CHEMISTRY COMMUNITY

Annika Tamaki 1E

A lot of rest and time outdoors!!

Annika Tamaki 1E

I don't think we are allowed to highlight/annotate the equation sheet in any way.

Annika Tamaki 1E

State properties focus on the destination, instead of the path taken. So for enthalpy and other state properties, it doesn't matter what happens in between, only the final and initial values. However, heat is specifically measuring the path taken because amount of heat differs for different pathways...

Annika Tamaki 1E

I'm in the Nikkei Student Union!

Annika Tamaki 1E

Boba will always be my fav!

Annika Tamaki 1E

I take a day off from school work every week. It's super helpful to avoid feeling overwhelmed and too stressed. I usually spend it catching up on sleep and other non-school responsibilities, while spending time with family! Good luck, you've got this!

Annika Tamaki 1E

One thing I remember is that to calculate the overall order of multiple reactants, you add their exponents together. He goes over this towards the end of the lecture on Friday. You can also take a look at the unique average rate for a reaction. Yea Friday's lecture goes over how multiple reactants ...

Annika Tamaki 1E

The final is supposed to be cumulative, with the number of problems per topic equating to the amount of time spent on each topic. Hope this helps!

Annika Tamaki 1E

Although I try to study as often as possible, I usually don't do work on Saturdays, just so I can have a day to relax, catch up on sleep, take care of other responsibilities, and spend time with family. After a rest day, I usually feel refreshed and ready to keep studying. It's super helpful to avoi...

Annika Tamaki 1E

In acidic conditions, you can just add H+ ions to balance the equation. However, in basic conditions, you must use water to balance the hydrogen. You have to add one water for every H+ you need, and then add the same number of OH- to the other side.

Annika Tamaki 1E

With a basic solution, the rule of thumb is to always balance the oxygens with water. Then, to balance the hydrogen, you add one water per H+ that you need. So if you need 2 H+, you will add 2 waters. Then, you'll add OH- to the other side. You should add the same number of OH- as the water you just...

Annika Tamaki 1E

This problem is a little tricky because since Fe2O3 is multiplied by H2O, any coefficient that you add to Fe2O3 will be multiplied by the number of H2O. For example, if you add a 2 in front of Fe2O3, there are now also 2H2O. Hope this helps!

Annika Tamaki 1E

KatarinaReid_3H wrote:I am still confused because I retried it and this is wrong. I may have misinterpreted what you meant.

You would have to change the reactants H2O, not the products H2O. So on the reactants, it should be 6 H2O and 3 H2O on the products.

Annika Tamaki 1E

I'm taking LS7C, Chem 14C, and a nursing anatomy course!

Annika Tamaki 1E

Great. Thanks everyone!

Annika Tamaki 1E

Great work everyone! Hope you all got a chance to rest.

Annika Tamaki 1E

On Friday's lecture, Dr. Lavelle gave the example of the cell diagram:
Cu(s)/Cu2+(aq)//Fe3+(aq), Fe2+(aq)/Pt(s)
Why did he put the electrode on the right side, and does it matter if it's on the right or left side? Thanks in advance!

Annika Tamaki 1E

The final should be cumulative.

Annika Tamaki 1E

In Friday's lecture, he said that in reality the anodes and cathodes can be on either side, but conventionally, they are represented as anode on the left and cathode on the right.

Annika Tamaki 1E

Yes! Be sure to add the amount of degrees Celsius to 273 to get your temperature in Kelvin

Annika Tamaki 1E

Yes, K always means equilibrium constant

Annika Tamaki 1E

He said in his email that this midterm will have more partial credit opportunities than MT 1...

Annika Tamaki 1E

Hello, I am also very nervous but here are some things I'm doing to help myself feel more prepared for the test! 1.) Of course, workin on sapling and tb problems, but also making note of what TYPES of questions there are (how they ask the question). Often times the question itself seems very daunti...

Annika Tamaki 1E

If it helps, I always feel like midterm nerves motivate me to study more! Take advantage of these feelings because you still have a couple days! Best of luck

Annika Tamaki 1E

Lavelle doesn't curve because many people get 100%...

Annika Tamaki 1E

We will find out more information later this week!

