CHM101 Lab Final Exam (NEW 2025/ 2026
Update) Introduction to General, Organic,
and Biochemistry Questions & Answers
Grade A 100% Correct (Verified Solutions)-
GCU
When should goggles be worn in lab? - correct answer The whole time you are in lab
You are taking an evening laboratory session and want to bring a snack to help you
make it though the evening. When should you be allowed to have food at the bench
top in the lab?
a. If the experimental work is over and cleaned up
b. At the beginning because it is dinner time and being a student is exhausting.
c. Only if the food remains in the students backpack while at the bench top.
d. Never.
e. Never, unless you have a tendency to become hypoglycemic, then you are allowed
to eat at the bench to prevent health issues. - correct answer d. Never
Accuracy - correct answer A measure of how close a measurement is to the true value
of the quantity measured.
Precision - correct answer A measure of how close a series of measurements are to
one another.
Systematic error arises from a flaw in the equipment or in the experimental design.
This type of error can be detected and corrected. It leads to predictable results.
,CHM101 Lab Final Exam (NEW 2025/ 2026
Update) Introduction to General, Organic,
and Biochemistry Questions & Answers
Grade A 100% Correct (Verified Solutions)-
GCU
Provide several examples. - correct answer - a scale that is improperly calibrated and
always reads 2.3 grams heavier than the object actually is
- a stretched out measuring tape that always reads values lower than the true value.
Random error arises from uncontrolled, often uncontrollable, variables in an
experiment which has equal chance of being positive and negative. This type of error
cannot be detected or corrected for. It leads to unpredictable results. Results will
likely cluster around true value. Provide several examples. - correct answer - wind
speed might speed up or slow down at unpredictable times
- any measurement between 2 markings because different people will read the
measurement differently
EXP 1: Why does ice float in water? - correct answer Ice is less dense than water
because the negatively charged oxygen atoms repel one another due to Hydrogen
bonding. After 4 C (40 F), water begins losing density.
EXP 2: You measure NaOH by difference using an analytical balance. The initial mass
of the NaOH bottle is 5.042g. After removing the NaOH, the bottle mass is 4.812g.
What is the mass of the NaOH you are using? (use correct sig figs) - correct answer
0.230 g
, CHM101 Lab Final Exam (NEW 2025/ 2026
Update) Introduction to General, Organic,
and Biochemistry Questions & Answers
Grade A 100% Correct (Verified Solutions)-
GCU
Mass is measured to _____ significant figs - correct answer 4
Volume is measured to _____ significant figures - correct answer 3
Density equation - correct answer mass/volume
Find the density of liquid CO2. Remember that 1 mL=1 cm^3.
Mass - 55.05g, volume - 10mL - correct answer 55.05g/10mL = 5.505 g/mL
Find the density of Dry Ice (solid CO2). Determine whether the solids will sink of float
when put into liquid CO2. Remember that 1 mL = 1 cm^3.
Mass - 15.62g, 10cm^3 - correct answer 15.62g/10cm^3 = 1.562g/cm^3
Find the density of ice. Determine whether the solids will sink or float when put into
liquid CO2. Remember that 1 mL = 1 cm^3.
Mass - 9.34g, 10cm^3 - correct answer 9.34g/10cm^3 = 0.934g/cm^3
Mean equation - correct answer add up all the data and divide by # of data points
Update) Introduction to General, Organic,
and Biochemistry Questions & Answers
Grade A 100% Correct (Verified Solutions)-
GCU
When should goggles be worn in lab? - correct answer The whole time you are in lab
You are taking an evening laboratory session and want to bring a snack to help you
make it though the evening. When should you be allowed to have food at the bench
top in the lab?
a. If the experimental work is over and cleaned up
b. At the beginning because it is dinner time and being a student is exhausting.
c. Only if the food remains in the students backpack while at the bench top.
d. Never.
e. Never, unless you have a tendency to become hypoglycemic, then you are allowed
to eat at the bench to prevent health issues. - correct answer d. Never
Accuracy - correct answer A measure of how close a measurement is to the true value
of the quantity measured.
Precision - correct answer A measure of how close a series of measurements are to
one another.
Systematic error arises from a flaw in the equipment or in the experimental design.
This type of error can be detected and corrected. It leads to predictable results.
,CHM101 Lab Final Exam (NEW 2025/ 2026
Update) Introduction to General, Organic,
and Biochemistry Questions & Answers
Grade A 100% Correct (Verified Solutions)-
GCU
Provide several examples. - correct answer - a scale that is improperly calibrated and
always reads 2.3 grams heavier than the object actually is
- a stretched out measuring tape that always reads values lower than the true value.
Random error arises from uncontrolled, often uncontrollable, variables in an
experiment which has equal chance of being positive and negative. This type of error
cannot be detected or corrected for. It leads to unpredictable results. Results will
likely cluster around true value. Provide several examples. - correct answer - wind
speed might speed up or slow down at unpredictable times
- any measurement between 2 markings because different people will read the
measurement differently
EXP 1: Why does ice float in water? - correct answer Ice is less dense than water
because the negatively charged oxygen atoms repel one another due to Hydrogen
bonding. After 4 C (40 F), water begins losing density.
EXP 2: You measure NaOH by difference using an analytical balance. The initial mass
of the NaOH bottle is 5.042g. After removing the NaOH, the bottle mass is 4.812g.
What is the mass of the NaOH you are using? (use correct sig figs) - correct answer
0.230 g
, CHM101 Lab Final Exam (NEW 2025/ 2026
Update) Introduction to General, Organic,
and Biochemistry Questions & Answers
Grade A 100% Correct (Verified Solutions)-
GCU
Mass is measured to _____ significant figs - correct answer 4
Volume is measured to _____ significant figures - correct answer 3
Density equation - correct answer mass/volume
Find the density of liquid CO2. Remember that 1 mL=1 cm^3.
Mass - 55.05g, volume - 10mL - correct answer 55.05g/10mL = 5.505 g/mL
Find the density of Dry Ice (solid CO2). Determine whether the solids will sink of float
when put into liquid CO2. Remember that 1 mL = 1 cm^3.
Mass - 15.62g, 10cm^3 - correct answer 15.62g/10cm^3 = 1.562g/cm^3
Find the density of ice. Determine whether the solids will sink or float when put into
liquid CO2. Remember that 1 mL = 1 cm^3.
Mass - 9.34g, 10cm^3 - correct answer 9.34g/10cm^3 = 0.934g/cm^3
Mean equation - correct answer add up all the data and divide by # of data points
