Search found 33 matches

by Bijal Luhar
Tue Jun 05, 2018 3:08 am
Forum: Ideal Gases
Topic: Ideal gases
Replies: 3
Views: 215

Re: Ideal gases

Yes, assume ideal unless otherwise stated.
by Bijal Luhar
Tue Jun 05, 2018 3:07 am
Forum: Hybridization
Topic: Hybrid Orbitals
Replies: 5
Views: 212

Re: Hybrid Orbitals

Most likely not. They are not heavily emphasized in this class.
by Bijal Luhar
Tue Jun 05, 2018 3:07 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Trigonal Planar vs Trigonal Pyramidal
Replies: 5
Views: 2596

Re: Trigonal Planar vs Trigonal Pyramidal

Trigonal pyramidal has a lone pair at the central atom! While trigonal planar does not.
by Bijal Luhar
Tue Jun 05, 2018 3:03 am
Forum: Electronegativity
Topic: Periodic Trends
Replies: 8
Views: 215

Re: Periodic Trends

No, there are no exceptions. However just remember that the most electronegative is F>O>Cl>N
by Bijal Luhar
Thu May 31, 2018 2:07 pm
Forum: Ionic & Covalent Bonds
Topic: Help on 3.33
Replies: 1
Views: 127

Re: Help on 3.33

I have posted the lewis structure. Here C is the central atom and then we would place CL and O around. Place single bonds first. Then place the dots around each element. From here we can see that both CL's have a formal charge of 0. However O has a formal charge of +1 and in order to fix this we mus...
by Bijal Luhar
Thu May 31, 2018 1:56 pm
Forum: Resonance Structures
Topic: Resonance Review
Replies: 3
Views: 241

Re: Resonance Review

Resonance is basically when lets say you have 3 oxygen atoms and two of them have 2 pairs of dots and the other has three pair of the dots. In an resonance structure you can basically rotate the one with the three pairs of dots so each oxygen has the opportunity to get the three pairs of dots. You c...
by Bijal Luhar
Thu May 31, 2018 1:52 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR shape and bond angles
Replies: 5
Views: 195

Re: VSEPR shape and bond angles

I believe here you would be looking at the strengths of the bonds as a stronger bond would pull closer in one direction and therefore create a smaller angle.
by Bijal Luhar
Thu May 31, 2018 1:49 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR AXE
Replies: 4
Views: 154

Re: VSEPR AXE

No, these are all the possible AXE configurations;
by Bijal Luhar
Wed May 23, 2018 9:19 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Dipole moments
Replies: 3
Views: 274

Re: Dipole moments

Dipole Moments: Compare the electronegativities between the bonds. The one that has is the most electronegative gets the sigma - while the least electronegative of the pair gets the sigma +. We draw dipole moments towards the element with the sigma -.
by Bijal Luhar
Tue May 22, 2018 11:49 am
Forum: Bond Lengths & Energies
Topic: Test 3 Material Question
Replies: 3
Views: 239

Test 3 Material Question

Is Test 3 covering everything in this section (Chemical Bonds) of chemistry community? Does anyone know the list of specific topics we must must completely understand?
by Bijal Luhar
Tue May 22, 2018 11:47 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Trend for Polarizing Power of Cations and Anions
Replies: 1
Views: 368

Trend for Polarizing Power of Cations and Anions

Can someone briefly explain the trend we follow in order to determine higher polarizing power of cations and anions?
by Bijal Luhar
Tue May 22, 2018 11:44 am
Forum: Lewis Structures
Topic: OH Bonds
Replies: 2
Views: 92

OH Bonds

If we are given O and H along with any other element in an chemical formula do we automatically pair O and H together? Is this always true, or are there exceptions? Can someone explain why?
by Bijal Luhar
Sun May 20, 2018 6:42 pm
Forum: Ionic & Covalent Bonds
Topic: Properties of Hydrogen
Replies: 3
Views: 115

Re: Properties of Hydrogen

I don't believe hydrogen would have any metal like properties.
by Bijal Luhar
Sun May 20, 2018 6:41 pm
Forum: Lewis Structures
Topic: Dots vs lines to represent electrons
Replies: 8
Views: 282

Re: Dots vs lines to represent electrons

Lines represent bonds. Dots represent lone electrons.
by Bijal Luhar
Sun May 20, 2018 6:39 pm
Forum: Ionic & Covalent Bonds
Topic: How to tell which elements will be most likely to form a covalent bond
Replies: 8
Views: 249

Re: How to tell which elements will be most likely to form a covalent bond

Ionic bonds are usually created by a metal and a non metal! It is usually a good rule of thumb.
by Bijal Luhar
Thu May 10, 2018 11:23 pm
Forum: Quantum Numbers and The H-Atom
Topic: Midterm Question
Replies: 13
Views: 478

Midterm Question

On the midterm one of the questions asked was what is the subshell notation and the amount of orbitals? What did they mean amount of orbitals?
by Bijal Luhar
Thu May 10, 2018 11:21 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: H-Atom
Replies: 3
Views: 210

Re: H-Atom

You would only use the R value in the case of using the Bohr model equation and that equation directly related to energy regarding H atoms
by Bijal Luhar
Thu May 10, 2018 11:06 pm
Forum: Resonance Structures
Topic: Help on 2.51
Replies: 3
Views: 156

