Author: Richard Warren

Separating the Components of a Mixture Web Quest

Today’s Objectives:

Students will be able to select an appropriate way of separating the components of a mixture, including:

•	Relate the method of separation to the properties of the mixtures components 

•	Understand various mechanical methods used to separate components of a mixture 

Introduction:

Today you and your partner will be using the internet to learn about the various methods of separating components of a mixture. Each of these methods take advantage of differences in the physical properties of the substances involved. These methods can be used to separate various types of mechanical mixtures and solutions. After answering the questions and completing the tables below, you will try an online quiz. You may use other websites but they MUST be approved by your teacher. For the following questions, use the following websites: 
https://www.chemteam.info/Matter/SeparationOfMixtures.html

http://www.gcsescience.com/e1-element-compound-mixture.htm 

http://www.eschooltoday.com/science/elements-mixtures-compounds/separation-of-mixtures.html

http://www.kentchemistry.com/links/Matter/separation.htm

1.	Hand Separation: 

a.	What type of mixture(s) can be separated by hand separation? 

b.	When would a magnet be used during hand separation? 

c.	When would a sieve be used during hand separation? 

d.	What property of matter does this method depend on? 

2.	Filtration: 

a.	What type of mixture(s) can be separated by filtration? 

b.	What is filtrate? 

c.	What is residue? 

d.	What property of matter does this method depend on? 

e.  Draw a labeled diagram of the filtration apparatus in the box.

3.	Evaporation: 

a.	What type of mixture(s) can be separated by evaporation? 

b.	How is the evaporation method used to separate a mixture? 

c.	What property of matter does this method depend on? 

4.	Distillation: 

a.	What type of mixture(s) can be separated by distillation? 

b.	What property of matter does this method depend on? 

c.	Which liquid is collected as the distillate? 

d.	Draw a labeled diagram of the distillation apparatus in the box 

5.	Solvent Extraction: 

a.	What type of mixture(s) can be separated by solvent extraction? 

b.	How many phases would you have if 2 liquids are miscible? 

c.	How many phases would you have if 3 liquids are immiscible? 

d.	What property of matter does solvent extraction depend on? 

e.	During solvent extraction, which layer is on top and which layer is at the bottom? 

f.	Draw a labeled diagram of the solvent extraction apparatus in the box. 

6.	Re-crystallization (Crystallization): 

a.	What types of mixture(s) can be separated by re-crystallization? 

b.	What property of matter does re-crystallization depend on? 

c.	During re-crystallization, a solution is warmed allowing the solvent to evaporate, leaving a saturated solution. What is a saturated solution? What happens when the saturated solution is allowed to cool? 

7.	Gravity Separation (Centrifugation): 

a.	What types of mixture(s) can be separated by gravity separation? 

8.	Chromatography: 

a.	What type of mixture(s) can be separated by chromatography? 

Complete the following tables:

Mechanical Mixtures

Mixture | Method | When to use method
Solid in Solid | | Large chunks present among the solids
| | The density of the desired solids is much different from the density of the
| | other solids
| | One solid dissolves more easily in a particular solvent
| | The solids are colored, present in small amounts, and are soluble in some
| | solvent or mixture of solvents
Solid in Liquid | | A few large pieces of solid are present in the liquid
| | Solid particles are present in a small amount of liquid
| | Solid particles are present in a large amount of liquid
Solutions | |
| Mixture | Method | When to use method
| Solid in Liquid | | The solid is wanted and the liquid is not
| | | The liquid is wanted; the solid may or may not be wanted
| | | An immiscible added solvent dissolves one or more solid more easily than
| | | other solids
| | | One dissolved solid is much less soluble than the others present; the liquid
| | | is not wanted
| | | Small amounts of more than one colored solid are present; the liquid
| | | present is not wanted
| Liquid in Liquid | | Two or more liquids are present and have different boiling temperatures
| | | An immiscible added solvent preferentially dissolves at least one but not
| | | all of the liquids present

Finished? Try the quiz found at this website:

http://www.softschools.com/quizzes/chemistry/mixtures_separation/quiz804.html

What was your score?