CHEM 219 LAB EXAMS 5 TO 8
COMPREHENSIVE STUDY GUIDE WITH
SOLUTIONS
◉ 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
◉ Which ion emitted the higher energy photons in the visible
region: Cu2+ or Sr2+?
Answer: Copper(II) ions emitted higher energy photons than
strontium ions since the copper(II) ions emitted light at a shorter
wavelength.
◉ Which ion emitted photons with the longer wavelength in the
visible region: K+ or Na+?
Answer: Sodium ions emitted longer wavelength photons than
potassium ions since the sodium ions emitted light at a lower
frequency.
◉ Which ion emitted the lower frequency photons in the visible
region: Ca2+ or K+?
Answer: Calcium ions emitted lower frequency photons than
potassium ions since the calcium ions emitted light at a lower
energy.
◉ From the data collected and the information gained in lecture,
would the anion have a dramatic effect on the color of the light
COMPREHENSIVE STUDY GUIDE WITH
SOLUTIONS
◉ 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
◉ Which ion emitted the higher energy photons in the visible
region: Cu2+ or Sr2+?
Answer: Copper(II) ions emitted higher energy photons than
strontium ions since the copper(II) ions emitted light at a shorter
wavelength.
◉ Which ion emitted photons with the longer wavelength in the
visible region: K+ or Na+?
Answer: Sodium ions emitted longer wavelength photons than
potassium ions since the sodium ions emitted light at a lower
frequency.
◉ Which ion emitted the lower frequency photons in the visible
region: Ca2+ or K+?
Answer: Calcium ions emitted lower frequency photons than
potassium ions since the calcium ions emitted light at a lower
energy.
◉ From the data collected and the information gained in lecture,
would the anion have a dramatic effect on the color of the light
