CHEM 219 LAB EXAMS 5 TO 8 ACTUAL
QUESTIONS AND CORRECT ANSWERS
◉ Choose the most efficient and accurate way to prepare a sample
containing 0.75 moles of iron (Fe) atoms.
Answer: Weigh 41.89 grams of iron.
◉ If a student knows ahead of time that he/she must miss a lab for
an excused event, he/she should...
Answer: 1-arrange with the Lab Coordinator or TA to attend the
same lab experiment at a different time during the week
(procedures at CH102/CH202 Moodle at http://wolfware.ncsu.edu).
2-plan to have the missing in-lab score replaced by the final exam
percentage divided by two if the student cannot attend an alternate
lab during the week. 3-contact the instructor in advance.
◉ If a student is absent due to sudden illness or emergency, he/she
should...
Answer: 1-contact the instructor as soon as possible and within 24
hours of the absence. 2-plan to have the missing in-lab score
replaced by the final exam percentage divided by two if the student
cannot attend an alternate lab during the week. 3-arrange with the
Lab Coordinator or TA to attend the same lab experiment at a
different time during the week (procedures at CH102/CH202
Moodle at http://wolfware.ncsu.edu).
,◉ If a student must miss TWO regular semester labs for excused
events, he/she should...
Answer: 1-plan on receiving an incomplete for the lab course. 2-be
sure to have documentation for the absences.
◉ Choose all the statements that correctly describe the policy for lab
cancellations due to university closure. See the syllabus section of
the Lab Manual.
Answer: 1-Students may be provided with sample data or a video in
order to complete the in-lab assignment.2-The student's in-lab grade
may be composed of one less in-lab assignment. 3-Students are still
responsible for the WebAssign prelab and postlab. 4-Labs are
cancelled when the university is operating under the Adverse
Weather Policy.
◉ A student can get help with CH102..
Answer: at the Tutorial Center in FOX 152. by making an
appointment to see his/her instructor. via the "Help Desk" or "Ask
Your Teacher" feature in WebAssign.
◉ In the flame test experiment, you will be working with two types
of hazard. Which are they? (Select all that apply.)
Answer: open flame and hydrochloric acid, corrosive solution
,◉ When working with a Bunsen burner, which of the following
precautions must be observed? (Select all that apply.)
Answer: everything except "The burner must never be used in the
presence of oxygen." and "The burner must never be used to heat
metal."
◉ If one spills hydrochloric acid on one's hands, what is the FIRST
thing one should do?
Answer: rinse them in running water
◉ What should be done with the wastes in the Flame Test
experiment?
Answer: They should be flushed down the sink with plenty of water.
◉ What is the hottest part of a Bunsen burner flame?
Answer: the tip of the inner, dark blue cone
◉ The valve on the bottom of the burner controls which of the
following?
Answer: the gas flow
◉ Twisting the sleeve to open the holes (baffles) above the base of
the burner does which of the following?
Answer: allows more air (oxygen) into the flame
, ◉ When cleaning the wire between flame tests, most of the cleaning
is accomplished when?
Answer: while rinsing the wire with acid
◉ Color in a substance arises from which two closely related
processes?
Answer: absorption and emission
◉ What process is occurring when the solution is heated?
Answer: An electron absorbs energy and it makes a transition to a
higher energy orbital.
◉ What process is occurring when the color appears in the flame?
Answer: An electron emits energy and it makes a transition to a
lower energy orbital.
◉ Which two quantities are inversely proportional to one another?
Answer: frequency and wavelength
◉ Which of the following is a true statement?
Answer: 390 nm blue light is higher in energy than 610 nm yellow
light
QUESTIONS AND CORRECT ANSWERS
◉ Choose the most efficient and accurate way to prepare a sample
containing 0.75 moles of iron (Fe) atoms.
Answer: Weigh 41.89 grams of iron.
◉ If a student knows ahead of time that he/she must miss a lab for
an excused event, he/she should...
Answer: 1-arrange with the Lab Coordinator or TA to attend the
same lab experiment at a different time during the week
(procedures at CH102/CH202 Moodle at http://wolfware.ncsu.edu).
2-plan to have the missing in-lab score replaced by the final exam
percentage divided by two if the student cannot attend an alternate
lab during the week. 3-contact the instructor in advance.
◉ If a student is absent due to sudden illness or emergency, he/she
should...
Answer: 1-contact the instructor as soon as possible and within 24
hours of the absence. 2-plan to have the missing in-lab score
replaced by the final exam percentage divided by two if the student
cannot attend an alternate lab during the week. 3-arrange with the
Lab Coordinator or TA to attend the same lab experiment at a
different time during the week (procedures at CH102/CH202
Moodle at http://wolfware.ncsu.edu).
,◉ If a student must miss TWO regular semester labs for excused
events, he/she should...
Answer: 1-plan on receiving an incomplete for the lab course. 2-be
sure to have documentation for the absences.
◉ Choose all the statements that correctly describe the policy for lab
cancellations due to university closure. See the syllabus section of
the Lab Manual.
Answer: 1-Students may be provided with sample data or a video in
order to complete the in-lab assignment.2-The student's in-lab grade
may be composed of one less in-lab assignment. 3-Students are still
responsible for the WebAssign prelab and postlab. 4-Labs are
cancelled when the university is operating under the Adverse
Weather Policy.
◉ A student can get help with CH102..
Answer: at the Tutorial Center in FOX 152. by making an
appointment to see his/her instructor. via the "Help Desk" or "Ask
Your Teacher" feature in WebAssign.
◉ In the flame test experiment, you will be working with two types
of hazard. Which are they? (Select all that apply.)
Answer: open flame and hydrochloric acid, corrosive solution
,◉ When working with a Bunsen burner, which of the following
precautions must be observed? (Select all that apply.)
Answer: everything except "The burner must never be used in the
presence of oxygen." and "The burner must never be used to heat
metal."
◉ If one spills hydrochloric acid on one's hands, what is the FIRST
thing one should do?
Answer: rinse them in running water
◉ What should be done with the wastes in the Flame Test
experiment?
Answer: They should be flushed down the sink with plenty of water.
◉ What is the hottest part of a Bunsen burner flame?
Answer: the tip of the inner, dark blue cone
◉ The valve on the bottom of the burner controls which of the
following?
Answer: the gas flow
◉ Twisting the sleeve to open the holes (baffles) above the base of
the burner does which of the following?
Answer: allows more air (oxygen) into the flame
, ◉ When cleaning the wire between flame tests, most of the cleaning
is accomplished when?
Answer: while rinsing the wire with acid
◉ Color in a substance arises from which two closely related
processes?
Answer: absorption and emission
◉ What process is occurring when the solution is heated?
Answer: An electron absorbs energy and it makes a transition to a
higher energy orbital.
◉ What process is occurring when the color appears in the flame?
Answer: An electron emits energy and it makes a transition to a
lower energy orbital.
◉ Which two quantities are inversely proportional to one another?
Answer: frequency and wavelength
◉ Which of the following is a true statement?
Answer: 390 nm blue light is higher in energy than 610 nm yellow
light
