CHEM 101: Lab Exam Questions and
Answers Graded A
What type of spectrum is emitted by gaseous discharge tubes? - Answer-A discontinuous
spectrum
White light from the sun emits what type of spectrum? - Answer-A continuous spectrum
from red to violet
How are photons emitted in discharge tubes? ...
What is the filtrate? - Answer✔✔-The liquid that passes through the filter into the filter flask
Efflorescent - Answer✔✔-Hydrates that spontaneously lose water to the atmosphere
How does efflorescence occur? - Answer✔✔-This loss of water occurs because the vapor
pressure of water exerted by efflorescent solids is greater that that of the vapor pressure of
water in the surrounding atmosphere
Hygroscopic - Answer✔✔-Hydrates that spontaneously absorb water from the atmosphere
Why may Hygroscopic hydrates, that spontaneously absorb water from the atmosphere, be
termed dessicates? - Answer✔✔-Because they are used a dry liquid/gas
Deliquescent - Answer✔✔-When a compound absorbs water from the atmosphere so strongly
that it dissolves in its own hydration
How do you go about removing water of crystilization from a hydrate that is stable at room
temperature? - Answer✔✔-It must be heated to a temperature at which the vapour pressure of
the water exerted by the solid hydrate exceeds the partial pressure of water in the atmosphere
above the solid
When all the water is gone from the hydrate, the compound is in its ________________ form -
Answer✔✔-Anhydrous
As a hydrate is heated, and the water of hydration is driven off, the compound may undergo one
or more of the following changes? - Answer✔✔-1) It may undergo a colour change
2) The form of the crystal may change
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