Search found 31 matches

by Erica Li 1C
Sat Dec 08, 2018 10:53 pm
Forum: Ionic & Covalent Bonds
Topic: ionic and covalent bonds
Replies: 5
Views: 74

Re: ionic and covalent bonds

Yup! Both highest at fluorine
by Erica Li 1C
Sat Dec 08, 2018 12:38 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Shape
Replies: 5
Views: 68

Re: Shape

Yeah I'm pretty sure Lavelle said that he would always be asking for molecular geometry
by Erica Li 1C
Sat Dec 08, 2018 12:36 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR
Replies: 4
Views: 61

Re: VSEPR

Yeah! The shape is linear with bond angles 180 degrees
by Erica Li 1C
Sat Dec 08, 2018 12:33 pm
Forum: Quantum Numbers and The H-Atom
Topic: Determining electrons
Replies: 3
Views: 58

Re: Determining electrons

You look at the number of orbitals in a given subshell and then multiply it by 2 since there are 2 electrons in each orbital
(so if l=2, there are 5 orbitals, meaning 10 electrons)
by Erica Li 1C
Sat Dec 08, 2018 12:26 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Help with problem
Replies: 1
Views: 40

Re: Help with problem

Since you are given diameter (2x10^-4 m) and you are trying to find velocity, you just have to figure out what the mass of oxygen is since it's asking for uncertainty of velocity of the oxygen molecule. Since oxygen is diatomic, it's O2, so when you find the mass it would be 32 g/mol x 1/6.022x10^23...
by Erica Li 1C
Sat Dec 08, 2018 12:18 pm
Forum: Octet Exceptions
Topic: expanded octet bonding
Replies: 1
Views: 30

expanded octet bonding

For expanded octets, how do you know the maximum number of bonds they can form?
by Erica Li 1C
Sat Dec 08, 2018 12:06 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH vs. pOH
Replies: 2
Views: 34

pH vs. pOH

If you're given the value for pH, to find pOH is it literally just 14 minus the pH?
by Erica Li 1C
Sat Dec 08, 2018 12:04 pm
Forum: Trends in The Periodic Table
Topic: effective nuclear charge
Replies: 2
Views: 38

effective nuclear charge

I'm still kind of confused on what exactly effective nuclear charge is as well as what its trend is in the periodic table?
by Erica Li 1C
Sat Dec 08, 2018 12:02 pm
Forum: Empirical & Molecular Formulas
Topic: combustion analysis?
Replies: 2
Views: 45

combustion analysis?

What exactly are the "general" steps that you would take if you were calculating a combustion analysis problem?
by Erica Li 1C
Sat Dec 08, 2018 12:00 pm
Forum: Lewis Acids & Bases
Topic: Lewis acids and bases vs. Bronsten
Replies: 2
Views: 29

Lewis acids and bases vs. Bronsten

I was wondering what exactly the differences/similarities are between Lewis acids and bases and Bronsten acids and bases?
by Erica Li 1C
Sat Dec 08, 2018 11:56 am
Forum: Naming
Topic: memorizing complexes?
Replies: 2
Views: 36

memorizing complexes?

Are we supposed to know off the top of our heads what complexes like (en) and (ox) are?
by Erica Li 1C
Sat Dec 08, 2018 11:54 am
Forum: Sigma & Pi Bonds
Topic: Test 3 Q3D
Replies: 4
Views: 70

Test 3 Q3D

In 3d it asked you to draw a picture showing how a pi bond would be formed from two p orbitals but I had no idea how you're supposed to draw that??
by Erica Li 1C
Sat Dec 08, 2018 11:52 am
Forum: Photoelectric Effect
Topic: Test 2 Q2c
Replies: 2
Views: 54

Test 2 Q2c

How do you calculate the wavelength of the ejected electron? It's given that the chromium metal is irradiated with light (wavelength 3.45x10^-11 m) and the kinetic energy is 2x10^-19 J and in part a it was found that the work function is 5.76 x 10^-15 J, but how do you find the wavelength of the eje...
by Erica Li 1C
Sat Dec 08, 2018 11:49 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Test 3
Replies: 1
Views: 38

Test 3

On my third test in this class one of the questions was to order the anions I-, Cl-, S2-, and P3- from least to most polarizable. I was wondering why Cl- is the least polarizable even though it has a -1 charge?
by Erica Li 1C
Sat Dec 08, 2018 11:48 am
Forum: Significant Figures
Topic: when to round?
Replies: 2
Views: 40

when to round?