Annika Tamaki 1E

Steam has far more energy than liquid water or ice. Therefore, if you put your hand in steam, your hand will absorb more energy, than if it were to touch hot water, causing the severe burn!

Annika Tamaki 1E

I probably don't study as much as I should, but I end up doing about 8 hours a week (on a good week).

Annika Tamaki 1E

I think setting realistic goals for the day would truly be helpful. If you think an assignment would be a lot of work, start immediately and divide the task into small sections before the deadline. Spacing out your learning can really help you feel less stressed. Also, when you're doing work avoid ...

Annika Tamaki 1E

Although it may sound counterintuitive, prioritize sleep, exercise, and good nutrition over studying! When your body is functioning optimally, you can focus better and will be able to absorb and recall information far more efficiently! Stay strong and know that you aren't alone.

Annika Tamaki 1E

It usually takes about a week, but fingers crossed that it'll be sooner!

Annika Tamaki 1E

Hi! For this problem, it’s helpful to know that because Ba(OH)2 is an alkaline earth hydroxide, it is a strong base. As such, we would expect the reaction Ba(OH)2(aq) —> Ba2+(aq) + 2OH-(aq) to go to completion. To start, we can convert the 0.43g Ba(OH)2 to its molar concentration (use molar mass an...

Annika Tamaki 1E

I find it super helpful to just go through the section outlines!

Annika Tamaki 1E

Exactly as above! As far as I know the Ka is small enough compared to the initial concentration that you can disregard x in the denominator. So, I originally did it this way, but since the percent ionized is greater than 5%, you actually have to include the x in the denominator, regardless of the K...

Annika Tamaki 1E

I created an ICE table using the initial concentration of lactic acid. Since you know the Ka value, you can solve for the x values, and find the [H3O+] value. From there, you can solve for pH=-log(H3O+), find pOH with 14= pH+pOH, and finally find the percent ionization with the equation [CH3CH(OH)C...

Annika Tamaki 1E

I created an ICE table using the initial concentration of lactic acid. Since you know the Ka value, you can solve for the x values, and find the [H3O+] value. From there, you can solve for pH=-log(H3O+), find pOH with 14= pH+pOH, and finally find the percent ionization with the equation [CH3CH(OH)CO...

Annika Tamaki 1E

Midterm 1 is Jan 29 :)

Annika Tamaki 1E

A conjugate base of a weak acid will be a strong base.

Annika Tamaki 1E

pH= -log([h3O+]). Therefore, you should always try to solve for the [H3O+] value, in order to find pH. You can also solve for the [OH-], to get the pOH with pOH=-log([OH-]). From there, you can solve for pH by using 14=pH+ pOH. Hope this helps!

Annika Tamaki 1E

Yes, we would assume that it is not a solid or a liquid, but we will almost always be told the state of matter.

Annika Tamaki 1E

If the reaction is exothermic, than increasing the temperature would favor reactants and vice versa.

Annika Tamaki 1E

You are correct! Since the k= [products]/[reactants], a large k value would mean a large product concentration and that the reaction favors products. Therefore, the reaction lies to the right and vice versa.

Annika Tamaki 1E

Very interesting! Thank you for sharing :)

Annika Tamaki 1E

I think the best technique is to just drill problems, as opposed to looking at and reviewing notes. You'll be more engaged with the content. Also, try to do this every night, so that you don't have to cram before the test.

Annika Tamaki 1E

After taking Chem 14a, I realized that I didn't fully take advantage of the extra help that was available--outside of lecture. So this quarter I'm trying my best to attend as many sessions as possible. Me too! I only began to go to them the week before the final and am now regretting not fully util...

Annika Tamaki 1E

It's always helpful to quiz yourself and practice test problems, instead of just reading notes! Also, be sure to do a little every night, like in 30 minute chunks, so that you don't have to cram for the final.

Annika Tamaki 1E

I love Harry Potter so that always brings comfort.

Annika Tamaki 1E

You can use PV=nRT to convert the atm to concentration. PV=nRT can be written as P=nRT/V. n/V=concentration, so P=conc(RT). Then, you can solve for concentration and then plug that value into K=[P]/[R].

