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DINO NUGGETS Review Session! Download Problems HERE  [ENDORSED]

Posted: Mon Oct 28, 2019 6:19 pm
by Chem_Mod
The title is called "Dino Nuggets" so that you can search "Dino Nuggets" and easily find this post!

This is your favorite UA, Lyndon Bui, and here are many practice problems for your midterm. The questions are modeled after previous test and exam questions, but it may not have everything you need to know. This covers only material for the midterm.


Please complete these problems before my review session. My review session this quarter (Fall19) will be Friday, Nov 1, from 5-8pm in Moore 100. I will go over each problem in detail during my review session. The answers, but not full solutions or work, will be posted here at this post after the review session. Any errors in the test will be posted below as well.

Printed copies will NOT be provided at the review session.

This quarter, the review session will feature not just me, but three other UA's! What fun!

Link to Download Problems:
PracticeMidtermFall19_20.pdf
(170.58 KiB) Downloaded 1965 times
Mini Dino Nuggets.pdf
(126.96 KiB) Downloaded 838 times
*Mini Dino Nuggets contains supplemental questions that cover material that was not on the original problem set.

***This is not indicative of the structure, length, or format of the actual midterm. Treat these as extra practice problems. ***

Errors: 13 c) Error found - Please change "throws" to "yeets" (Error caught by Matt Tran)

Link for Answers:
Dino_Nuggets_Answer.pdf
(132.99 KiB) Downloaded 1097 times
Mini Dino Nuggets Answers.pdf
(189.28 KiB) Downloaded 603 times


Happy Studying and Good Luck!
-Lyndon Bui, UA

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Wed Oct 30, 2019 9:59 am
by Daniel Yu 1E
Where can I find the review problems? Also, how do I download the problems?

Chem Mod: Please simply scroll up and read the post! Everything you've asked is there.

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Thu Oct 31, 2019 1:52 pm
by melinak1
I have class until 5:50 on Friday. Is it still fine if I come to the review session 6-8? What will I miss?

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Thu Oct 31, 2019 2:50 pm
by Jasmine Fendi 1D
Do you think that the practice problems on the dino nuggets worksheet are about the same difficulty as the problems that would be on the midterm?

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Thu Oct 31, 2019 6:19 pm
by Micah3J
If I am unable to make the review session tomorrow night but still work out the problems on my own, will the answers be posted on here so I can check my work?

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Thu Oct 31, 2019 9:32 pm
by 205150314
Micah3J wrote:If I am unable to make the review session tomorrow night but still work out the problems on my own, will the answers be posted on here so I can check my work?

Yea it says it right there that the answers will be posted after the review session

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Fri Nov 01, 2019 10:36 am
by sbottomley3a
How will the difficulty of these problems compare to the difficulty of the midterm?

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Fri Nov 01, 2019 5:44 pm
by Malik Oda 1F
Can you please post the work along with the the answers because it was hard to see all the work from the back of the lecture hall

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Fri Nov 01, 2019 8:26 pm
by Janet Nguy 2C
Does anyone know if the midterm will include our most recent topics like Lewis Acids/Bases, Dipole moments, etc.? Or is the cutoff for drawing lewis structures?

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Fri Nov 01, 2019 10:59 pm
by Joanne Kang 3I
I believe Dr. Lavelle said that he would not include the last slide he went over in lecture, which was "Interactions Between Ions & Molecules". Other than that I think everything else can possibly be on the test.

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Sat Nov 02, 2019 11:50 am
by kpang_4H
sbottomley3a wrote:How will the difficulty of these problems compare to the difficulty of the midterm?


At the review session, he said the problems just as hard or harder than midterm questions ideally.

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Sat Nov 02, 2019 11:53 am
by 904914037
I know it says answers will be posted after the review session but does anyone know when exactly they might be posted?

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Sat Nov 02, 2019 5:44 pm
by Chem_Mod
904914037 wrote:I know it says answers will be posted after the review session but does anyone know when exactly they might be posted?


Now:) Thanks for the reminder

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Sat Nov 02, 2019 6:08 pm
by Elizabeth Harty 1A
Can someone explain how to do #5 from this problem set?

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Sat Nov 02, 2019 9:14 pm
by Ada Chung 1C
Will the mini dino nuggets answer key be posted as well?

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Sat Nov 02, 2019 11:31 pm
by ayushibanerjee06
Ada Chung 1C wrote:Will the mini dino nuggets answer key be posted as well?

