Exam (elaborations)
2024 UNH CHEM 546 PRE-LAB LABS 1-9 QUESTIONS WITH CORRECT ANSWERS
- Course
- Institution
2024 UNH CHEM 546 PRE-LAB LABS 1-9 QUESTIONS WITH CORRECT ANSWERS
[Show more]
Content preview
2024 UNH CHEM 546 PRE-LABLABS 1-9 QUESTIONS WITH
CORRECT ANSWERS
Which of these statements below best describes MISCIBLE liquids? -
CORRECT-ANSWERSTwo liquids that mix homogeneously (1 layer)
Which of these statements below best describes IMMISCIBLE liquids? -
CORRECT-ANSWERSTwo liquids that do NOT mix homogeneously (2 layers)
What kind of technique is Thin-Layer Chromatography (TLC)? - CORRECT-
ANSWERSa fast, qualitative analysis of organic compounds in a mixture
What is the standard stationary phase used in TLC? - CORRECT-
ANSWERSsilica gel
When you "spot" a TLC plate, what are you doing? - CORRECT-ANSWERSyou
are applying a spot of the sample to be analyzed to the bottom of the TLC
plate using a capillary tube
Some compounds separated on a TLC plate are colorless and cannot be seen
by the naked eye. In this case, what common methods are utilized to see the
spot(s)? Choose all correct answers below. - CORRECT-ANSWERSuse a
visualization reagent like iodine to darken the spots on the TLC plate
shine UV light on the plate after solvent has evaporated
What does IR spectroscopy allow us to determine? - CORRECT-ANSWERSThe
types of bonds in a compound
The peaks observed in infrared spectroscopy correspond to: - CORRECT-
ANSWERSThe energy absorbed by a molecule for a specific bond vibration
Which of the following signals in an IR spectrum would confirm the presence
of a carboxylic acid (RCOOH)? - CORRECT-ANSWERSA C=O stretch at ~1700-
1725 cm-1 and an O-H stretch at ~2500-3500 cm-1
A C-H bond will give a peak around 3000 cm-1 on an IR spectrum. The exact
location can give insight on the hybridization of that carbon atom. Sp2
hybridized carbons typically show =C-H peaks: - CORRECT-ANSWERSAbove
3000 cm-1
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Elitaa. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
72042 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now