CHEMISTRY COMMUNITY

Theo Teske 3B

On a conceptual level, a wave with higher frequency will transmit more energy over a given time period simply because more wavelengths are passing by over the given time period.

Theo Teske 3B

It's important to note that the Heisenberg uncertainty equation states that the product of the uncertainty in momentum (mass times velocity) and the uncertainty in position will be greater than or equal to h/(4pi). Any "large object" will likely have a mass that's much greater than h/(4pi)...

Theo Teske 3B

The photoelectric effect got its name because they discovered that light does not behave like a classical wave. Instead, it is easier to treat it like packets of energy (photons). It also found that a certain amount of energy is needed for an electron to be released from the metal. That is how it g...

Theo Teske 3B

Can you determine wavelength and frequency with only nm? I'm guessing that by nm you're referring to a wavelength. If so, the answer is yes; frequency and wavelength are related to each other in that their product is equal to c, the speed of light. Because c is a constant, if we're given a waveleng...

Theo Teske 3B

To add on, R is known as the Rydberg constant, and is approximately 2.179 x 10^(-18) Joules.

Theo Teske 3B

Hailey Jeon wrote:percentage yield = (actual yield/theoretical yield) x 0.01
Percentage yield represents the ratio between actual yield to theoretical yield.

Rather than dividing by 100 (or multiplying by 0.01), calculating percent yield actually requires multiplying by 100.

Theo Teske 3B

My understanding is that the quantum description of atoms uses orbitals, or electron clouds, to describe volumes of space in which there is likely to be an electron. The probabilistic nature of this description is what makes it uniquely "quantum." In this class, I've also noted that the qu...

Theo Teske 3B

Some things I try to remember are that P, B, and S can be exceptions to the octet rule. Atoms beyond the 4th period can have an expanded octet because of shared pairs, and H, He, Li and Be will never have an octet. It is great to remember that n is the energy level, and l is the orbital. This is su...

Theo Teske 3B

This is amazing. Thank you so much, it's super helpful for me.

Theo Teske 3B

I think it's also good to make sure you don't study too much; going over the same things over and over will only stress you out and make you less able to perform at your best on the test.

Theo Teske 3B

This is so helpful. I really appreciate you posting this!

Theo Teske 3B

Is there even going to be a curve? It doesn't mention one in the syllabus.

Theo Teske 3B

Are there still UA sessions going on in this course (I saw that the posts in this thread before the most recent one are all from last spring quarter. not this one). For future reference, are there review sessions available before the midterms/exams that people recommend?

Theo Teske 3B

I believe black body radiation helps prove that light acts both as a particle and a wave. If there were no photons with momentum then the blackbody radiation could never reach thermal equilibrium and the same could be said if there was no increase in the intensity of light (or amplitude) then the b...

Theo Teske 3B

Just to clarify, does this mean that we should treat the mass of the molecule throughout the problem as being its mass plus the mass of the nH20?

Theo Teske 3B

Thanks Kate! You're the best for posting these.

Theo Teske 3B

ml in this instance refers to the magnetic quantum number, specifying the orientation in space of an orbital of a given shape (l) and energy (n).

Theo Teske 3B

ml in this instance refers to the magnetic quantum number, specifying the orientation in space of an orbital of a given shape (l) and energy (n).

Theo Teske 3B

If two atoms have an electronegativity difference of between 0.5-1.7 (the numbers vary from source to source), it will be a polar covalent bond. If the electronegativity difference is less than 0.5, the bond can generally be considered nonpolar. Carbon has an EN value of 2.55, while Hydrogen has an...

Theo Teske 3B

Is there anywhere to find a more detailed answer section for the textbook? I know some websites have textbook answers, but I can't find one for this book. I would also love more detailed answers to the textbook questions. If there isn't some resource readily available, maybe Dr Lavelle or one of th...

Theo Teske 3B

I attended a workshop last week and it really helped me recognize whether or not I knew the content, both concepts and multi-step problems. It was brutal but now I know I need to attend more! Where/when was this workshop? I might be interested in attending one myself. Also, who was running the work...

Theo Teske 3B

Remember that the ground state of an element does not imply a full valence shell. As the other commentator pointed out, oxygen only has 8 electrons (with 4 valence electrons). This is why the answer is 1s2 2s2 2p4 rather than 1s2 2s2 2p6. Also notice that 1s2 2s2 2p4 has the same number of electrons...

Theo Teske 3B

I would recommend spacing out study times and reduce procrastination to a minimum. Then on the day or even the day before the exam, do not touch the materials again. Do someone that you enjoy instead! I might have to try this; I always study right up until the exam. I don't really have too much tes...

Theo Teske 3B

A double bond is simply a covalent bond involving two pairs of electrons being shared instead of one pair, which is what is found in a single bond. This has no impact on the chemical formula of a compound.

Theo Teske 3B

To further clarify, molar mass is the mass of one mole of a substance, a mole being a defined amount of particles of said substance (around 6.022 x 10^23). Molar mass is an intensive property, meaning that it is the same regardless of how much of a substance is being considered. This is very useful ...

Theo Teske 3B

Another thing to keep in mind is that exact numbers (such as the conversion rate from meters to yards, for instance) and defined numbers (constants like the speed of light) have an infinite number of significant figures, but they're generally not reported. Not sure if this will come up in class but ...

Theo Teske 3B

An electrical field, which I've more often heard referred to as an electric field, describes the force that acts on and surrounds all charged particles in a space. So, electromagnetic radiation, as it travels through space, has both an oscillating electric field and an oscillating magnetic field com...

Theo Teske 3B

I feel as though I would do significantly better if I was allowed to sit in the lecture hall for class instead of just watching the online recorded portion, are we allowed to do this? I agree and would also prefer to watch a lecture in person rather than watching the recordings that are posted on C...

CHEMISTRY COMMUNITY

Search found 28 matches

Re: energy and frequency

Re: Uncertainty Equation for Big Objects

Re: Key Concept of the Photoelectric Effect

Re: Wavelength

Re: E= hR/n^2

Re: Percent Yield and How to Find it

Re: Quantum Description of Atoms

Re: Tips for Remembering d-State Bonding Elements on Periodic Table?

Re: Helpful chem resource

Re: Final Jitters

Re: Midterm 2 Practice Questions

Re: Midterm Grading

Re: Review Sessions

Re: Particle or wave

Re: molecule • 5H2O

Re: Kate's UA Session Workshops

Re: n, l, ml

Re: n, l, ml

Re: Nonpolar vs Polar covalent

Re: Reading the textbook

Re: Rusty on High School Chem [ENDORSED]

Re: Electron Configuration

Re: Final Jitters

Re: Diagrams and Molecular formulas [ENDORSED]

Re: Molar mass and molecular mass [ENDORSED]

Re: significant figures and trailing zeros

Re: Topic 1A Exercise #3, not sure what an electrical field is

Re: Tips