Search found 30 matches

by Sunjum Singh 1I
Thu Jun 07, 2018 3:31 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Hw 17.37
Replies: 3
Views: 86

Hw 17.37

I'm totally lost on how to find the coordination numbers on these problems. Does anyone have a method or a way they can help me to solve these?
a) [NiCl4]^2-
b) [Ag(NH3)2]
c) [PtCl2(en)2]^2+
by Sunjum Singh 1I
Thu Jun 07, 2018 3:19 pm
Forum: Hybridization
Topic: 4.43
Replies: 1
Views: 104

Re: 4.43

They way I thought through this question was that sp3 has bond angles of 109.5, sp2 has 120. Between those two, the p decreased, and the bond angle increased. If we look at sp, its 180. The S character is the s orbital level, so as it increases, the bond angle also increases.
by Sunjum Singh 1I
Wed Jun 06, 2018 3:32 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: H+ and H3O+
Replies: 1
Views: 137

H+ and H3O+

Just for clarification, H+ and H3O+ are interchangeable when talking about hydronium concentrations right?
by Sunjum Singh 1I
Sun Jun 03, 2018 6:18 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: How To Know When A Molecule Will Be Bent?
Replies: 4
Views: 180

Re: How To Know When A Molecule Will Be Bent?

If it didn't have the lone pair it would be linear but since the lone pair is there it pushes the other bonds down and it becomes bent
by Sunjum Singh 1I
Sat Jun 02, 2018 3:20 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 2
Views: 66

Lone Pairs

So when determining the molecular shape, lone pairs are considered a region of electron density but they don't make it the shape associated with that number of e- density regions correct? For example NH3 has 4 regions of electron density, one of which being a lone pair, but that doesn't make the sha...
by Sunjum Singh 1I
Fri Jun 01, 2018 1:19 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 7
Views: 175

Bond Angles

When it comes to determining bond angles for molecules, do we need to only know the main bond angles associated with the molecular shapes such as 120 or 109.5? Or are we going to need to remember the special cases Lavelle talked about in lecture like 104.5?
by Sunjum Singh 1I
Fri May 25, 2018 5:19 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angle
Replies: 6
Views: 135

Re: Bond Angle

Lavelle said in lecture that we don't need to know the exact value of the bond angles since they are experimentally calculated.
by Sunjum Singh 1I
Fri May 25, 2018 5:11 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar & Nonpolar
Replies: 3
Views: 90

Re: Polar & Nonpolar

It's based on the atoms electronegativity. So in the case of H20, we know oxygen is more electronegative(wanting more electrons) than hydrogen, so electrons are going to be pulled more towards oxygen. This causes hydrogen to become slightly positive and oxygen to be more negative. This is why H20 is...
by Sunjum Singh 1I
Tue May 22, 2018 8:35 pm
Forum: Lewis Structures
Topic: Chemical Formulas (test 3)
Replies: 2
Views: 73

Re: Chemical Formulas (test 3)

My TA said we're usually not expected to, but we should be familiar with the basic polyatomic ions.
by Sunjum Singh 1I
Sun May 20, 2018 12:34 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Relationship in periodic table and polarizability
Replies: 1
Views: 214

Re: Relationship in periodic table and polarizability

Polarizability has to do normally with anions while polarizing power has to do with cations. Normally, atoms that hold their electrons more loosely have higher polarizability, meaning their electron cloud will be easier distorted by a cation. When looking for polarizability, take account the size of...
by Sunjum Singh 1I
Sat May 19, 2018 1:09 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Oxidation numbers
Replies: 4
Views: 158

Oxidation numbers

What exactly are oxidation numbers and how do you find them for elements?
by Sunjum Singh 1I
Wed May 16, 2018 5:38 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Homework 3.25
Replies: 2
Views: 94

Homework 3.25

For number 25 in chapter 3, how do you know the charges and how do you go about solving these?
by Sunjum Singh 1I
Wed May 09, 2018 3:48 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty in Kinetic Energy
Replies: 1
Views: 114

Uncertainty in Kinetic Energy

How do you find the uncertainty in kinetic energy by using the uncertainty in velocity?
by Sunjum Singh 1I
Tue May 08, 2018 3:19 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Module #18
Replies: 3
Views: 171

Module #18

Can someone help me solve this? Also if anyone has some kind of system of steps on how they solve these that would be helpful, I'm having a hard time understanding the concepts of this equation and what everything means.
by Sunjum Singh 1I
Sat May 05, 2018 6:39 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: D and S oribitals
Replies: 3
Views: 79

D and S oribitals

So for all electron configurations of elements is the D-orbital always before the S-orbital?
by Sunjum Singh 1I
Sat May 05, 2018 2:06 pm
Forum: Limiting Reactant Calculations
Topic: Midterm Review Q2
Replies: 7
Views: 735

Re: Midterm Review Q2

So to solve this problem you first have to write out the equation given in the problem then balance it, getting 4NH3+5O2=>4NO+6H2O. Then you take the grams of NH3 and O2 given and find the moles, multiply it by the mole ratio in the equation to get mols NO, then convert to grams. You find that O2 yi...
by Sunjum Singh 1I
Thu May 03, 2018 5:34 pm
Forum: *Shrodinger Equation
Topic: Midterm [ENDORSED]
Replies: 2
Views: 166

