Search found 14 matches

by janessadai 1F
Sat Nov 24, 2018 7:08 pm
Forum: Hybridization
Topic: Hybridization
Replies: 1
Views: 45

Re: Hybridization

Draw out the Lewis structure of the molecule and you can determine the hybridization through the shape made by the electron dense regions, which include both lone pairs and bond pairs. So a molecule with three electron dense regions (eg. AX3, AX2E) would have a trigonal planar shape and sp2 hybridis...
by janessadai 1F
Sat Nov 24, 2018 7:02 pm
Forum: Hybridization
Topic: double bonds
Replies: 14
Views: 225

Re: double bonds

A sigma bond involves end-to-end overlapping of electron orbitals while pi bond involves overlapping of orbitals sideways. A pi bond does not consist of a sigma bond; a double bond consists of both sigma and pi bonds.
by janessadai 1F
Sat Nov 24, 2018 6:57 pm
Forum: Hybridization
Topic: hybridization problems
Replies: 4
Views: 79

Re: hybridization problems

You should draw the Lewis structure of the molecule first. You can determine the hybridization by looking at the electron densities (i.e. both the lone pairs and bond pairs)
by janessadai 1F
Sat Oct 27, 2018 2:06 pm
Forum: Trends in The Periodic Table
Topic: electron affinity 1F.11
Replies: 3
Views: 122

Re: electron affinity 1F.11

But why is that not the case for Be/Mg and Ga/In?
by janessadai 1F
Tue Oct 23, 2018 3:54 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: f-orbitals
Replies: 2
Views: 89

f-orbitals

I understand that (n+1)s orbital is filled before the nd orbital (ie 4s before 3d), but what about the f orbitals? When do the f orbitals get filled when we are determining electronic configuration (of Ba or Au for example)?
by janessadai 1F
Tue Oct 23, 2018 3:47 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electronic Config of tungsten (1E.13)
Replies: 1
Views: 107

Electronic Config of tungsten (1E.13)

The electronic configuration of tungsten as stated in the solutions is [Xe] 4f14 5d4 6s2. Why is it not [Xe] 4f14 5d5 6s1, like Cr:[Ar] 3d5 4s1?
by janessadai 1F
Tue Oct 23, 2018 3:43 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 1E.13 7th Edition
Replies: 3
Views: 62

Re: 1E.13 7th Edition

Half full d5 and d10 subshells have lower energy and hence are more stable
by janessadai 1F
Mon Oct 15, 2018 9:07 am
Forum: Properties of Light
Topic: Speed of Light
Replies: 41
Views: 742

Re: Speed of Light

The speed of light is always constant, and we are provided the value during tests and exams so we can just use whatever value they give us
by janessadai 1F
Mon Oct 15, 2018 9:04 am
Forum: Properties of Light
Topic: Light Intensity
Replies: 4
Views: 198

Re: Light Intensity

The difference between energy per photon E(photon) and the energy needed to remove an electron E(e-) would give you the kinetic energy E(k).
E(photon) - E(e-) = E(k)
In turn, E(k) = 1/2 MV^2, where M is the mass of the electron and V is the velocity of the electron.
by janessadai 1F
Thu Oct 11, 2018 3:51 pm
Forum: Photoelectric Effect
Topic: Threshold energy
Replies: 5
Views: 261

Re: Threshold energy

In the case of this equation, work function (referring to the energy needed to be put in) and threshold energy (referring to the frequency needed to eject an electron) can be used interchangeably.
by janessadai 1F
Thu Oct 11, 2018 3:47 pm
Forum: Photoelectric Effect
Topic: Work function
Replies: 7
Views: 145

Re: Work function

I think they are interchangeable when calculating with the equation even though they have slight differences. (work function is the energy that needs to be put in, while threshold energy is the frequency required to eject an electron)
by janessadai 1F
Tue Oct 09, 2018 3:15 pm
Forum: Photoelectric Effect
Topic: Photoelectric Experiment
Replies: 2
Views: 62

Photoelectric Experiment

What happens to the electrons that are displaced during the experiment? Does the metal end up with a slight positive charge?
by janessadai 1F
Tue Oct 02, 2018 11:37 pm
Forum: Significant Figures
Topic: Periodic Table Sig Figs
Replies: 4
Views: 169

Re: Periodic Table Sig Figs

But in that case, does the number of sig fig for the final answer depend on what is provided in the question or the number of sig fig in the periodic table?
by janessadai 1F
Tue Oct 02, 2018 11:32 pm
Forum: Molarity, Solutions, Dilutions
Topic: Units when calculating volume
Replies: 4
Views: 111

Units when calculating volume

I understand that Dr Lavelle mentioned during the lecture that we have to use the units "L" for volume in our workings when using the equation Minitial Vinitial = Mfinal Vfinal (because the units for M is mol/L), but seeing that the equation is almost like a ratio between volume and molari...

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