## Search found 20 matches

Sun Dec 10, 2017 1:52 pm
Forum: Molarity, Solutions, Dilutions
Topic: Test 1 Question Q2B
Replies: 4
Views: 799

### Re: Test 1 Question Q2B

Yes the units for molarity are in liters, however I believe if the question is asking for the final volume in milliliters and you are given milliliters you can keep the number in milliliters so you do not have to convert the answer at the end!
Sun Dec 03, 2017 10:40 pm
Forum: Significant Figures
Topic: Basic Sig Figs
Replies: 13
Views: 1294

### Re: Basic Sig Figs

For significant figures it depends on if there is a decimal point. If there is a decimal point, then you go to the left most non-zero digit of the number of count the amount of digits to the right of that first non-zero number. For example 0.0500 would have three sig figs because five is the first n...
Sun Dec 03, 2017 10:31 pm
Forum: Resonance Structures
Topic: Delocalized
Replies: 7
Views: 568

### Re: Delocalized

Hello!
I also believe that it means it does not have a set conformation and is spread across multiple bonds!
Sun Dec 03, 2017 10:18 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Lewis Structures and Formal Charge
Replies: 7
Views: 868

### Re: Lewis Structures and Formal Charge

Hello! Even if the question does not ask you to find the formal charge, it is best to calculate it anyways because even though the lewis structure could have the right amount of bonds, that does not mean it is the most stable lewis structure. Therefore, you want to make sure the lewis structure you ...
Sat Nov 25, 2017 1:30 pm
Forum: Ionic & Covalent Bonds
Topic: Polar/Nonpolar Bond vs Molecule [ENDORSED]
Replies: 3
Views: 518

### Re: Polar/Nonpolar Bond vs Molecule[ENDORSED]

The polarity of a bond refers to one specific bond and the differences between their electronegativity. The polarity of a molecule refers the the molecule as a whole. Therefore, a non-polar molecule can contain polar bonds if the dipoles cancel out!
Sat Nov 25, 2017 1:29 pm
Forum: Sigma & Pi Bonds
Topic: Pi bonds
Replies: 6
Views: 1002

### Re: Pi bonds

So does that mean that if there is a sigma bond, there will always be a pi bond as well?
Sat Nov 25, 2017 1:28 pm
Forum: Quantum Numbers and The H-Atom
Topic: Valence electrons [ENDORSED]
Replies: 7
Views: 652

### Re: Valence electrons[ENDORSED]

Hello everyone!
Yes, all of those electrons are valence electrons so it is important to know that all of those electrons play a role in how the element forms chemical bonds with other elements!
Sat Nov 25, 2017 1:26 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sigma bonds versus Pi bonds
Replies: 1
Views: 412

### Sigma bonds versus Pi bonds

Can someone please expand how you determine which bond is a sigma bond versus which is a pi bond? I understand bonds have overlapping orbitals side-by-side, but I am confused how you determine the bonds from a lewis structure?
Mon Nov 20, 2017 3:25 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Question 4.13 a
Replies: 3
Views: 326

### Question 4.13 a

In the homework question 4.13a, why would the shape of (I3)- be linear when it has two bonded pairs and three lone pairs on the central atom? Why would it not be bent?
Mon Nov 20, 2017 2:33 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Homework Question 11.7 [ENDORSED]
Replies: 4
Views: 390

### Homework Question 11.7[ENDORSED]

In question 11.7, it gives you four different flasks containing different concentrations of both products and the reactants. Can someone explain how you would decipher which flask is at equilibrium? Thank you so much!
Sun Nov 05, 2017 6:40 pm
Forum: Dipole Moments
Topic: Polarity vs Non-Polarity
Replies: 3
Views: 436

### Re: Polarity vs Non-Polarity

Expanding on the other responses, you can look for symmetry for the molecule, meaning that if there are unequal sharing of electrons but in opposite directions, the polarity will cancel out. It is important to remember that unpaired electrons repel other bonds so it is best to compare electronegativ...
Sun Nov 05, 2017 6:37 pm
Forum: Lewis Structures
Topic: Formal charge [ENDORSED]
Replies: 3
Views: 311

### Formal charge[ENDORSED]

In order to find the most stable bond, do you make numerous different lewis structures and calculate which have the most bonds with a formal charge of 0?
Sun Oct 29, 2017 6:27 pm
Forum: *Shrodinger Equation
Topic: Using Shrodinger's Equation
Replies: 4
Views: 599

### Re: Using Shrodinger's Equation

Hello!
In my discussion my TA said you would have to know how to apply the equation using the concepts but not mathematically derive the equation! Hope that helps!
Sun Oct 29, 2017 6:26 pm
Forum: Trends in The Periodic Table
Topic: f-orbitals
Replies: 6
Views: 2545

### Re: f-orbitals

Hello everyone!
For the electron configuration of elements in the 5d level, would you first include 4F^14 before the 5d block? For example, how would you do the electron configuration for Tungsten? Thank you so much!
Thu Oct 19, 2017 10:31 am
Forum: Trends in The Periodic Table
Topic: Cation vs Anion Size [ENDORSED]
Replies: 3
Views: 1333

### Re: Cation vs Anion Size[ENDORSED]

Hello! To determine which anion is bigger, refer to the atomic radii trends for the parent ions on the periodic table. Therefore, the atomic radius and therefore the anion size will increase down a family and increase across a row! Remember that anions are larger than the parent ion however by looki...
Thu Oct 19, 2017 10:27 am
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Numbers
Replies: 4
Views: 537

### Re: Quantum Numbers

Hello!
I believe that it is +1/2 snd -1/2 because the signs represent the orientation of the spinning electron. The negative indicates that the electron is spinning downwards while the positive 1/2 represents the electron spinning upwards. I hope that helps!
Sun Oct 15, 2017 5:53 pm
Forum: Photoelectric Effect
Topic: Mass of electron for kinetic energy [ENDORSED]
Replies: 1
Views: 198

### Mass of electron for kinetic energy[ENDORSED]

When using the kinetic energy equation, will the mass of the electron be provided or will the kinetic energy itself be provided? If the mass of the electron is not given, how can you calculate the kinetic energy of the electron?
Sun Oct 15, 2017 5:48 pm
Forum: Properties of Light
Topic: Photons
Replies: 7
Views: 487

### Re: Photons

Hello everyone! Also, it is important to remember that different photons of different particles have different frequency. So, a beam of red light contains small photons, or packets of energy, all consisting of the same energy. Moreover, the intensity of the radiation indicates the number of photons ...
Sun Oct 08, 2017 7:51 pm
Forum: SI Units, Unit Conversions
Topic: Significant Figures [ENDORSED]
Replies: 9
Views: 1192

### Re: Significant Figures[ENDORSED]

Additionally, do not forget there are certain rules when dividing by sigfig. The rule is your answer should have the same amount of sigfigs as the number with the least amount of significant figures!
Sun Oct 08, 2017 7:50 pm
Forum: Molarity, Solutions, Dilutions
Topic: Writing formulas
Replies: 4
Views: 460

### Re: Writing formulas

Hello! I believe that we will not be expected to know how to write these formulas! I think Dr. Lavelle will lecture on writing chemical formulas in the future!

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