Search found 30 matches

by Rithana Srikanth 3L
Fri Dec 07, 2018 1:59 pm
Forum: Ionic & Covalent Bonds
Topic: Inter and Intramolecular Forces
Replies: 3
Views: 131

Re: Inter and Intramolecular Forces

Intramolecular forces are those that bind the atoms within the molecule. Intermolecular forces bind the molecules together.
by Rithana Srikanth 3L
Fri Dec 07, 2018 1:58 pm
Forum: Bronsted Acids & Bases
Topic: Lewis Acids and Bases and Bronsted?
Replies: 5
Views: 104

Re: Lewis Acids and Bases and Bronsted?

Lewis acids are electron acceptors, Lewis bases are electron donors. Bronsted acids are proton donors, Bronsted bases are proton acceptors. For Lewis acids/bases, you can usually tell by looking at the Lewis structure. For Bronsted acids/bases, you can tell by whether they form ions by accepting or ...
by Rithana Srikanth 3L
Fri Dec 07, 2018 1:56 pm
Forum: Lewis Acids & Bases
Topic: Weak Acids/Bases?
Replies: 5
Views: 133

Re: Weak Acids/Bases?

Examples of weak acids - CH3COOH, H3PO4, HF Examples of weak bases - NH3, C5H5N, NH4OH Weak bases are only partially protonated in solution. Most of the examples of strong/weak acids and bases you just have to memorize. However, for weak acids there are a few guidelines to distinguish them, such as ...
by Rithana Srikanth 3L
Fri Nov 30, 2018 4:28 pm
Forum: Electronegativity
Topic: Exceptions
Replies: 7
Views: 253

Re: Exceptions

There are no major exceptions that we need to be aware of - knowing the general periodic trends should be enough.
by Rithana Srikanth 3L
Fri Nov 30, 2018 4:20 pm
Forum: Dipole Moments
Topic: Molecular Geometry and polarity
Replies: 5
Views: 103

Re: Molecular Geometry and polarity

It depends - if atoms of two different elements are attached to the central one, then it will be polar.
by Rithana Srikanth 3L
Fri Nov 30, 2018 4:17 pm
Forum: Sigma & Pi Bonds
Topic: Triple bond?
Replies: 18
Views: 465

Re: Triple bond?

A triple bond has 1 sigma and 2 pi bonds.
by Rithana Srikanth 3L
Mon Nov 26, 2018 10:08 am
Forum: Hybridization
Topic: Hybridization
Replies: 2
Views: 47

Re: Hybridization

I think it can go into higher f and g orbitals, but we are not required to know those.
by Rithana Srikanth 3L
Mon Nov 26, 2018 10:05 am
Forum: Ionic & Covalent Bonds
Topic: Resonance
Replies: 3
Views: 101

Re: Resonance

Normally, you just draw the Lewis structure for the molecule and then check if there are multiple possible positions for a double/triple bond, which means that there can be more than one Lewis structure.
by Rithana Srikanth 3L
Mon Nov 26, 2018 10:03 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Organic Molecules
Replies: 4
Views: 79

Re: Organic Molecules

No, I think you apply the same method to organic molecules.
by Rithana Srikanth 3L
Sun Nov 18, 2018 4:53 pm
Forum: Hybridization
Topic: Sigma and Pi Bonds [ENDORSED]
Replies: 12
Views: 244

Re: Sigma and Pi Bonds [ENDORSED]

The shapes of sigma bonds are more spherical, whereas pi bonds look like a dumbbell with the lobes on either end of the bond axis.
by Rithana Srikanth 3L
Sun Nov 18, 2018 4:46 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration of Rutherfordium
Replies: 2
Views: 120

Re: Electron Configuration of Rutherfordium

If you count the electrons in that electron configuration, it adds up to 90, which is the atomic number of Thorium. However, you are right that Thorium is in the 5f block; I don't fully understand that part either.
by Rithana Srikanth 3L
Sun Nov 18, 2018 4:42 pm
Forum: Dipole Moments
Topic: Identifying whether there is a dipole moment
Replies: 4
Views: 120

Re: Identifying whether there is a dipole moment

I think they would just expect us to be able to figure it out based on the periodic trends and our general knowledge of electronegativities.
by Rithana Srikanth 3L
Fri Nov 09, 2018 10:57 am
Forum: Resonance Structures
Topic: Resonance of Ozone
Replies: 3
Views: 117

Re: Resonance of Ozone

You should say it only has one type of bond, because it has equal electron distribution throughout the structure, making all its bond lengths and bond strengths equal.
by Rithana Srikanth 3L
Fri Nov 09, 2018 10:56 am
Forum: Octet Exceptions
Topic: octet exceptions
Replies: 4
Views: 124

Re: octet exceptions

Elements that can have expanded octet include P, S, Cl - elements from Period 3 and beyond. This is because these elements have d-orbitals that can expand to accommodate more electrons.
by Rithana Srikanth 3L
Fri Nov 09, 2018 10:53 am
Forum: Trends in The Periodic Table
Topic: Bond Lenghts
Replies: 7
Views: 370

Re: Bond Lenghts

I think you would have to draw the Lewis structure to figure it out.
by Rithana Srikanth 3L
Thu Nov 01, 2018 12:20 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Losing Electrons
Replies: 2
Views: 70

