1. Students will be able to: Agenda:
Aim: How can we use physical properties to separate substances found in mixtures?
Students will be able to:
Explain the processes of filtration, crystallization, and distillation
Design a method to separate sand and salt from an aqueous mixture.
Agenda:
Do Now: 5 min
PPT Lesson: 15 min
Lab: 30 minutes
Wrap-Up: 5 min
HW: Regents Q’s

2. Do Now:
You are preparing a spaghetti dinner for your family. How would you separate the pasta from the boiling water? What physical property allows you to separate the mixture?

3. Three types of separation techniques
Filtration: Uses a filter to separate a liquid and a solid
Crystallization: Evaporates water to separate a solid and a liquid.
Distillation: Separates a liquid from other liquids or solids.

4. Filtration Example: Sand (SiO2) and water (H2O)
Why does a filter effectively separate this mixture?

5. Crystallization
Ex: making rock candy from a mixture of sugar and water

6. Distillation: Separating a liquid from other liquids or solids and boiling and re-cooling

8. Scenario 1: Mr. Zavrel is making coffee by pouring hot water onto coffee grounds and letting it brew for five minutes. However, he needs to find a way to separate the brewed coffee from the coffee grounds.
a) Which process would you use to separate the brewed coffee from the coffee grounds?
b) Why would this method work well?

9. Scenario 2: Mr. Fine has a solution of a 70% isopropyl alcohol and 30% H2O, which is sold at drugstores to put on wounds to kill bacteria. He needs pure, 100% isopropyl alcohol for a chemistry experiment. H2O boils at 100 C and isopropyl alcohol boils at C.
a) Which technique would you use to separate the mixture?
b) Why would this method work well?
c) Would this procedure still work if H2O and isopropyl alcohol both boiled at 100C? Why or why not?

10. Scenario 3: In 1946, Mohandas Gandhi conducted the salt march in India to protest the British’s requirement that Indians buy salt from Britain. He led over 80,000 people on a 240 mile walk to the Indian Ocean to take salt water, NaCl (aq) from the ocean and make salt. When salt is dissolved in water, the salt, called sodium chloride, completely dissolves in the water. NaCl(s) becomes NaCl(aq). When the salt is dissolved, it can pass through standard filter paper.
a) Which separation technique would you use?
b) Why?
c) Is the salt water, NaCl(aq), a pure substance, a homogeneous mixture, or a heterogeneous mixture?