CHM 2046L - Final Exam Questions Answered & Graded
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Course
Chem 2046L UCF
Institution
Chem 2046L UCF
True or False: If you are late to class, you can take the quiz after the lab is over - Correct Answer False
List 4 pieces of PPE (personal protective equipment) that must always be worn in the lab - Correct Answer - Safety goggles
- Lab coat
- Long pants/skirts
- No crop tops
- Long hair t...
CHM 2046L - Final Exam Questions Answered &
Graded
True or False: If you are late to class, you can take the quiz after the lab is over - Correct Answer False
List 4 pieces of PPE (personal protective equipment) that must always be worn in the lab - Correct
Answer - Safety goggles
- Lab coat
- Long pants/skirts
- No crop tops
- Long hair tied up
True or False: The volume of a mixture is always the same as the sum of the individual volumes - Correct
Answer False
Ex. When mixing 10mL of rubbing alcohol with 10mL of water, the total volume will be less than 20mL
Is the mass of a mixture always the sum of the individual masses? How is that different than volume? -
Correct Answer Yes, due to the law of consideration of mass, masses are additive. Volumes are not
additive due to the different molecular components of each liquid (size of molecules)
What is your GTA's name? - Correct Answer Krystal Baez
Accuracy - Correct Answer How close a measurement is to the true/actual value
Precision - Correct Answer How close together, or common, the measurements are
How would you round a graduated cylinder measurement? - Correct Answer Ex. 2.65
How does TD dictate how glassware is used in the lab? - Correct Answer TD = To deliver a liquid
Ex. Pipettes, burets
, How does TC dictate how glassware is used in the lab? - Correct Answer TC = To contain
Ex. Beaker, volumetric flask
Why are students expected to develop their own experimental procedures in the chemistry lab? -
Correct Answer To develop critical thinking skills and increase their understanding of chemistry concepts
Random Error - Correct Answer Errors cannot be fixed and therefore can only be accounted for
Systematic Error - Correct Answer Errors that always occurs in the same direction; can be fixed
Find the density of a substance that has a mass of 49.87g and a volume of 50.0mL - Correct Answer
Density = Mass/Volume
Density = 49.87g/50.0mL
An aqueous solution of calcium carbonate (CaCO3) does not make the light bulb light up. Use chemical
terminology to explain why this might be - Correct Answer CaCO3 does not conduct electricity or ionize
in solutions because it is a nonelectrolyte
Dissociation - Correct Answer Substance breaks down into components of ions (does not include
nonelectrolytes)
Solubility - Correct Answer The ability of a substance to dissolve in another (includes strong, weak, and
nonelectrolytes); not dependent on amount of ionization
Classify each of the following compounds as either strong electrolyte, weak electrolyte, or a
nonelectrolyte
a. Sodium Chloride (NaCl)
b. Hydrochloric Acid (HCl)
c. Sugar (Glycose) - Correct Answer a. Strong electrolyte
b. Strong electrolyte
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