Are we only supposed to look at the sigfigs given for values in the question? Do we have to account for sigfigs in the constants that are given?
by Erica Li 1C
Sat Dec 08, 2018 11:46 am
Forum: Properties of Light
Topic: HW 1.55A
Replies: 1
Views: 32

HW 1.55A

I'm confused as to where to start with this question because the units are given as 1/cm? Would I just do unit conversions to convert it to m and then solve it as usual?
by Erica Li 1C
Sat Dec 08, 2018 11:36 am
Forum: Naming
Topic: polydentate complexes?
Replies: 2
Views: 46

polydentate complexes?

I'm super confused on how to figure out if a polydentate is monodentate, bidentate, etc. based on Lewis structure?
by Erica Li 1C
Fri Nov 09, 2018 10:21 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: ionic vs. covalent character
Replies: 3
Views: 56

ionic vs. covalent character

I was wondering what the difference between a molecule with high ionic character vs. high covalent character was?
by Erica Li 1C
Tue Oct 30, 2018 3:31 pm
Forum: Lewis Structures
Topic: kekule structure?
Replies: 3
Views: 58

kekule structure?

The book mentioned something about a Kekule structure but I didn't really understand what that was/the significance of it. Could someone explain it to me?
by Erica Li 1C
Tue Oct 30, 2018 3:24 pm
Forum: Octet Exceptions
Topic: octet rule exceptions?
Replies: 5
Views: 75

octet rule exceptions?

I'm confused, are all the atoms outside of the period 2 ones able to have an expanded octet?
by Erica Li 1C
Sun Oct 28, 2018 1:30 pm
Forum: Lewis Structures
Topic: Lewis Dot Order
Replies: 10
Views: 63

Re: Lewis Dot Order

Nope! just make sure that there's one dot on all 4 sides before you can start pairing them together
by Erica Li 1C
Sun Oct 28, 2018 1:27 pm
Forum: Lewis Structures
Topic: Polyatomic Ions
Replies: 3
Views: 26

Re: Polyatomic Ions

I think you don't have to, but I also think that as we go along and do more problems that use common elements like that you'll start to memorize their charges anyways
by Erica Li 1C
Sun Oct 28, 2018 1:23 pm
Forum: Octet Exceptions
Topic: Octet Exceptions
Replies: 3
Views: 63

Re: Octet Exceptions

Just to add on to that, they follow the duplet rule as opposed to the octet rule!
by Erica Li 1C
Sun Oct 28, 2018 1:20 pm
Forum: Ionic & Covalent Bonds
Topic: ionic vs. covalent bonds
Replies: 3
Views: 59

ionic vs. covalent bonds

In general are ionic bonds much stronger than covalent bonds?
by Erica Li 1C
Sun Oct 28, 2018 1:19 pm
Forum: Ionic & Covalent Bonds
Topic: ionization energy
Replies: 7
Views: 95

Re: ionization energy

Removing the first electron is easier since the pull isn't as strong but the second one is always harder since there is a pull on the electrons that are left so it's harder for them to be removed
by Erica Li 1C
Fri Oct 12, 2018 11:01 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: spherical polar coordinates
Replies: 1
Views: 13

Re: spherical polar coordinates

r is the distance from nucleus, theta is the angle from the positive z-axis (the "north pole", kind of like latitude), and phi is the angle about the z-axis (like longitude)
by Erica Li 1C
Fri Oct 12, 2018 10:59 pm
Forum: DeBroglie Equation
Topic: explain debroglie equation?
Replies: 3
Views: 52

explain debroglie equation?

I don't think I really understand the de Broglie equation at all and how it relates to what exactly we're learning, could someone explain it to me?
by Erica Li 1C
Fri Oct 12, 2018 10:54 pm
Forum: *Black Body Radiation
Topic: What is a black body? [ENDORSED]
Replies: 7
Views: 477

Re: What is a black body? [ENDORSED]

For a black body, as the temperature increases the max intensity of radiation produces shorter wavelengths as well
by Erica Li 1C
Thu Oct 04, 2018 4:40 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: diatomic molecules
Replies: 5
Views: 50

diatomic molecules

Is there any helpful way to memorize the diatomic molecules?
by Erica Li 1C
Thu Oct 04, 2018 4:36 pm
Forum: Molarity, Solutions, Dilutions
Topic: V=n/c
Replies: 7
Views: 68

Re: V=n/c

I'm not sure if "m" is used for molarity, but I think M refers to molarity (molar concentration), and "m" is used to denote the units for meters and I guess "m" can also be used to symbolize mass??
by Erica Li 1C
Thu Oct 04, 2018 4:12 pm
Forum: SI Units, Unit Conversions
Topic: Homework Questions [ENDORSED]
Replies: 14
Views: 194

Re: Homework Questions [ENDORSED]

I think you can do any 7 you want but it's probably better to do most of the ones he lists for practice for the test

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