Will they be posted? pls help us out

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Sun Nov 03, 2019 10:18 am
by Bita Ghanei 1F
Ada Chung 1C wrote:Will the mini dino nuggets answer key be posted as well?


Whoever posts the answers, could you please include the lewis structure drawings for 2A with the dipole moments included?
Does anyone know when to draw the dipole moments and which atoms to put them on?

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Sun Nov 03, 2019 2:41 pm
by JOtomo1F
ayushibanerjee06 wrote:
Ada Chung 1C wrote:Will the mini dino nuggets answer key be posted as well?

Will they be posted? pls help us out



Hello! Also just wondering if the mini dino nuggets answer key will be posted anytime soon. Thanks!

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Sun Nov 03, 2019 9:20 pm
by 904914037
Can someone please explain how to solve question 2 from Dino Nuggets? Conceptually, I understand how to solve this type of problem but my numbers keep coming out different so I must be doing something wrong. Thank you!

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Sun Nov 03, 2019 10:39 pm
by 205150314
904914037 wrote:Can someone please explain how to solve question 2 from Dino Nuggets? Conceptually, I understand how to solve this type of problem but my numbers keep coming out different so I must be doing something wrong. Thank you!


I'm having the same problem, if you found the answer could you please let me know

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Sun Nov 03, 2019 11:10 pm
by Chem_Mod
ayushibanerjee06 wrote:
Ada Chung 1C wrote:Will the mini dino nuggets answer key be posted as well?

Will they be posted? pls help us out

Posted :) Apologies for the wait.

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Mon Nov 04, 2019 11:17 am
by Naren_Ramesh_4F
I just wanted to thank the TA who made this because I found this to be an awesome resource for studying. Thank you so much!

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Mon Nov 04, 2019 1:58 pm
by ayushibanerjee06
For 2a in Mini Dino Nuggets, do you need to draw partial positives on the hydrogens?

dino nuggets #1

Posted: Tue Nov 05, 2019 12:19 pm
by Fdonovan 3D
Isopropyl alcohol, used in rubbing alcohol, is a compound containing only C, H, and O. What is the empirical formula of isopropyl alcohol if you find that 0.255 g of the compound gives 0.561 g of CO2 and 0.306 g of H2O when burned completely in excess oxygen?

Can someone please help get started on this problem?? Not sure why I’m having so much trouble but I can’t seem to figure out how to isolate O2 and C from CO2 and the same with H2O! Please help

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Tue Nov 05, 2019 3:00 pm
by zfinn
for dino nuggets #4 why is the answer 2 sig figs and not 3? is it because 250 mL has only 2 sig figs? i'm a bit confused if that's the reason or if it's something else - if someone could clarify that would be great! thanks so much

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Tue Nov 05, 2019 6:10 pm
by 205150314
For Dino Nuggets 6a, what equation do we need to use ? ive been trying to use different one (because theres a lot for E) and that molar mass is messing me up.

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Tue Nov 05, 2019 6:21 pm
by Hailey Kim 4G
zfinn wrote:for dino nuggets #4 why is the answer 2 sig figs and not 3? is it because 250 mL has only 2 sig figs? i'm a bit confused if that's the reason or if it's something else - if someone could clarify that would be great! thanks so much


Yes, for #4, the answer only has 2 sig figs because 250 mL has only 2 sig figs. You take the least number of sig figs that are given in the question.

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Tue Nov 05, 2019 6:50 pm
by Hannah_1G
In the answer key for the mini dino nuggets, the dipole moments in question 2a are going towards the negative partial charge when in the textbook it says to go towards the positive charge. What would be correct?

Re: dino nuggets #1

Posted: Tue Nov 05, 2019 8:17 pm
by Jamie Lee 1F
Fdonovan 3D wrote:Isopropyl alcohol, used in rubbing alcohol, is a compound containing only C, H, and O. What is the empirical formula of isopropyl alcohol if you find that 0.255 g of the compound gives 0.561 g of CO2 and 0.306 g of H2O when burned completely in excess oxygen?

Can someone please help get started on this problem?? Not sure why I’m having so much trouble but I can’t seem to figure out how to isolate O2 and C from CO2 and the same with H2O! Please help


Hi! You would have to use the molar ratio to find how much Carbon is in CO2 in grams, and do the same with H in H2O. Once you find how much Carbon and Oxygen you have, you would add those quantities and subtract it from the total given mass of isopropyl alcohol to find how much Oxygen you have in the sample. Hope this helps!