Re: Help on 2.51

Hello, a. the first step in solving these problem is writing out the full electron configuration; Bi: [Xe] 6s2 5d10 6p3 -From here we see that the S orbital is completely filled with its 2 electrons, we see that the D orbital is completely filled with its own 10 electrons, however we notice that the...
by Bijal Luhar
Tue May 01, 2018 1:29 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Atom Size (Periodicity of Atomic properties)
Replies: 2
Views: 97

Re: Atom Size (Periodicity of Atomic properties)

I wouldn't really worry about this because I think its beyond the scope. Just know the fact that atom size decreases from left to right and increases from top to bottom.
by Bijal Luhar
Tue May 01, 2018 1:27 pm
Forum: Balancing Chemical Reactions
Topic: Why didn't we take into account charges
Replies: 4
Views: 198

Why didn't we take into account charges

I was wondering why when we were learning to balance equations, why didn't we take into account charges of elements. Because you are supposed to balance coefficients and the charge.
by Bijal Luhar
Tue May 01, 2018 1:23 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: The order for s,p,d
Replies: 3
Views: 141

The order for s,p,d

In high school I was always taught that we go from s to p to d and thats how we would write the electron configuration, which makes sense because that's the order you go in when looking at a periodic table when determining electron configuration. Why in this class are we changing the order from s,p,...
by Bijal Luhar
Tue Apr 24, 2018 2:09 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect
Replies: 12
Views: 378

Re: Photoelectric Effect

In order for the photon to be emitted, there must be enough energy to either exceed or equal the threshold necessary.
by Bijal Luhar
Tue Apr 24, 2018 2:07 pm
Forum: DeBroglie Equation
Topic: When to use DeBroglie or Ek equation
Replies: 7
Views: 298

Re: When to use DeBroglie or Ek equation

You use DeBrogile when given a mass value.
by Bijal Luhar
Tue Apr 24, 2018 2:05 pm
Forum: Properties of Light
Topic: Test 2 Material
Replies: 12
Views: 412

Re: Test 2 Material

We will just be strictly tested on 1.1-1.5.
by Bijal Luhar
Wed Apr 18, 2018 6:35 pm
Forum: DeBroglie Equation
Topic: Measurable Wavelike Properties
Replies: 2
Views: 131

Re: Measurable Wavelike Properties

In order to have measurable wavelenght properties it must be greater than 10^-18th
by Bijal Luhar
Wed Apr 18, 2018 6:35 pm
Forum: DeBroglie Equation
Topic: Measurable Wavelike properties
Replies: 3
Views: 125

Re: Measurable Wavelike properties

Dr. Lavelle stated that the threshold to detect is anything greater than 10^-18. If it is less than this, it will be too small to detect.
by Bijal Luhar
Wed Apr 18, 2018 6:33 pm
Forum: Properties of Light
Topic: HW 1.7 (using nm vs pm)
Replies: 8
Views: 270

Re: HW 1.7 (using nm vs pm)

The units the question asks for does not ultimately change the ultimate answer, it is just a specification they have.
by Bijal Luhar
Thu Apr 12, 2018 10:24 am
Forum: Empirical & Molecular Formulas
Topic: Molecular to Empirical [ENDORSED]
Replies: 12
Views: 470

Re: Molecular to Empirical [ENDORSED]

To go from molecular formula to empirical formula you basically divide by the greatest common factor of all the elements. Remember that empirical formulas are ratios of the molecular. For example, C10H20O5 the greatest common factor of 10,20,and 5 is 5. So you divide all those coefficients by 5 and ...
by Bijal Luhar
Thu Apr 12, 2018 10:21 am
Forum: Properties of Light
Topic: HW 1.7 (speed of light) clarification
Replies: 4
Views: 134

Re: HW 1.7 (speed of light) clarification

Always use the most precise information. Dr. Lavelle stated that 3.0 is an rounded figure, the 2.988 will give you a more precise and accurate answers!
by Bijal Luhar
Thu Apr 12, 2018 10:17 am
Forum: SI Units, Unit Conversions
Topic: Sig Figs
Replies: 9
Views: 387

Re: Sig Figs

When we get into the part of class when sig figs matter always use the exact number on the periodic table as it gives the most accurate and precise answer!
by Bijal Luhar
Thu Apr 12, 2018 10:17 am
Forum: Molarity, Solutions, Dilutions
Topic: When to use MiVi=MfVf
Replies: 8
Views: 619

Re: When to use MiVi=MfVf

One of the best ways to know when to use an certain equation is to write out was is given in the problem. For example, if they give you a volume and concentration and want you to find the concentration when you have a certain amount of volume. Then it would be safe to assume M1V1=M2V2. Basically jus...
by Bijal Luhar
Wed Apr 11, 2018 8:43 am
Forum: Significant Figures
Topic: Scientific notation [ENDORSED]
Replies: 7
Views: 368

Re: Scientific notation [ENDORSED]

Hello,

You never have to answer in scientific notation unless it is specifically stated in the question. It is a personal preference, because sometimes people rather write .0000005 as 5x10^-7 just because it is easier. Sig figs are an important concept and you should always use them!
by Bijal Luhar
Wed Apr 11, 2018 8:40 am
Forum: SI Units, Unit Conversions
Topic: Units for Answer
Replies: 10
Views: 471

Re: Units for Answer

Hello,

A majority of the time you will not be docked points unless it specifically asks you to convert to KG. After all, a certain amount of grams will weigh the same amound in kilograms. Therefore, just read the question thoroughly and if it doesn't ask for anything specific don't worry about it!

Go to advanced search