CHEMISTRY COMMUNITY

Jack Dias

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...

Jack Dias

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.

Jack Dias

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...

Jack Dias

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...

Jack Dias

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...

Jack Dias

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...

Jack Dias

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...

Jack Dias

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...

Jack Dias

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)

CHEMISTRY COMMUNITY

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Re: Any Other Shapes?

Re: Energy vs Intensity

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