Annika Tamaki 1E

If you reverse the reaction, the original reactants are now the product and the original products are now the reactants. If you were to plug those numbers into the Kc equation, you would get the reciprocal of the original reaction Kc. Hope this helps!

Annika Tamaki 1E

K just represents concentration, whereas Kc represents the constant equilibrium concentration.

Annika Tamaki 1E

You have to click the use credit option. It didn't work for me yesterday, but I tried it again today and it went through. So if it doesn't work for you, I'd say wait a day :) hope this helps!

Annika Tamaki 1E

So nice of you to share. Thank you!!

Annika Tamaki 1E

I'm having this issue to, but my connection was fine so I assumed it was CCLE and decided to wait on watching it.

Annika Tamaki 1E

You can plug in all of your assignment grades into this calculator to find your overall grade. https://www.rapidtables.com/calc/grade/ ... lator.html

Annika Tamaki 1E

This was very nice of you to share. Thank you!

Annika Tamaki 1E

What is a terminal atom? Is it just an atom that is not in the center? Thanks!

Annika Tamaki 1E

On Lavelle's website, he has a list of ligand names, so if we are supposed to memorize anything, it is likely his list.

Annika Tamaki 1E

You cannot tell the type of bond just based on the shape, since double and triple bonds are still regarded as one region of electron density. You must draw the lewis dot structure to know. Hope this helps!

Annika Tamaki 1E

He said that both are acceptable, but -o is more common and widely used in chemistry.

Annika Tamaki 1E

Oh okay. Thank you! That makes sense now.

Annika Tamaki 1E

In today's lecture, Lavelle said that you cannot have the same prefix twice in the name of a coordination compound. So when you have di-, tri-, or tetra-, is it the ligand or the hydrate that changes to bis-, tris-, tetrakis-, or pentakis-?

Annika Tamaki 1E

Shapes with more than 6 electron densities definitely exist. However, that is way beyond our class lol

Annika Tamaki 1E

Everyone at some point feels anxious about their grade, but all we can do is try our best!

Annika Tamaki 1E

The 60 degree angle comes from the triangular configuration!

Annika Tamaki 1E

Axial is on the vertical plane, whereas equatorial is on the horizontal plane.

Annika Tamaki 1E

Yes, that's correct! On Lavelle's website, he has a cheat sheet on the rules of sig figs that you might find helpful.

Annika Tamaki 1E

I like to take virtual dance classes!

Annika Tamaki 1E

No, Hydrogen bonding can only be between H and F, O, N.

Annika Tamaki 1E

He was referring to the fact that you must complete Nitrogen's octet, which would give you 8 valence electrons.

Annika Tamaki 1E

Think back to one of the first lectures in this section where he drew the paired arrows for each subshell. For every number following the subshell, like a 4 in 3p4, there are that many atoms. Since there is room for 6 electrons in every p subshell, there will be 3 pairs of electrons. If we look at t...

Annika Tamaki 1E

We have never been given the full equation, so we only need to know the proportionality equation and the relationships between the variables. The equation can also represent just two atoms. Hope this helps!

Annika Tamaki 1E

If the dipole moment equals charge * distance and distance is affected by the number of bonds, then the number of bonds will affect the dipole moment. Since a higher number of bonds results in shorter distance, triple and double bonds will have a lower dipole moment than single bonds. Hope this helps!

Annika Tamaki 1E

There are exceptions for every element that falls at d4 and d9. Silver and copper are in the same group, so you would apply the same the same pattern of filling the d block to d10 and then removing an electron from the s block to make the configuration more stable. You would do this for every elemen...

Annika Tamaki 1E

The values of m can range between -l and +l. For every l value, there are 2l+1 values that m can be. Hope this helps!

Annika Tamaki 1E

Bond lengths are influenced by many factors, such as number of bonds and size of the atom. Double and triple bonds have shorter bond lengths than single bonds. Additionally, larger atoms will have larger bond lengths. If a problem provides the energy of a bond, then we can infer the length of the bo...

Annika Tamaki 1E

The strength of the bond is measured by its dissociation energy, or the energy required to break a bond. Therefore, the value is negative to represent the energy lost by the bond when it breaks.

Annika Tamaki 1E

I printed out Lavelle's formula sheet and have just recorded a bunch of common conversions. It has helped me become more familiar with them conceptionally, and I am more confident converting them for assignments.

