ASHLEY'S STEP UP WORKSHEETS

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ASHLEY'S STEP UP WORKSHEETS

Postby Chem_Mod » Sun Jun 30, 2019 2:01 pm

Hello everyone! My name is Ashley, and I am one of your UA's this summer. I will be hosting my Step Up sessions on Mondays, where I will be going over each problem step by step. I will mostly be pulling problems from the listed homework assignments, and I will also be posting the answer key online. If you want the step-by-step methods on how to approach the problems, come to the Step Up sessions!!!

Attached is this week's Step Up Worksheet. Hope to see you there!
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Summer Step Up 1.0.docx
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Re: ASHLEY'S STEP UP WORKSHEETS

Postby Chem_Mod » Wed Jul 03, 2019 1:06 pm

Here are the answers for the first worksheet!
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Step Up Worksheet Answers.docx
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Re: ASHLEY'S STEP UP WORKSHEETS

Postby Chem_Mod » Fri Jul 05, 2019 3:01 pm

Hello Everyone! I hope everyone had a great Fourth of July, and are now soon preparing for your midterm next week! Attached is the worksheet that I will be going over in my session on Monday. It includes problems that would be similar to what you may see on your midterm. Happy studies!
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Step Up for Midterm.docx
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Jeril Joseph 1B
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Re: ASHLEY'S STEP UP WORKSHEETS

Postby Jeril Joseph 1B » Sat Jul 06, 2019 12:15 pm

Chem_Mod wrote:Here are the answers for the first worksheet!


I had a question on number 3 on this worksheet. So, I got up to getting 4.74 x10^39 s.^-1 mol. ^-1, but I don't know what to do from there. I attempted using stoichiometry to convert my units, but I don't know what to use to do that. Can someone help????

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Re: ASHLEY'S STEP UP WORKSHEETS

Postby Jeril Joseph 1B » Sat Jul 06, 2019 12:40 pm

Also, for the last question on the worksheet, shouldn't it be 10^15 since you're doing -18 - (-34)???? I got the other part of the answer, but is there an error with the exponent or is it just me?

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Re: ASHLEY'S STEP UP WORKSHEETS

Postby Chem_Mod » Sun Jul 07, 2019 5:19 pm

Yes, you are right that it should be 3.08 x 10^15. My apologies on the typo in the answer key!

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Re: ASHLEY'S STEP UP WORKSHEETS

Postby Chem_Mod » Sun Jul 07, 2019 6:15 pm

Jeril Joseph 1B wrote:
Chem_Mod wrote:Here are the answers for the first worksheet!


I had a question on number 3 on this worksheet. So, I got up to getting 4.74 x10^39 s.^-1 mol. ^-1, but I don't know what to do from there. I attempted using stoichiometry to convert my units, but I don't know what to use to do that. Can someone help????



For number 3, the problem tells you the threshold energy required to remove an electron and we are trying to find the shortest frequency of light required to remove it (thus the minimum amount of energy without having the electron being released with any kinetic energy). We can therefore use E = hv and use the given threshold energy (3.14x10^3 kJ/mol) as E and solve for v.

If you pay attention to the units, it is given in kJ/mol, but we actually want J/photon because we want the amount of energy to remove a single electron from the energy of a single photon. Therefore, using stoichiometry to convert kJ/mol to J/photon, we get:

(3.14*10^3 kJ/mole photons) x (10^3 J/1 kJ) x (1 mole photons/ 6.022*10^23 photon) = 5.21*10^-18 J/photon

Now we can plug in 5.21*10^-18 J/photon into the E = hv equation and solve for v.

Hope this helped!

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Re: ASHLEY'S STEP UP WORKSHEETS

Postby Jeril Joseph 1B » Mon Jul 08, 2019 3:00 pm

This was helpful. Thank you so much!

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Re: ASHLEY'S STEP UP WORKSHEETS

Postby Chem_Mod » Mon Jul 08, 2019 6:36 pm

I have attached the answers to the worksheet, including some step-by-step calculations.
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Step Up for Midterm.docx
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Re: ASHLEY'S STEP UP WORKSHEETS

Postby Chem_Mod » Fri Jul 12, 2019 8:34 pm

Here is the worksheet for my Step Up session this upcoming Monday. Feel free to take a look at it if you get the chance. If not, we will go over the questions step-by-step.
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Summer Step Up 2.0.docx
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Re: ASHLEY'S STEP UP WORKSHEETS

Postby Chem_Mod » Wed Jul 17, 2019 7:28 pm

Answers to the last worksheet
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Step Up Worksheet 2.0 Answers.docx
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Re: ASHLEY'S STEP UP WORKSHEETS

Postby Jeril Joseph 1B » Wed Jul 17, 2019 10:56 pm

Chem_Mod wrote:Answers to the last worksheet

Question: On 2c, wouldn't the answer be CO2 since there is a larger electronegativity difference. Because you said CS2 has more covalent character when the questions asks for a greater ionic character.

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Re: ASHLEY'S STEP UP WORKSHEETS

Postby Chem_Mod » Sat Jul 20, 2019 4:52 pm

Good catch! Yes you are right, CO2 would have more ionic character. C and S have very similar electronegativity, so CS2 would be more covalent.

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Re: ASHLEY'S STEP UP WORKSHEETS

Postby Chem_Mod » Sat Jul 20, 2019 4:53 pm

Step up worksheet for this Monday
Attachments
Step Up Worksheet 3.0.docx
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Re: ASHLEY'S STEP UP WORKSHEETS

Postby Jeril Joseph 1B » Tue Jul 23, 2019 8:18 pm

Chem_Mod wrote:Step up worksheet for this Monday

Question: For 1b, is there supposed to be a charge because I'm having trouble drawing the structure of CH2F as being neutral. Or is the molecule a radical?

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Re: ASHLEY'S STEP UP WORKSHEETS

Postby Chem_Mod » Fri Jul 26, 2019 11:50 am

Answers for this last week. And you always find my one typo! Sorry, 1b was meant to just be CH3F, not CH2F.
Attachments
Step Up Worksheet 3.0.docx
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