CHM2045 Lab Final Questions And Answers Guaranteed Success.
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CHM2045 Lab
CHM2045 Lab Final Questions And Answers Guaranteed Success.
(experimental - actual)/(actual) x 100% - correct answer. Write out the percent error equation (% error)
systematic errors - correct answer. errors that people make over and over and that result in poor decisi...
CHM2045 Lab Final Questions And
Answers Guaranteed Success.
(experimental - actual)/(actual) x 100% - correct answer. Write out the percent error
equation (% error)
systematic errors - correct answer. errors that people make over and over and that
result in poor decision making
density - correct answer. an intensive property of matter that is calculated as
mass/volume or g/mL
mass solute/(mass solute + mass solvent) x 100 - correct answer. Write the mass
percent solute equation (mass % solute)
false - correct answer. True or false
Sodium chloride solution is consider hazardous according to GHS classifications for the
Hazard Communication Standard.
36.5 - correct answer. What is the volume indicated, to the correct number of
significant figures?
116.26 - correct answer. Melanie obtains a value of 2.58 g/mL for the density of her
unknown solution. The actual density of the solution is 1.193 g/mL.
What is the % error of Melanie's measurement? Express your response to two digits
after the decimal.
1.255 - correct answer. Jason measures three values of density for his unknown.
The values he obtains are:
,1.317 g/mL
1.36 g/mL
1.088 g/mL
What is the average of his three measurements? Express your response to three digits
after the decimal.
8.123 - correct answer. A student obtains the following data:
Mass of empty, dry graduated cylinder: 23.688 g
Volume added of NaCl solution: 2.965 mL
Mass of graduated cylinder + NaCl solution: 47.773 g
What is the density of the solution? Express your answer to 3 digits after the decimal.
130.789 - correct answer. Jill creates a standard curve of mass vs. volume for a
series of solutions. Her curve equation was:
y=0.0076x + 0.996
She is provided with a solution of unknown concentration (mass %). If the density of the
unknown solution is 1.99 g/mL, what is the concentration of the solution, expressed as
mass %? Provide a numerical response, without units, to 3 digits after the decimal.
True - correct answer. True or false
Hot objects can look like cold objects.
true - correct answer. True or false
Hydrated magnesium sulfate: this chemical is considered nonhazardous according to
GHS classifications for the Hazard Communication Standard
false - correct answer. True or false
Hydrated copper (II) sulfate is not toxic if swallowed. One is able to eat, drink, and
smoke it.
true - correct answer. True or false
Hydrates copper (II) sulfate causes serious skin and eye irritations
Hydrated manganese (II) sulfate may cause damage to organs through repeated
exposure. One should not eat, drink, or smoke this compound.
hydrate - correct answer. a crystalline compound in which one or more water
molecules are combines with each formula unit of the salt. (ie: CuSO4 x 5H2O)
1. blue
2. white
3. green
4. yellow - correct answer. List the colors of each of these:
1. CuSO4 x 5H2O
2. CuSO4 (anhydrous)
3. NiSO4 x 7H2O
4. NiSO4 (anhydrous)
(mass water lost)/(mass of hydrate) x 100% - correct answer. Write out the mass
percent of water (% water)
(moles water)/(moles anhydrous salt) - correct answer. Write out the empirical
formula equation for a hydrate (salt x H2O)
10.772 - correct answer. A student heats a sample of hydrate once, and the mass of
the sample and the evaporating dish is 17.25 g. After a second heating cycle, the mass
of the sample and the dish is 14.562 g. The student stops the heat/cool/weigh cycle
after the second time.
If the original mass of the evaporating dish and the hydrate was 25.334 g, and the mass
of the evaporating dish was 1.542 g, what is the mass of water removed from the
sample by heating?
Provide your response to three digits after the decimal.
16.156 - correct answer. A student is told the theoretical mass % water in her
sample is 64.572%
She obtains an experimental value of 54.15% when she performs the lab activity.
What is her % error? Report your answer to three digits after the decimal.
0.285 - correct answer. Sam records the mass of his evaporating dish as 6.343 g.
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