In part I you observed the physical properties of 7 common house hold substances. o You observed the color, texture, smell, etc.

In part II you will apply common tests to each substance. o Solubility in water (normal, hot, alcohol), pH (acid-neutral-

base), gas production, precipitation, presence of starch. o Testing for both physical and chemical characteristics

• Solubility: describes the ability of a given substance, the solute, to dissolve in a solvent.

• Physical or Chemical Property?

• Physical Property

• What to look for

• Does the compound being tested contain starch?

• What is Starch?– Carbohydrate

• What does a positive test look like?

• Phenolphthalein – indicator that tests for acidity/alkalinity – 1-8 Clear (acid or neutral)– 8-12 (alkaline/base)

• What does a positive test look like?

• Physical or Chemical Property?

• Vinegar added to a substance containing a carbonate will produce gas

• What does a positive test look like?

• Physical or Chemical Property?

• What is a precipitant?– is the formation of a solid in a

solution during a chemical reaction

• What does precipitation look like?

• Physical or Chemical Property?

Once all the results are copied on the boardo Develop a flow chart to separate each substance based on

the results of these tests.

What does a flow chart look like?