CHEM 2510 Final Practice Questions
with Guaranteed Pass Solutions 2026
Updated.
What type of information is available in an SDS that is of particular importance to students in
this lab? - Answer * product identification
* toxicity
* handling precautions
*hazards
* physical & chemical properties,
If a student is working with strong acid and splashes some on his/her hand, what should be
done first? - Answer Remove the glove and wash the affected area with a steady stream of
cold water for 10-15 minutes
If a student splashes a very small amount of an organic solvent in his/her face what should be
done first? - Answer wash eyes with eye wash (steady stream of water) for 10- 15 minutes
then notify a labmate/ TF
If a student needs emergency medical attention, what number should be called? - Answer 911
At the end of the lab period, what should be done with excess organic solvent, contaminated
with mineral acid? - Answer Dilute the solvent with water and neutralize with sodium
bicarbonate. Then dispose in the organic liquid waste container.
What is the difference between a chemical hazard and a handling precaution? Give an example
of each. - Answer A chemical hazard includes the properties of a chemical reagent that can be
hazardous/ harmful to the person handling it (or the people around them). Eg. All organic
solvents are flammable.
A handling precaution is what the person can do to minimize the risk of being affected by the
hazard. Eg. no flame when using organic solvents
If a student drops a beaker, what should he/she do? - Answer Carefully clean it up with a
dustpan and broom and dispose of the broken glass in the glass waste container. None of the
waste should be touched with bare hands.
Why should one avoid making acid and base solutions in graduated cylinders? - Answer
Graduated cylinders have thin necks and make it more likely for volatile and foam-releasing
acid-base reactions to be released directly in the face of the student or to even break the
cylinder.
,Give 5 example of appropriate PPE - Answer * Goggles
* Gloves
* Lab Coat that extends to knees
* Long pants that cover legs
* Shoes that cover the entire foot
List three types of clothing that are not permitted in lab. - Answer 1 Shorts/ skirts
2. Open toed Shoes
3. tank top
What should you do if you are too sick to come to lab? - Answer Alert your TA, and don't come
into lab
If you are too sick to come to lab, how long do you have to make up the missed experiment? -
Answer One week, from your assigned lab day
If you cannot come on your assigned lab day for a legitimate reason, when are your assignments
due and how do you hand them in? - Answer Assignments are still due the day of your
assigned lab period, and due online (through ClassesV2)
Name the following piece of equipment - Answer * Buchner Funnel
* Side Arm Flask
* Check Valve
What is the main hazard associated with the use of strongly basic solutions, such as sodium
hydroxide solution or potassium hydroxide solution? - Answer Caustic, burns on contact
How many grams of sodium hydroxide are required to make 100 ml of a 3 M solution? - Answer
12 grams. 0.1 L * 3M = 0.3 mol x 40.00 g/mol = 12 g.
What is the main hazard associated with the use of volatile organic solvents such as 95%
ethanol? - Answer Highly flammable, volatile organic solvents can be harmful air pollutants
In a vacuum filtration, how does one choose between using a Hirsch funnel or a Buchner
funnel? - Answer You'd use the Hirsch funnel for filtering out small amounts. The Hirsch funnel
has a much smaller plate with outward angled walls, which makes it better for small amounts
than the larger plate and vertical walls in the Buchner funnel.
, What happened in Lab 2 - Benzoin Condensation Reaction? - Answer benzaldehyde is self
condensed in the presence of catalyst, thiamine hydrochloride and sodium hydroxide to give
benzoin . The reaction is monitored by TLC and the final product is characterized following
purification
In TLC on silica gel plate, which do you expect to have the lowest Rf value, and which will have
the highest Rf value, in an ideal solvent? (Benzaldehyde, Benzoic Acid, Benzoin) Explain. -
Answer ** Lower polarity compounds have higher Rf values than high polarity
Thus for Rf
Benzaldehyde > Benzoin > Benzoic Acid
For the condensation of benzaldehyde to benzoin: draw a TLC plate with benzaldehyde (lane 1),
benzoin (lane 2) and reaction mixture (lane 3), showing incomplete conversion of starting
material to product. - Answer Lane 1 (Benzaldehyde)
Lane 2 ( Benzoin)
Lane 3 (Product Benzoin)
Benzaldehyde has a higher Rf than Benzoin;
Lane 3, has two spots, one each at the location of the spots from Lane 1 & 2
A student takes a TLC for the above reaction at t= 0 and again at t= 30 min. The TLC plates look
exactly the same. What does this mean and what should the student do next? - Answer It
means the reaction has not progressed, and no formation of product has begun.
Add more thiamine HCL, continue heating, and rerun the TLC
What type of intermolecular interactions do you expect in a sample of benzoin? - Answer
Since benzoin is polar (due to hydroxy group)--> Dipole - Dipole, London Dispersion, Hydrogen
bonding
What type of intermolecular interactions do you expect in a sample of ethanol? - Answer
Ethanol = Polar; Hydrogen Bonding, London dispersion, Dipole-Dipole
What does the phrase "like dissolves like" mean? - Answer Nonpolar compounds dissolve in
Nonpolar compounds; and polar compounds dissolve in polar compounds
with Guaranteed Pass Solutions 2026
Updated.
