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WorksheetsQUAL review
Total questions: 20
Worksheet time: 15mins
Which of the following would help you determine if ions are present in a solution?
smell (volatility)
adding an indicator such as PHTH or phenol red
looking at the test tube directly
using a conductivity meter
What does the down arrow ↓ symbolize? (a)
Choose all that apply.
Which of the following liquids would cause a conductivity meter to shine brightly?
HCl
sucrose
Pb(NO3)2
Ca(OH)2
H2O
Which shape is used to indicate a conclusion in a flow chart? (a)
Which shape is used to ask a question that requires a yes/no answer/ (a)
Choose all that apply.
What would be a useful method to identify Ca(OH)2 as a base?
add Mg to produce H2 ↑
add NaHCO3 to produce CO2 ↑
add PHTH to see if the solution turns bright pink
add phenol red to see if the solution turns yellow
What is the formula of the yellow precipitate that forms?
PbI ↓
PbCl2 ↓
CuI2↓
NOR
PbI2 ↓
True or False?
A valid flow chart question is: Is the solution conductive?
(a)
Choose all that apply.
Which reagents would form a precipitate with CaI2?
Pb(NO3)2
CoCl2
PHTH
CuSO4
How do you get help during QUAL testing days? (a)
Choose all that apply.
Which of the following are bases?
NaHCO3
phenol red
PHTH
KOH
HCl
Which reagent would form a precipitate if mixed with K2SO4? (a)
What gas is formed when Mg metal is added to an acid? (a)
Choose all that apply.
When should you clean a conductivity meter?
before using it
after using it
only when it looks dirty
between each chemical test
Solutions of MgSO4 + Na2SO4 are combined. What occurs?
NOR
MgSO4 ↓ white
H2 ↑
Choose all that apply.
Which of the following would be an accurate item to write in a diamond shape of a flow chart?
Solution ________ is sucrose
Does a gas ↑ form?
Does Pb(OH)2 ↓ form?
Use a conductivity meter in all solutions.
Does CuCO3 ↓ light blue form?
True or False?
A valid flow chart question is: Does no reaction occur?
(a)
It is a good idea to rinse your spot plate with distilled water
at the end of each testing day
after checking your final answers
when reusing the spot plate
each time you start testing a new set of chemicals
Choose all that apply.
Which materials do you have available for testing unknowns?
phenol red
PHTH
NaHCO3
Zn metal
HCl
Match the results with the action step you could take in order to identify an unknown liquid as HCl.
H2 ↑ fizz
add Mg metal
CO2 ↑ fizz
add NaHCO3
PbCl2 ↓ white, needle-like, slow forming
add Pb(NO3)2
