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| Q&A
for 20L |
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Prof. Russell, I was wondering about a certain step in the solutions key to the Final Exam Study Questions. In #2, why are the moles of H2PO4 diveded by three? Any response would be greatly appreciated, thanks! -jackie
There are three moles of phosphate in STPP. So when you know the number of moles of H2PO4 there must be one third that many moles of the STPP.
Are there going to be any extra office hours for the final (as there were for the midterm) on monday?
Jennifer will have an extra office hour in 1039 Young at 11am, on Monday and I can be available at noon. -- AAR
I have a question about the 3rd CPR assignment. According to the instructions, we are given 1.0 g of a pure water-soluble weak acid. Is the acid already diluted or is it a solid powder?
It is a solid powder. --AAR
For the midterm, what can we NOT bring as aids?
You may bring a regular calculator (graphing is okay, but not with IR transmission. ) You may not have cell phones on. You may not use printed materials. You may bring any handwritten materials that you want. Please bring an extra pencil or pen.
When will the answers to the Midterm Practice Questions be posted?
Unofrtunately, they did not get posted on Friday as I had hoped. I did not discover this until Saturday. They will be available on monday morning. --AAR
None of the MSDS sites I've searched have anything on Erythrocin B Sodium, or even anything close. Google only turns up one scam pharmacy site and the ucla voh site where the handout itself mentions it.
Try searching for F&DC Red #3. That is how the government has it labeled the compound. --AAR
For the Significant Figures CPR, I only received one review as opposed to three. Do you read my text in this case or is my grade based solely on this one person?
Tyson,
I automatically get a note indicating who has only one review, and I revew them also. I expect to do that this coming weekend. There are about 10 of you who "made" this list.
--AAR
For CPR, the review portion starts Tuesday, but it does not have an end date. Is the assignment end date the same as the review end date? Thank you.
Yes
I am trying to watch the "Use of a Buret" video but the link provided in the report guidelines is not working. Is there another way I can view this video? Thanks.
The correct link is on the lab syllabus. It is the same site as all the other videos. --AARussell
It's 1:16 PM on a Saturday, and the cpr site isn't working properly...meaning "the page cannot be displayed." I'm positive that I'm typing in the right URL, but can you please double check for me so that I don't miss the deadline? Thanks. URL i typed in... http://cpr2.molsci.ucla.edu/cpr/cpr/login.asp
Jennifer,
We needed to upgrade the server this weekend. The upgrade is now complete and the program is available again. I have extended the due date for the calibration training until Tuesday. I am sorry for the inconvenience, the upgrade was essential. -AAR
Are trailing zeros and zeros between two signicant digit considered as place-holders or only zeros before significant figures less than one considered as place-holders? Thank you.
A place-holder means a zero that simply identifies the magnitude of a number. This is never the case when a zero is between significant digits. Whether it is a place-holder when it is trailing significant digits depends on whether there is a decimal presentin this "trail." --AAR
On the Pipet Report Guidelines handout, I was just wondering if the "Practical Considerations" section at the end was meant to be included in the Post-lab report, or if it is as stated, just some practical consideration to do on your own. Mostly just wondering if it was something to directly address in the write-up.
Hello Peter,
Yes, you should address the "practical considerations" in your lab report. --AAR
For the MSDS post-lab, it asks for the chemical name AND the proper or commercial name, but aren't those all the same thing?
there may not be a common name or commercial name for the chmeical you were assignmed. However, this is not always the case. For instance the poper name of acetic acid is ethanoic acid, and it is commercially and commonly called vinegar. -- AAR