What type of information is available in an SDS that is of particular importance to students in
this lab? - Answer * product identification
* toxicity
* handling precautions
*hazards
* physical & chemical properties,
If a student is working with strong acid and splashes some on his/her hand, what should be
done first? - Answer Remove the glove and wash the affected area with a steady stream of
cold water for 10-15 minutes
If a student splashes a very small amount of an organic solvent in his/her face what should be
done first? - Answer wash eyes with eye wash (steady stream of water) for 10- 15 minutes
then notify a labmate/ TF
If a student needs emergency medical attention, what number should be called? - Answer 911
At the end of the lab period, what should be done with excess organic solvent, contaminated
with mineral acid? - Answer Dilute the solvent with water and neutralize with sodium
bicarbonate. Then dispose in the organic liquid waste container.
What is the difference between a chemical hazard and a handling precaution? Give an example
of each. - Answer A chemical hazard includes the properties of a chemical reagent that can be
hazardous/ harmful to the person handling it (or the people around them). Eg. All organic
solvents are flammable.
A handling precaution is what the person can do to minimize the risk of being affected by the
hazard. Eg. no flame when using organic solvents
If a student drops a beaker, what should he/she do? - Answer Carefully clean it up with a
dustpan and broom and dispose of the broken glass in the glass waste container. None of the
waste should be touched with bare hands.
Why should one avoid making acid and base solutions in graduated cylinders? - Answer
Graduated cylinders have thin necks and make it more likely for volatile and foam-releasing
acid-base reactions to be released directly in the face of the student or to even break the
cylinder.
,Give 5 example of appropriate PPE - Answer * Goggles
* Gloves
* Lab Coat that extends to knees
* Long pants that cover legs
* Shoes that cover the entire foot
List three types of clothing that are not permitted in lab. - Answer 1 Shorts/ skirts
2. Open toed Shoes
3. tank top
What should you do if you are too sick to come to lab? - Answer Alert your TA, and don't come
into lab
If you are too sick to come to lab, how long do you have to make up the missed experiment? -
Answer One week, from your assigned lab day
If you cannot come on your assigned lab day for a legitimate reason, when are your assignments
due and how do you hand them in? - Answer Assignments are still due the day of your
assigned lab period, and due online (through ClassesV2)
Name the following piece of equipment - Answer * Buchner Funnel
* Side Arm Flask
* Check Valve
What is the main hazard associated with the use of strongly basic solutions, such as sodium
hydroxide solution or potassium hydroxide solution? - Answer Caustic, burns on contact
How many grams of sodium hydroxide are required to make 100 ml of a 3 M solution? - Answer
12 grams. 0.1 L * 3M = 0.3 mol x 40.00 g/mol = 12 g.
What is the main hazard associated with the use of volatile organic solvents such as 95%
ethanol? - Answer Highly flammable, volatile organic solvents can be harmful air pollutants
In a vacuum filtration, how does one choose between using a Hirsch funnel or a Buchner
funnel? - Answer You'd use the Hirsch funnel for filtering out small amounts. The Hirsch funnel
has a much smaller plate with outward angled walls, which makes it better for small amounts
than the larger plate and vertical walls in the Buchner funnel.
, What happened in Lab 2 - Benzoin Condensation Reaction? - Answer benzaldehyde is self
condensed in the presence of catalyst, thiamine hydrochloride and sodium hydroxide to give
benzoin . The reaction is monitored by TLC and the final product is characterized following
purification
In TLC on silica gel plate, which do you expect to have the lowest Rf value, and which will have
the highest Rf value, in an ideal solvent? (Benzaldehyde, Benzoic Acid, Benzoin) Explain. -
Answer ** Lower polarity compounds have higher Rf values than high polarity
Thus for Rf
Benzaldehyde > Benzoin > Benzoic Acid
For the condensation of benzaldehyde to benzoin: draw a TLC plate with benzaldehyde (lane 1),
benzoin (lane 2) and reaction mixture (lane 3), showing incomplete conversion of starting
material to product. - Answer Lane 1 (Benzaldehyde)
Lane 2 ( Benzoin)
Lane 3 (Product Benzoin)
Benzaldehyde has a higher Rf than Benzoin;
Lane 3, has two spots, one each at the location of the spots from Lane 1 & 2
A student takes a TLC for the above reaction at t= 0 and again at t= 30 min. The TLC plates look
exactly the same. What does this mean and what should the student do next? - Answer It
means the reaction has not progressed, and no formation of product has begun.
Add more thiamine HCL, continue heating, and rerun the TLC
What type of intermolecular interactions do you expect in a sample of benzoin? - Answer
Since benzoin is polar (due to hydroxy group)--> Dipole - Dipole, London Dispersion, Hydrogen
bonding
What type of intermolecular interactions do you expect in a sample of ethanol? - Answer
Ethanol = Polar; Hydrogen Bonding, London dispersion, Dipole-Dipole
What does the phrase "like dissolves like" mean? - Answer Nonpolar compounds dissolve in
Nonpolar compounds; and polar compounds dissolve in polar compounds
