CHM151LL Lab 10 – Labster Virtual Lab – Ma er and Phase Changes of Solu ons
Name:
Grant Welch
Sec on Number:
13106
Ma er and Phase Changes Virtual Lab
Ques ons to answer during the lab:
1. A er telepor ng to your friend’s small town in the highlands, what do you nd she needs your
help with? (2 pts)
a. She needed help increasing the purity level of the town's ethanol so that they can use it
for fuel.
2. What occurs in a dis lla on? (2 pts)
a. During a dis lla on, the various elements of a homogeneous are mixed separately. The
process involves hea ng a liquid un l it vaporizes, then cooling and condensing the
vapor and collec ng the resul ng liquid.
3. Ethanol has a boiling point of 78C̊ while water has a boiling point of 100C̊. Which substance will
be collected rst in the collec ng ask? Why? (3 pts)
a. The ethanol will be collected rst because dis lla on relies on the di erences in boiling
points. Ethanol has lower boiling components so iy will preferen ally vaporize rst.
4. The hot vapor coming from the dis lling ask is cooled by cold water circula ng in the
condenser. Where does the cool water enter? Why? (3 pts)
a. The water enters at the bo om part of the condenser and exits at the top part. As the
hot vapor enters the inner chamber of the condenser, it’s cooled down by the cold
surface, condenses, and passes down the condenser into the collec ng ask. This is to
prevent the ho est vapor from contac ng the coldest water, avoiding thermal shock to
glassware.
5. What is a hea ng curve? (2 pts)
a. A hea ng curve is a plot that shows how the temperature of a substance changes as
heat is added at a constant rate.
Ques ons 6 & 7 pertain to the hea ng curve for water, below.
ft ti tt
titi tifitititttiti titi ti tt tifiti fltiti ti fl ti ti tt ti tiff fl fiti fi ti
, Heat added →
6. Iden fy and de ne the plateau regions ‘b’ and ‘d.’ (4 pts)
a. The plateau regions 'b' and 'd' on a hea ng curve represent phase changes.The ‘b,”
represents the ice is mel ng and the ‘d,’ represents the water is evapora ng.
7. Which requires more energy, ge ng solid ice to its mel ng point, or ge ng liquid water to its
boiling point? Use the hea ng curve diagram to support your answer. (4 pts)
a. It requires more heat to evaporate water than it does for the amount of energy needed
to melt ice. The diagram shows this because the slope in the ice segment is steeper than
the water segment.
8. Once you complete this simula on, you will be shown a screen to verify 100% comple on and
your score. Exit and go to your Grades tab on the le -hand menu and take a screenshot that
shows your score on this lab simula on as well as your name and sec on. Paste the screenshot
below. Remember, you must earn an 80% score on the lab simula on to earn credit. If you do
not achieve an 80% on your rst a empt, redo the lab simula on as needed to earn the 80%.
Once you receive at least an 80% on the lab simula on, you will earn full credit for this
screenshot. (10 pts)
Follow-up Ques ons
1. Explain why there is no temperature change during phase change segments on a hea ng curve.
Make sure to include the concept of intermolecular forces. (6 pts)- The energy required in a
ti fi ti ti ti fi tittittti ti tift ti ti ti ti ttiti titi
Name:
Grant Welch
Sec on Number:
13106
Ma er and Phase Changes Virtual Lab
Ques ons to answer during the lab:
1. A er telepor ng to your friend’s small town in the highlands, what do you nd she needs your
help with? (2 pts)
a. She needed help increasing the purity level of the town's ethanol so that they can use it
for fuel.
2. What occurs in a dis lla on? (2 pts)
a. During a dis lla on, the various elements of a homogeneous are mixed separately. The
process involves hea ng a liquid un l it vaporizes, then cooling and condensing the
vapor and collec ng the resul ng liquid.
3. Ethanol has a boiling point of 78C̊ while water has a boiling point of 100C̊. Which substance will
be collected rst in the collec ng ask? Why? (3 pts)
a. The ethanol will be collected rst because dis lla on relies on the di erences in boiling
points. Ethanol has lower boiling components so iy will preferen ally vaporize rst.
4. The hot vapor coming from the dis lling ask is cooled by cold water circula ng in the
condenser. Where does the cool water enter? Why? (3 pts)
a. The water enters at the bo om part of the condenser and exits at the top part. As the
hot vapor enters the inner chamber of the condenser, it’s cooled down by the cold
surface, condenses, and passes down the condenser into the collec ng ask. This is to
prevent the ho est vapor from contac ng the coldest water, avoiding thermal shock to
glassware.
5. What is a hea ng curve? (2 pts)
a. A hea ng curve is a plot that shows how the temperature of a substance changes as
heat is added at a constant rate.
Ques ons 6 & 7 pertain to the hea ng curve for water, below.
ft ti tt
titi tifitititttiti titi ti tt tifiti fltiti ti fl ti ti tt ti tiff fl fiti fi ti
, Heat added →
6. Iden fy and de ne the plateau regions ‘b’ and ‘d.’ (4 pts)
a. The plateau regions 'b' and 'd' on a hea ng curve represent phase changes.The ‘b,”
represents the ice is mel ng and the ‘d,’ represents the water is evapora ng.
7. Which requires more energy, ge ng solid ice to its mel ng point, or ge ng liquid water to its
boiling point? Use the hea ng curve diagram to support your answer. (4 pts)
a. It requires more heat to evaporate water than it does for the amount of energy needed
to melt ice. The diagram shows this because the slope in the ice segment is steeper than
the water segment.
8. Once you complete this simula on, you will be shown a screen to verify 100% comple on and
your score. Exit and go to your Grades tab on the le -hand menu and take a screenshot that
shows your score on this lab simula on as well as your name and sec on. Paste the screenshot
below. Remember, you must earn an 80% score on the lab simula on to earn credit. If you do
not achieve an 80% on your rst a empt, redo the lab simula on as needed to earn the 80%.
Once you receive at least an 80% on the lab simula on, you will earn full credit for this
screenshot. (10 pts)
Follow-up Ques ons
1. Explain why there is no temperature change during phase change segments on a hea ng curve.
Make sure to include the concept of intermolecular forces. (6 pts)- The energy required in a
ti fi ti ti ti fi tittittti ti tift ti ti ti ti ttiti titi