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Tue Nov 05, 2019 8:22 pm
by Jamie Lee 1F
Elizabeth Harty 3A wrote:Can someone explain how to do #5 from this problem set?


First, you want to find your initial molarity since it isn't given to you. You would use the first set of information to do so. You would have one flask with 5.00 grams of KMnO4 (which you would convert to moles). To find the molarity of this solution you would use M=n/v. This is your initial molarity that you would plug into M1V1=M2V2, as well as the other needed values. Solve to find your final molarity, or M2! Hope that made some sense.

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Tue Nov 05, 2019 8:28 pm
by Jamie Lee 1F
205150314 wrote:For Dino Nuggets 6a, what equation do we need to use ? ive been trying to use different one (because theres a lot for E) and that molar mass is messing me up.


I used de Broglie's since light isn't involved. Also, make sure you convert the molar mass to mass using Avogadro's... that also might be messing you up if you haven't done that already.

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Tue Nov 05, 2019 8:48 pm
by zfinn
Hi! a few more questions on the dino nuggets review - can anyone explain the reason behind the answers to 9.e, 9.f, or 9.h? also 9.j? Thanks so much in advance!!

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Tue Nov 05, 2019 9:11 pm
by Jamie Lee 1F
Could someone please explain 8b please? I used the photoelectric effect equation relating kinetic energy, energy of the photon, and the work function, but for some reason I'm not getting the correct answer.

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Tue Nov 05, 2019 9:45 pm
by 904914037
205150314 wrote:
904914037 wrote:Can someone please explain how to solve question 2 from Dino Nuggets? Conceptually, I understand how to solve this type of problem but my numbers keep coming out different so I must be doing something wrong. Thank you!


I'm having the same problem, if you found the answer could you please let me know


I found that if you are given the molar mass of the compound and are asked to find only the molecular formula, you can use the percentages given to convert directly into the amount of grams present for each element, which can then be converted to the moles of each element present which should ultimately be your final answer!

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Tue Nov 05, 2019 9:53 pm
by Micah3J
Can someone explain to me the concepts behind 10a? I am confused on why it is Aluminum. Thanks

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Tue Nov 05, 2019 10:13 pm
by Micah3J
Jamie Lee 1D wrote:Could someone please explain 8b please? I used the photoelectric effect equation relating kinetic energy, energy of the photon, and the work function, but for some reason I'm not getting the correct answer.


What answer did you get? I'm having the same trouble and wondering if maybe we made the same mistake.

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Tue Nov 05, 2019 10:16 pm
by Jamie Lee 1F
Micah3J wrote:Can someone explain to me the concepts behind 10a? I am confused on why it is Aluminum. Thanks


Aluminum is larger than Silicon because the effective nuclear charge is stronger in Silicon, which means that the electrons are pulled more strongly towards the nucleus mostly because there are more of them (or 1 more in this case). Basically, the more electrons there are, the greater the force of attraction towards the nucleus.
Hopefully this helps!

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Tue Nov 05, 2019 10:18 pm
by Jamie Lee 1F
Micah3J wrote:
Jamie Lee 1D wrote:Could someone please explain 8b please? I used the photoelectric effect equation relating kinetic energy, energy of the photon, and the work function, but for some reason I'm not getting the correct answer.


What answer did you get? I'm having the same trouble and wondering if maybe we made the same mistake.


I got 3.77 x 10^14 Hz

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Wed Nov 06, 2019 4:58 am
by AGaeta_2C
Hannah_4G wrote:In the answer key for the mini dino nuggets, the dipole moments in question 2a are going towards the negative partial charge when in the textbook it says to go towards the positive charge. What would be correct?

On page 96 of the textbook it shows two. different conventions for representing the dipole. The first is the original convention, in which the arrow points toward the negative partial charge. The second is the modern convention, in which the arrow points toward the negative partial charge. The text uses the modern convention whereas the answer key uses the original convention. I'd say the original convention is easier to convey on paper so that's what I'm going to be using on the exam. Hope this helped!

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Wed Nov 06, 2019 9:30 am
by lauraxie2e
For 6D I am still unclear on what it means by wave like properties, could someone explain that to me?

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Wed Nov 06, 2019 10:33 am
by ayushibanerjee06
For 6b., I am confused about why GarBreadium has the longer deBroglie wavelength. Shouldn't it be He because it weighs more?

