Search found 9 matches

by Jack Dias
Tue May 29, 2018 4:49 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Any Other Shapes?
Replies: 7
Views: 520

Re: Any Other Shapes?

We will most likely need to know the "Bent" shape, which is what water is. It would be a tetrahedron but its bond angles are different due to the lone pair of electrons acting as one of the regions of electron density. I would at least remember that lone electron pairs have a different eff...
by Jack Dias
Wed May 09, 2018 10:27 am
Forum: Properties of Light
Topic: Energy vs Intensity
Replies: 4
Views: 300

Re: Energy vs Intensity

As far as I know they are interchangeable, or at least intensity is used to describe how energetic a particle is. Remember that a shorter wavelength and higher frequency makes a particle more energetic and more intense.
by Jack Dias
Sat May 05, 2018 11:01 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm Topics [ENDORSED]
Replies: 33
Views: 2765

Re: Midterm Topics [ENDORSED]

We do not need to know any details of significant figures outside of the very basics. For example, if we observe the speed of light as 3.0 x 10^8 m/s, then we have 2 sigfigs. If it says 3.00, then it's 3 sigfigs. When there's a situation where there are multiple numbers listed with different amounts...
by Jack Dias
Sun Apr 22, 2018 4:53 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg [ENDORSED]
Replies: 5
Views: 404

Re: Rydberg [ENDORSED]

In addition, since we are solving for wavelength in this case, it can be extended to equations such as E=lambda X mu (energy=wavelength times frequency) and other equations that we will need to know for the test. It is very important that we know how to relate different formulas to each other by mes...
by Jack Dias
Sun Apr 22, 2018 4:48 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Problem 1.15 Textbook
Replies: 6
Views: 396

Re: Problem 1.15 Textbook

Yes, you will want to phrase it as "Initial=3, final=1". This is because the energy is emitted, which only happens when the energy level drops, in this case, 3 to 1. The energy of course is released from the atom and then observed. Make sure you have the energy as negative for the atom (be...
by Jack Dias
Sun Apr 22, 2018 4:44 pm
Forum: Properties of Electrons
Topic: electron mass
Replies: 15
Views: 869

Re: electron mass

Yes, its mass will be important to know for the test. It may be given to us but I wouldn't rely on that. The mass isn't considered for stuff like the atomic mass, as only protons and neutrons are considered due to their much greater mass, but for our upcoming case it is imperative to consider the el...
by Jack Dias
Tue Apr 10, 2018 10:41 pm
Forum: Properties of Light
Topic: Need help on 1.4
Replies: 2
Views: 201

Re: Need help on 1.4

Hi, It is important to keep in mind the key ideas of wavelength, frequency, etc; for example, if light has a small wavelength, what does this indicate about its amount of energy? I think it would be helpful to know which colors have higher and lower energies. Remember the acronym ROY G BIV (Red, ora...
by Jack Dias
Tue Apr 10, 2018 10:31 pm
Forum: Significant Figures
Topic: Scientific notation [ENDORSED]
Replies: 7
Views: 550

Re: Scientific notation [ENDORSED]

Hi, Professor Lavelle stated that significant figures would not be a concern for the purposes of Chem 14A; it isn't something to be concerned with generally. That said, I advise that you keep your final answer limited, like what Gianna's TA said, and in addition, I would avoid rounding/simplifying u...
by Jack Dias
Tue Apr 10, 2018 10:27 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8241
Views: 1437522

Re: Post All Chemistry Jokes Here

Two men walk into a chemistry-themed bar. The first man asks for a glass of H2O. The second man says, "I'll have a glass of H20, too". The second man has to go to the hospital.

(H202 aka dihydrogen dioxide aka not actually water the bartender got bamboozled)

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