CHEM 1411 REVIEW LAB PRACTICAL QUESTIONS + ANSWERS + STUDY
GUIDE - LATEST 2026 VERSION
When should approved eye protection be worn in the lab?
All the time.
What should you do if a chemical is spilled on the table?
Clean it up right away.
How is a liquid properly taken into a pipette?
Using a pipette bulb or a pipette pump (never by mouth).
Where should experiments involving chemicals with irritating vapors be
performed?
In the fume hood.
How should all hazardous waste be handled?
It should be placed in a designated special waste container.
Physical & Chemical Properties
What type of mixture is a combination of sand and salt?
A heterogeneous mixture.
, Shutterstock
How do you calculate the percent error if a sand-salt mixture should
contain 20.00% salt but you recovered 7.55%?
$$\text{Percent Error} = \left| \frac{20.00 - 7.55}{20.00} \right| \times 100$$
(Note: High error could be due to splattering during heating, incomplete
dissolution, or loss of material during filtration).
In filtration, what is the difference between the precipitate and the filtrate?
The precipitate is the solid substance that remains on the filter paper; the
filtrate is the liquid that passes through.
What technique is used to separate a mixture of sand and salt solution?
GUIDE - LATEST 2026 VERSION
When should approved eye protection be worn in the lab?
All the time.
What should you do if a chemical is spilled on the table?
Clean it up right away.
How is a liquid properly taken into a pipette?
Using a pipette bulb or a pipette pump (never by mouth).
Where should experiments involving chemicals with irritating vapors be
performed?
In the fume hood.
How should all hazardous waste be handled?
It should be placed in a designated special waste container.
Physical & Chemical Properties
What type of mixture is a combination of sand and salt?
A heterogeneous mixture.
, Shutterstock
How do you calculate the percent error if a sand-salt mixture should
contain 20.00% salt but you recovered 7.55%?
$$\text{Percent Error} = \left| \frac{20.00 - 7.55}{20.00} \right| \times 100$$
(Note: High error could be due to splattering during heating, incomplete
dissolution, or loss of material during filtration).
In filtration, what is the difference between the precipitate and the filtrate?
The precipitate is the solid substance that remains on the filter paper; the
filtrate is the liquid that passes through.
What technique is used to separate a mixture of sand and salt solution?
