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Mystery Mixtures

Part 2

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  • Visual Inspection
  • Reaction with water
  • Solubility in water
  • pH
  • Reaction with iodine
  • Reaction with acetic acid

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Powder Tests

Aleksandra Shutova | Dreamstime.com

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Let’s review the data.

What do these observations tell us?

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Powder Data

Aleksandra Shutova | Dreamstime.com

How could we use this information to identify unknown substances?

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What if the unknown substances were mixtures?

Could we still use our data?

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Mystery Mixtures

Aleksandra Shutova | Dreamstime.com

Why or why not? (Hint…. What do you know about mixtures????)

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In trying to clean up, the powders you tested got combined. Can you figure out what each mixture is made of?

  • There are 5 mystery mixtures.
  • Each contains 2 powders mixed together.
  • How will you figure out what each is made from?

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Challenge

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Flour + sodium bicarbonate (baking soda)

Flour + sodium carbonate (washing soda)

Flour + baking powder

Cornstarch + salt

Sugar + sodium bicarbonate (baking soda)

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Challenge - Mixtures

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  • Test your mixture by following your instructions. Use your existing results.
  • Use the data to solve the mystery.

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Time to Test

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In 3-4 complete sentences explain which 2 powders your mystery mixture is made from. Be sure to explain how you know this. You must reference the data you collected.

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Content Connection

Sentence Starter:

I think Mystery Powder ________ is made from …….. . My main reasons for thinking this are …… and …….. I know this because my data chart says…

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