FINAL EXAM LAB: BSC1010L EXAM QUESTIONS AND
ANSWERS WITH COMPLETE SOLUTIONS VERIFIED.
- Lab 2 -
Why is it important to be precise and accurate when making scientific
measurements?
a. To ensure that our hypothesis is always correct.
b. It is better to be accurate, than inaccurate for all things in life.
c. To ensure our experiments are repeatable, and reproduceable.
d. If you are accurate, you will always get the outcome you expect from an
experiment.
c. To ensure our experiments are repeatable, and reproduceable.
How many centimeters are in one kilometer?
100,000 cm
How many milliliters are in 3 liters?
3,000 ml
(1,000 ml in 1 liter)
How many kilograms are in 4 000 000 micrograms?
0.004
(divide the mass value by 1e+9)
When you observed that salt dissolved in water, but not in oil, what characteristic
of water did this demonstrate?
,a. Water is an excellent solute.
b. Water has a high boiling point.
c. Water contains ionic bonds.
d. Water is an excellent solvent.
d. Water is an excellent solvent.
When you observed that two glass microscope slides became difficult to pull
apart when a drop of water is placed between them, what property of water did
this demonstrate?
a. Water is cohesive.
b. Water is adhesive.
c. Water has a strong surface tension.
d. Water regulates temperature.
b. Water is adhesive.
How do you evaluate the precision of a set of repeated measurements?
a. Calculate the standard deviation.
b. Calculate the mean.
c. Check your measurements are always the same.
d. Be as careful as possible when making measurements.
a. Calculate the standard deviation.
How do you evaluate the accuracy of a set of repeated measurements?
a. Calculate the standard deviation.
b. Calculate the mean.
c. Check your measurements are always the same.
, d. Be as careful as possible when making measurements.
b. Calculate the mean.
Why does water dissolve sodium chloride?
a. Sodium Chloride is salt - which evolved in the oceans with water molecules.
b. Sodium chloride is a polar molecule, which allows it to form hydrogen bonds
with water.
c. The hydrogen bonds between water molecules are stronger than the ionic
bonds found in sodium chloride.
d. The polar structure of water allows water molecules to disrupt the ionic bonds
between sodium and chloride ions.
d. The polar structure of water allows water molecules to disrupt the ionic bonds
between sodium and chloride ions.
Why do oil and water not mix?
a. Water is non-polar.
b. Water molecules are covalent
c. Oil is non-polar
d. Oil is polar
c. Oil is non-polar
- Lab 3 (Biomolecules) -
Which of the following reagents tests for the presence of monosaccharides?
a. Lugol iodine
b. Benedict's solution
c. Biuret solution
ANSWERS WITH COMPLETE SOLUTIONS VERIFIED.
- Lab 2 -
Why is it important to be precise and accurate when making scientific
measurements?
a. To ensure that our hypothesis is always correct.
b. It is better to be accurate, than inaccurate for all things in life.
c. To ensure our experiments are repeatable, and reproduceable.
d. If you are accurate, you will always get the outcome you expect from an
experiment.
c. To ensure our experiments are repeatable, and reproduceable.
How many centimeters are in one kilometer?
100,000 cm
How many milliliters are in 3 liters?
3,000 ml
(1,000 ml in 1 liter)
How many kilograms are in 4 000 000 micrograms?
0.004
(divide the mass value by 1e+9)
When you observed that salt dissolved in water, but not in oil, what characteristic
of water did this demonstrate?
,a. Water is an excellent solute.
b. Water has a high boiling point.
c. Water contains ionic bonds.
d. Water is an excellent solvent.
d. Water is an excellent solvent.
When you observed that two glass microscope slides became difficult to pull
apart when a drop of water is placed between them, what property of water did
this demonstrate?
a. Water is cohesive.
b. Water is adhesive.
c. Water has a strong surface tension.
d. Water regulates temperature.
b. Water is adhesive.
How do you evaluate the precision of a set of repeated measurements?
a. Calculate the standard deviation.
b. Calculate the mean.
c. Check your measurements are always the same.
d. Be as careful as possible when making measurements.
a. Calculate the standard deviation.
How do you evaluate the accuracy of a set of repeated measurements?
a. Calculate the standard deviation.
b. Calculate the mean.
c. Check your measurements are always the same.
, d. Be as careful as possible when making measurements.
b. Calculate the mean.
Why does water dissolve sodium chloride?
a. Sodium Chloride is salt - which evolved in the oceans with water molecules.
b. Sodium chloride is a polar molecule, which allows it to form hydrogen bonds
with water.
c. The hydrogen bonds between water molecules are stronger than the ionic
bonds found in sodium chloride.
d. The polar structure of water allows water molecules to disrupt the ionic bonds
between sodium and chloride ions.
d. The polar structure of water allows water molecules to disrupt the ionic bonds
between sodium and chloride ions.
Why do oil and water not mix?
a. Water is non-polar.
b. Water molecules are covalent
c. Oil is non-polar
d. Oil is polar
c. Oil is non-polar
- Lab 3 (Biomolecules) -
Which of the following reagents tests for the presence of monosaccharides?
a. Lugol iodine
b. Benedict's solution
c. Biuret solution