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Wed Nov 06, 2019 10:46 am
by curry 1E
for mini dino nuggets 3a and 3b can someone please explain the difference between polarizing power and most polarizable?

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Wed Nov 06, 2019 10:54 am
by ayushibanerjee06
Jamie Lee 1D wrote:Could someone please explain 8b please? I used the photoelectric effect equation relating kinetic energy, energy of the photon, and the work function, but for some reason I'm not getting the correct answer.


i think they used the wrong mass of an electron because when i went to the review session they used 9.11*10^-11 kg instead of 9.11*10^-31 kg. when you use 9.11*10^-11 kg you get 6.78*10^14 Hz. when i use 9.11*10^-31 kg i got 3.77*10^33 Hz.

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Wed Nov 06, 2019 12:50 pm
by 205150314
ayushibanerjee06 wrote:For 6b., I am confused about why GarBreadium has the longer deBroglie wavelength. Shouldn't it be He because it weighs more?


GarBreadium weighs less so it'll make the denominator smaller compared to the denominator of He so the outcome (length) will be larger than if you were to divide by a larger denominator like He. That is why He has the smaller wavelength

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Wed Nov 06, 2019 2:08 pm
by 205150314
Could someone help me on 8B?

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Wed Nov 06, 2019 2:38 pm
by 205150314
ayushibanerjee06 wrote:
Jamie Lee 1D wrote:Could someone please explain 8b please? I used the photoelectric effect equation relating kinetic energy, energy of the photon, and the work function, but for some reason I'm not getting the correct answer.


i think they used the wrong mass of an electron because when i went to the review session they used 9.11*10^-11 kg instead of 9.11*10^-31 kg. when you use 9.11*10^-11 kg you get 6.78*10^14 Hz. when i use 9.11*10^-31 kg i got 3.77*10^33 Hz.


Thank you!

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Wed Nov 06, 2019 3:00 pm
by 205150314
205150314 wrote:
ayushibanerjee06 wrote:
Jamie Lee 1D wrote:Could someone please explain 8b please? I used the photoelectric effect equation relating kinetic energy, energy of the photon, and the work function, but for some reason I'm not getting the correct answer.


i think they used the wrong mass of an electron because when i went to the review session they used 9.11*10^-11 kg instead of 9.11*10^-31 kg. when you use 9.11*10^-11 kg you get 6.78*10^14 Hz. when i use 9.11*10^-31 kg i got 3.77*10^33 Hz.


Thank you!

SO idk how but ive used both 9.11*10^-11 and -31 and still recieve the exact same answer for both masses how is that possible ?

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Wed Nov 06, 2019 3:12 pm
by AGaeta_2C
curry 1E wrote:for mini dino nuggets 3a and 3b can someone please explain the difference between polarizing power and most polarizable?

Polarizing power is used when referring to cations, which give up an electron. Polarizability refers to anions, which gain an electron. These terms both point out the covalent character of some ionic bonds. Polarizing power is the ability of a cation to pull electrons (smaller, more positive cations pull more strongly). Polarizability is the willingness the anion has to have its electron pulled (larger anions hold less strongly to their outer electrons).

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Wed Nov 06, 2019 3:18 pm
by Jared Khoo 1G
ayushibanerjee06 wrote:For 6b., I am confused about why GarBreadium has the longer deBroglie wavelength. Shouldn't it be He because it weighs more?

As mass is on the denominator for deBroglie wavelength calculations, a lower mass atom will have a longer wavelength as it is inversely proportional.

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Wed Nov 06, 2019 3:25 pm
by Micah3J
What is the limiting reagent for #3? Thanks, i just want to be sure I'm doing it right

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Wed Nov 06, 2019 4:21 pm
by VioletKo3F
Does anyone know the answer to 11a?

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Wed Nov 06, 2019 4:54 pm
by 205150314
Does anyone know what to do for 13a?

Re: DINO NUGGETS Review Session! Download Problems HERE

Posted: Wed Nov 06, 2019 5:00 pm
by Micah3J
Jamie Lee 1D wrote:
205150314 wrote:For Dino Nuggets 6a, what equation do we need to use ? ive been trying to use different one (because theres a lot for E) and that molar mass is messing me up.


I used de Broglie's since light isn't involved. Also, make sure you convert the molar mass to mass using Avogadro's... that also might be messing you up if you haven't done that already.



How do you convert the molar mass to mass? I'm having trouble using Avogadro's number