Lesson 16 Researching Solvents. Lesson 16 - Researching Solvents You will conduct an investigation to show how solvents can remove stains.

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Presentation transcript:

Lesson 16 Researching Solvents

Lesson 16 - Researching Solvents You will conduct an investigation to show how solvents can remove stains.

Lesson 16 - COS

Objectives Discuss solvents and their uses. Design and conduct an inquiry on stain removal. Present your results to the rest of the class.

Getting Taken to the Cleaners What is dry cleaning?

Getting Taken to the Cleaners Cleaning without using water

Getting Taken to the Cleaners List 3 reasons why you may want/need to have your clothes dry cleaned?

Getting Taken to the Cleaners 1.To clean clothes that might otherwise be harmed by water. 2. To prevent clothes from shrinking 3. To remove stains that are insoluble in water.

Getting Taken to the Cleaners What was the 1 st dry cleaning solvent?

Getting Taken to the Cleaners kerosene

Getting Taken to the Cleaners Why isn’t it used anymore?

Getting Taken to the Cleaners Because it is flammable

Getting Taken to the Cleaners What solvent is currently used?

Getting Taken to the Cleaners tetrachloroethylene

Getting Taken to the Cleaners What is a disadvantage of this solvent?

Getting Taken to the Cleaners It has toxic fumes in enclosed spaces.

Getting Taken to the Cleaners Explain how dry cleaning works

Getting Taken to the Cleaners Clothes are placed in a giant machine similar to a washing machine. Tetrachloroethylene is mixed with a very small amount of water and a special detergent. This solvent flows through the machine until the clothes are clean. The solvent remaining on the clothes evaporates and is recycled.

Getting Started In your notebook, list several examples of liquids that do not contain water.

Lesson 16 - No new vocabulary.

Lesson 16 - How effective are various solvents at removing a variety of stains?

Lesson 16 If….. then…. because…

SAFETY Wear your safety goggles throughout the inquiry. Take care not to get solvents or stains on your clothes. Do not taste any of the substances. If you spill rubbing alcohol or kerosene, immediately tell your teacher.

Lesson 16 - Design a test that can be used to compare the effectiveness of three solvents (water, rubbing alcohol, kerosene) to remove stains (ketchup, chocolate syrup, vegetable oil, ink).

Results StainSolvent results WaterIsopropyl alcohol Kerosene Ketchup Chocolate syrup Vegetable oil Marker pen ink Ballpoint pen ink

Lesson 16 - Water and other liquids can act as solvents……….