
Lesson 2.2 Homework
Authored by Viktoriia Lazarenko
Chemistry
8th Grade
Used 1+ times

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33 questions
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1.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
How would you separate the water from seawater?
Filtration
Distillation
Sedimentation
Decantation
2.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
How would you separate the ethanol from an ethanol+water solution?
Simple distillation
Filtration
Fractional distillation
Evaporation
3.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
What do you understand by the term sublimation?
The process by which a liquid changes directly into a gas
The process by which a solid changes directly into a gas
The process by which a gas changes directly into a solid
The process by which a solid changes directly into a liquid
4.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
What type of substance was chromatography originally designed to separate?
Colorless substances
Ions in a solution
Colored substances
Gases in a mixture
5.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
How can we now extend the use of chromatography to separate colorless substances?
By using heat
By using techniques such as UV light, chemical reagents, or staining
By changing the solvent
By increasing the sample size
6.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Define the term Rf value in connection with chromatography.
The distance traveled by the substance divided by the distance traveled by the solvent
The distance traveled by the substance divided by the distance traveled by the solute
The distance traveled by the solute divided by the distance traveled by the solvent
The distance traveled by the solvent divided by the distance traveled by the substance
7.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Декантація
Filtration
Centrifugation
Decanting
Crystallisation
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