CHM101 Lab Final Exam (NEW 2025/ 2026
Update) Introduction to General, Organic,
and Biochemistry Questions & Answers
Grade A 100% Correct (Verified Solutions)-
GCU
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.
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
,CHM101 Lab Final Exam (NEW 2025/ 2026
Update) Introduction to General, Organic,
and Biochemistry Questions & Answers
Grade A 100% Correct (Verified Solutions)-
GCU
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
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.
, CHM101 Lab Final Exam (NEW 2025/ 2026
Update) Introduction to General, Organic,
and Biochemistry Questions & Answers
Grade A 100% Correct (Verified Solutions)-
GCU
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
Standard deviation equation - correct answer 1. find the mean
2. subtract the mean from each data point
3. square the answer ^
4. find the mean of the new data points by adding them up and dividing by 1/N
5. take the square root of that answer
Coefficient of variation - correct answer measure of precision as a % of the value
measured
Coefficient of variation equation - correct answer standard deviation/mean * 100
Update) Introduction to General, Organic,
and Biochemistry Questions & Answers
Grade A 100% Correct (Verified Solutions)-
GCU
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.
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
,CHM101 Lab Final Exam (NEW 2025/ 2026
Update) Introduction to General, Organic,
and Biochemistry Questions & Answers
Grade A 100% Correct (Verified Solutions)-
GCU
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
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.
, CHM101 Lab Final Exam (NEW 2025/ 2026
Update) Introduction to General, Organic,
and Biochemistry Questions & Answers
Grade A 100% Correct (Verified Solutions)-
GCU
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
Standard deviation equation - correct answer 1. find the mean
2. subtract the mean from each data point
3. square the answer ^
4. find the mean of the new data points by adding them up and dividing by 1/N
5. take the square root of that answer
Coefficient of variation - correct answer measure of precision as a % of the value
measured
Coefficient of variation equation - correct answer standard deviation/mean * 100
