oct 12, 2019 10:29 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1019067

Re: Post All Chemistry Jokes Here

My Chem teacher argued that Iron Man was a woman.

Fe-male
by Amy Xiao 1H
Sat Oct 12, 2019 10:28 pm
Forum: Administrative Questions and Class Announcements
Topic: Tutoring? [ENDORSED]
Replies: 61
Views: 53670

Re: Tutoring? [ENDORSED]

I reached out to Alpha Chi Sigma and was told that tutoring would start Week 3, so make sure to contact them once Monday starts!
by Amy Xiao 1H
Sat Oct 12, 2019 10:24 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1019067

Re: Post All Chemistry Jokes Here

What element best describes me?

The element of indecision: Imnotsurium
by Amy Xiao 1H
Sat Oct 12, 2019 10:22 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 63
Views: 18515

Re: Final Jitters

I took Quiz 1 after running into the room 3 minutes late and I was panicking, but I calmed down and thought out my answers. I would say that the best thing to do is review everything that you need on the syllabus: pen, non-graphing calculator, etc. If something will be given, don't try to remember e...
by Amy Xiao 1H
Sat Oct 12, 2019 10:16 pm
Forum: Properties of Light
Topic: Light intensity and Kinetic Energy
Replies: 7
Views: 48

Re: Light intensity and Kinetic Energy

I think that Lily is right in saying that there is no correlation between light intensity and the kinetic energy in the equation E=hv.
by Amy Xiao 1H
Sat Oct 12, 2019 9:56 pm
Forum: Properties of Light
Topic: 1A.3
Replies: 4
Views: 21

Re: 1A.3

C would be the correct answer. Think of the "change in the electrical field" as slope-- how steep a wave goes. As frequency decreases, the waves stretch out farther and the slope would be less steep because they are now farther apart.
by Amy Xiao 1H
Wed Oct 02, 2019 10:11 pm
Forum: Properties of Light
Topic: Electric Field and Magnetic Field
Replies: 3
Views: 43

Re: Electric Field and Magnetic Field

What effect does the magnetic field have on the electrons, then?
by Amy Xiao 1H
Sun Sep 29, 2019 10:15 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical Formulas Rounding and Multiplying
Replies: 11
Views: 122

Re: Empirical Formulas Rounding and Multiplying

I personally feel like the general rule of thumb for round should include only integers ending in 0.5 or 0.33. Anything else, can either be rounded up or down. For example: If your result is a number that is 2.55, obviously round that to just 2.5. I understand that you would round 2.55 to 2.5, but ...
by Amy Xiao 1H
Sat Sep 28, 2019 5:23 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical Formulas Rounding and Multiplying
Replies: 11
Views: 122

Re: Empirical Formulas Rounding and Multiplying

What should the threshold be for decimals when solving for empirical formulas? I think that if the results are 0.1 away from the nearest whole number, then you round to that whole number. Otherwise, I think you multiply to the nearest whole number. However, I see in some example problems, like one ...
by Amy Xiao 1H
Sat Sep 28, 2019 2:26 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical Formulas Rounding and Multiplying
Replies: 11
Views: 122

Empirical Formulas Rounding and Multiplying

What should the threshold be for decimals when solving for empirical formulas? I think that if the results are 0.1 away from the nearest whole number, then you round to that whole number. Otherwise, I think you multiply to the nearest whole number. However, I see in some example problems, like one w...

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