Midterm [ENDORSED]

Is the Shrodinger Equation going to be tested on the midterm?
by Sunjum Singh 1I
Thu May 03, 2018 5:32 pm
Forum: Trends in The Periodic Table
Topic: Fixity in the trends [ENDORSED]
Replies: 2
Views: 76

Re: Fixity in the trends [ENDORSED]

Considering we haven't been taught any exceptions I wouldn't think it is something we'd need to worry about for the test. Also I've never heard of any exceptions either so I'm not sure if there even are any.
by Sunjum Singh 1I
Fri Apr 27, 2018 11:17 pm
Forum: Administrative Questions and Class Announcements
Topic: ATTACHING IMAGES TO POSTS? [ENDORSED]
Replies: 3
Views: 131

Re: ATTACHING IMAGES TO POSTS? [ENDORSED]

To attach images you can just drag the photo into the box or you can go down to where it says options and click the tab next to it that says attachments where you can add it.
by Sunjum Singh 1I
Tue Apr 24, 2018 5:18 pm
Forum: Photoelectric Effect
Topic: PreModule Question 30
Replies: 1
Views: 60

PreModule Question 30

How do you go about solving this? I'm having a hard time deciphering problems like these and figuring out the first steps to solving this problem.
by Sunjum Singh 1I
Tue Apr 24, 2018 4:23 pm
Forum: Photoelectric Effect
Topic: homework 1.25 part b
Replies: 3
Views: 73

Re: homework 1.25 part b

You're actually changing the number into mols in order to multiply by Avogadro's number and get the atoms of Na which you use in your equation to find the energy of the sodium atoms.
by Sunjum Singh 1I
Thu Apr 19, 2018 7:51 pm
Forum: Properties of Electrons
Topic: Example from Lecture #8 [ENDORSED]
Replies: 2
Views: 160

Re: Example from Lecture #8 [ENDORSED]

I don't fully understand the model either but to attach an image I usually just drag it into the comment box and it attaches the image and at the bottom it shows that it uploaded! Another way is if you scroll past the privacy waiver section there's a tab next to options that says "attachments&q...
by Sunjum Singh 1I
Mon Apr 16, 2018 9:46 pm
Forum: Empirical & Molecular Formulas
Topic: Creating a molecular/empirical formula
Replies: 3
Views: 155

Re: Creating a molecular/empirical formula

For molecular formula you count how many atoms there are of each, so in your example it would be C5 and depending on the amount of H atoms in the model it would be H(however many H atoms). To find empirical from there you find a number that could go into each subscript and still be left with a whole...
by Sunjum Singh 1I
Mon Apr 16, 2018 9:41 pm
Forum: Properties of Light
Topic: HW 1.15
Replies: 4
Views: 139

HW 1.15

For number 15 when finding the energy levels why do you assume when subtracting N1 from N2 that N1 is 1?
by Sunjum Singh 1I
Sun Apr 15, 2018 3:11 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect Expirement [ENDORSED]
Replies: 4
Views: 108

Photoelectric Effect Expirement [ENDORSED]

Can someone explain the experiment and it's significance? I didn't fully understand it in lecture.
by Sunjum Singh 1I
Fri Apr 13, 2018 6:33 pm
Forum: Photoelectric Effect
Topic: Equations in Quantum Mechanics [ENDORSED]
Replies: 3
Views: 110

Re: Equations in Quantum Mechanics [ENDORSED]

What I understood from it was that quantum mechanics deal with things that are generally small in value. It's needed to talk about the behaviors of small objects and the small amounts of energy they accept, such as electron energy levels and small particles of light. I'm not sure if that helps much ...
by Sunjum Singh 1I
Wed Apr 11, 2018 3:50 pm
Forum: Limiting Reactant Calculations
Topic: M.11
Replies: 8
Views: 267

M.11

What are the steps in solving for part b and c of number M.11?
by Sunjum Singh 1I
Wed Apr 11, 2018 3:45 pm
Forum: Empirical & Molecular Formulas
Topic: Molecular to Empirical [ENDORSED]
Replies: 12
Views: 360

Molecular to Empirical [ENDORSED]

When given the Molecular Formula, how do you find the empirical from it? A somewhat similar example is F.26 in the homework. Thanks.
by Sunjum Singh 1I
Sat Apr 07, 2018 6:07 pm
Forum: Balancing Chemical Reactions
Topic: Balancing equations with fractions [ENDORSED]
Replies: 13
Views: 380

Re: Balancing equations with fractions [ENDORSED]

Normally having a fraction isn't ideal, but you're right about multiplying the whole equation by 2 in order to cancel out the fraction and make everything whole numbers. So it would become 4NH3+5O(2)---->4NO+6H20 I believe.
by Sunjum Singh 1I
Fri Apr 06, 2018 6:08 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical formula [ENDORSED]
Replies: 3
Views: 107

Empirical formula [ENDORSED]

When solving for Empirical Formula and you have moles such as 2.5 or 2.7, how do you know which number is the best to multiply each by to get whole numbers?

Go to advanced search