Annika Tamaki 1E

Delocalized electrons refer to electrons that are shared between different atoms, which result in the hybrid structures.

Annika Tamaki 1E

The term delocalized electrons refers to the sharing of electrons between different atoms. So, yes, electrons are shared equally.

Annika Tamaki 1E

The minus sign in the formula NO3^- indicates that there is an extra electron. Therefore, he had to add that electron to the total number found from N and the 3 O's.

Annika Tamaki 1E

Non-metals have higher ionization energy than metals. Ionization energy is the amount of energy required to remove an electron. Therefore, it is much more likely for metals, with low ionization energy, to lose an electron than for nonmetals.

Annika Tamaki 1E

I would add a chemistry pun, but the best ones Argon.

Annika Tamaki 1E

Theoretical yield is the amount of the products based on the limiting reactants and the molar ratios. If you calculate how many moles of the products will be produced by the limiting reactant, you can convert that to grams to find the theoretical yield. The actual yield will be given and is based on...

Annika Tamaki 1E

The number of arrows corresponds to the number of electrons. For example, if I had the configuration for Nitrogen, [He] 2s2 2p3, I would only put 3 arrows in the 2p level. I would only draw 3 uncomplemented arrows because it represents a more stable electron. You must fill all of the subshells first...

Annika Tamaki 1E

Atomic orbitals and molecular orbitals can be used interchangeably, so there is no difference.

Annika Tamaki 1E

An atomic orbital is defined as a region of space in which there is a high probability of finding an electron in an atom (s, p, d, f). A subshell is all the atomic orbitals of an atom that have the same l value. Hope this helps!

Annika Tamaki 1E

Does anyone have any tips for remembering which EM spectrum region is Balmer and which on is Lyman? I keep getting mixed up. Thank you!

Annika Tamaki 1E

If you look on his website, there is a list of constants and equations. The mass of the electron is given on this sheet as 9.109383*10^-31 kg.

Annika Tamaki 1E

The intensity of the light refers to the number of photons, and results in no changes to the wavelength or frequency.

Annika Tamaki 1E

In response to the Circular Standing Wave model, is it safe to say that there will be one wave for every spectral line?

Annika Tamaki 1E

Both equations mean the same thing, but c represents speed of light and v represents velocity (which should just be the speed of light).

Annika Tamaki 1E

All masses have wavelike property, but only small objects can be observed to have these wavelike properties. This is because momentum=mass*velocity. If an object has a large mass, it will have a large momentum as well. Since wavelength=h/momentum, mass and wavelength are inversely proportional. So i...

Annika Tamaki 1E

The +- 5 is the uncertainty in velocity. You will have to use the value delta v= 10m/s to solve for delta p, which you'll use to find delta x.
Hope this helps!

Annika Tamaki 1E

I believe that we will be given constants in every question, but I'm not sure about equations.

Annika Tamaki 1E

Reactants and reagents are the same thing, so there is no difference between limiting reactant and limiting reagent.

Annika Tamaki 1E

This is more of a physics concept, so I don't think that we need to know why and how they interact, but just that light is electromagnetic radiation. Electric fields are made from opposing charges, whereas magnetic fields are made from opposing poles. The waves in the field move together creating el...

Annika Tamaki 1E

You are correct. We cannot observe wavelike characteristics from large objects because the wavelength is too small to be measured. Since wavelength is inversely proportional to momentum, and momentum is proportional to mass, wavelength is also inversely proportional to mass. Therefore, the large obj...

Annika Tamaki 1E

This sign means that the variables are proportional to each other. We can also say the variables are proportional to each other if it was written as "E=vh" or "E=v/a" (a is just a random variable that I made up ;)). I hope this helps!

Annika Tamaki 1E

My HS Chem teacher once said that moles are always the starting point for calculations, so it's important to understand how to solve for them. Let's say you are given an amount of 24 grams of Carbon, and you need to solve for the moles. On your periodic table, you will find that the molar mass of Ca...

Annika Tamaki 1E

No questions are stupid lol. Molar mass is the ratio of grams per mole, whereas molecular mass is the mass of a given molecule. Hope this helps :)

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