Re: Losing Electrons

They would lose electrons from 4p first, because the 4 shell is farther from the nucleus than the 3 shell, and the outermost electrons get removed first.
by Rithana Srikanth 3L
Thu Nov 01, 2018 12:18 pm
Forum: Ionic & Covalent Bonds
Topic: Finding out the likely ion that forms
Replies: 2
Views: 60

Re: Finding out the likely ion that forms

It's difficult to predict the most likely ion that would form, because they can take several different oxidation states. I think just having a general idea of the possible transition metal oxidation states (+1, +2, +3, etc) is enough.
by Rithana Srikanth 3L
Thu Nov 01, 2018 12:13 pm
Forum: Resonance Structures
Topic: Definition of resonance
Replies: 7
Views: 128

Re: Definition of resonance

Resonance is a way of describing the electron distribution in molecules with more than one Lewis structure. The resonance hybrid is just a blending of different Lewis structures, such that the electrons are distributed equally across all the bonds instead of being in single/double bonds.
by Rithana Srikanth 3L
Fri Oct 26, 2018 10:18 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Exceptions to Trends
Replies: 3
Views: 101

Re: Exceptions to Trends

Half-filled and completely filled d orbitals have lower energy which makes them more stable, hence electrons will tend to rearrange themselves towards this state. In chromium and copper, an electron is excited from the 4s orbital to the 3d orbital in order to make the 3d orbital half filled (in the ...
by Rithana Srikanth 3L
Fri Oct 26, 2018 10:13 am
Forum: DeBroglie Equation
Topic: Measurable wavelength properties
Replies: 5
Views: 196

Re: Measurable wavelength properties

"Measurable wavelike properties" just means wave movement that is noticeable/detectable in a lab. The cutoff point for wavelength detection is 10^-18. In this case, since the object is very big, the wavelength wouldn't be measurable.
by Rithana Srikanth 3L
Fri Oct 26, 2018 9:54 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration Help
Replies: 3
Views: 88

Re: Electron Configuration Help

Khan Academy is usually a good resource, maybe these would help: https://www.khanacademy.org/science/chemistry/electronic-structure-of-atoms/electron-configurations-jay-sal/v/more-on-orbitals-and-electron-configuration https://www.khanacademy.org/test-prep/mcat/physical-processes/electronic-structur...
by Rithana Srikanth 3L
Fri Oct 19, 2018 11:20 am
Forum: Properties of Electrons
Topic: Rydberg Formula 1.13
Replies: 3
Views: 103

Re: Rydberg Formula 1.13

For this equation, the Rydberg constant is 3.29 x 10^15 Hz.
by Rithana Srikanth 3L
Fri Oct 19, 2018 11:18 am
Forum: Properties of Light
Topic: Do I have to memorize the spectrum?
Replies: 20
Views: 393

Re: Do I have to memorize the spectrum?

You should probably know the visible light range, and which radiations have the highest and lowest frequencies/energies/wavelengths.
by Rithana Srikanth 3L
Fri Oct 19, 2018 11:08 am
Forum: *Shrodinger Equation
Topic: Orbitals, Lobes, e- density
Replies: 3
Views: 294

Re: Orbitals, Lobes, e- density

The wave function is a mathematical representation of the wave motion of the electron, which describes the position and state of the electron. Squaring the wave function gives you the probability of finding an electron in a given region. Orbital and wave function mean the same thing, they can be use...
by Rithana Srikanth 3L
Wed Oct 10, 2018 7:06 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Bohr Relation to H-Atom
Replies: 1
Views: 24

Re: Bohr Relation to H-Atom

This particular formula was developed based on experimental data for the Hydrogen atom. I believe a more complex equation is needed for multi-electron atoms because of the variation caused by electron-electron repulsion.
by Rithana Srikanth 3L
Wed Oct 10, 2018 7:00 pm
Forum: Einstein Equation
Topic: Work Function
Replies: 4
Views: 95

Re: Work Function

The work function represents the threshold energy, or the minimum energy required to remove an electron from a metal.
by Rithana Srikanth 3L
Wed Oct 10, 2018 6:53 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Distinguishing the Balmer and Lyman Series
Replies: 1
Views: 58

Re: Distinguishing the Balmer and Lyman Series

The Lyman series consists of the emission lines in the hydrogen spectrum that occur when electrons move to the lowest energy level (n = 1). These wavelengths are all in the UV region. Similarly, the Balmer series represents electrons moving to the second energy level (n = 2). These wavelengths are i...
by Rithana Srikanth 3L
Thu Oct 04, 2018 5:14 pm
Forum: Empirical & Molecular Formulas
Topic: Question F9
Replies: 5
Views: 125

Re: Question F9

I believe you should answer in the form of a ratio.
by Rithana Srikanth 3L
Thu Oct 04, 2018 2:28 pm
Forum: SI Units, Unit Conversions
Topic: pm to m
Replies: 6
Views: 363

Re: pm to m

I think so, given that it was taught in lecture. It would probably be more convenient to memorize the conversions anyway, because it would make calculations much faster.
by Rithana Srikanth 3L
Thu Oct 04, 2018 2:26 pm
Forum: Balancing Chemical Reactions
Topic: H3, coefficients
Replies: 7
Views: 195

Re: H3, coefficients

I think you should be fine, because the equation is balanced, and it does make more sense to write the coefficients as the lowest whole numbers.

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