CHEM 101L QUESTIONS AND ANSWERS
In the event the fire alarm for Morehead Laboratory sounds, you must evacuate
the building. Assuming the emergency does not interfere with your best route,
you should__________ .
xit the lab and proceed to the stairs nearest the Venable parking lot and Columbia
Street. After exiting on the ground floor you should meet your TA on the far side of the
driveway to the parking lot so that you can be included in a head count of those safely
evacuated, keeping the drive clear for emergency vehicles., exit the lab and proceed to
the stairs nearest the elevator. After exiting on the ground floor you should meet your
TA in front of the sign for Kenan Laboratories just off of South Road so that you can be
included in a head count of those safely evacuated.
When working in the lab, you should always remove your gloves when:
I. Typing on your laptop keyboard
II. Leaving the laboratory
III. Picking up your pen to record observations in the lab notebook
IV. Using the doorknob
V. Using the laboratory phone
VI. Adjusting your hat/hair clip
VII. Scratching your nose
All of these are cases when you should first remove your gloves
The volume marking at the sealed bottom of a buret segment is 38.60 mL, and has
markings for every 0.1 mL. When water is added, the bottom of the meniscus sits
about halfway between the line for 18.3 mL and the next mark up. What volume of
water is contained in the buret segment?
38.60-18.25= 20.35 mL
When calculating the displacement volume of the thermometer, the volume
reading on the buret is 28.47 mL without the thermometer, and 27.82 mL with the
thermometer in place. How many significant figures should be recorded for the
displacement volume of the thermometer?
2
Using the graph provided, for the reaction of 3.50 g of sodium bicarbonate with
300 mL of 0.5 M citric acid, the value of ΔT/mol (°C/mol) would be:
216 °C/mol
The molecular equation for a reaction is: Mg (s) + 2 HCl (aq) →MgCl2 (aq) + H2 (g).
Based on this equation and the observations of the reaction, the spectator ions in
the ionic equation would be:
Cl-
In the Balmer series for hydrogen, what is the initial energy level (ni) for a photon
with a wavelength of 656.3 nm? REMEMBER: h = 6.626 x 10-34 J⋅s; c = 2.998 x 108
m/s; RH = 2.18 x 10-18 J
x=√1/(∆E/RH)-(1/4)
∆E=(1.986×10⁻²⁵/wavelength (m)
3
In the event the fire alarm for Morehead Laboratory sounds, you must evacuate
the building. Assuming the emergency does not interfere with your best route,
you should__________ .
xit the lab and proceed to the stairs nearest the Venable parking lot and Columbia
Street. After exiting on the ground floor you should meet your TA on the far side of the
driveway to the parking lot so that you can be included in a head count of those safely
evacuated, keeping the drive clear for emergency vehicles., exit the lab and proceed to
the stairs nearest the elevator. After exiting on the ground floor you should meet your
TA in front of the sign for Kenan Laboratories just off of South Road so that you can be
included in a head count of those safely evacuated.
When working in the lab, you should always remove your gloves when:
I. Typing on your laptop keyboard
II. Leaving the laboratory
III. Picking up your pen to record observations in the lab notebook
IV. Using the doorknob
V. Using the laboratory phone
VI. Adjusting your hat/hair clip
VII. Scratching your nose
All of these are cases when you should first remove your gloves
The volume marking at the sealed bottom of a buret segment is 38.60 mL, and has
markings for every 0.1 mL. When water is added, the bottom of the meniscus sits
about halfway between the line for 18.3 mL and the next mark up. What volume of
water is contained in the buret segment?
38.60-18.25= 20.35 mL
When calculating the displacement volume of the thermometer, the volume
reading on the buret is 28.47 mL without the thermometer, and 27.82 mL with the
thermometer in place. How many significant figures should be recorded for the
displacement volume of the thermometer?
2
Using the graph provided, for the reaction of 3.50 g of sodium bicarbonate with
300 mL of 0.5 M citric acid, the value of ΔT/mol (°C/mol) would be:
216 °C/mol
The molecular equation for a reaction is: Mg (s) + 2 HCl (aq) →MgCl2 (aq) + H2 (g).
Based on this equation and the observations of the reaction, the spectator ions in
the ionic equation would be:
Cl-
In the Balmer series for hydrogen, what is the initial energy level (ni) for a photon
with a wavelength of 656.3 nm? REMEMBER: h = 6.626 x 10-34 J⋅s; c = 2.998 x 108
m/s; RH = 2.18 x 10-18 J
x=√1/(∆E/RH)-(1/4)
∆E=(1.986×10⁻²⁵/wavelength (m)
3
