Mixtures

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Suppose you had a mixture of iron nails, salt and water…

How would you separate this mixture completely?

Based on which physical properties would you base your method on?

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Separating Mixtures

How would you separate the components in tap water?

Distillation

A liquid is boiled to produce vapor that is then condensed again to a liquid

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Separating Mixtures

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Mixtures

Sample problem

How can a mixture of iron fillings and aluminum fillings be separated?

1.-Analyze: Plan a problem solving strategy

List the properties of iron and aluminum and look for something that would be useful in separating the mixture

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Mixtures

Iron:

Metal

Grayish

Not soluble in water

Attracted to a magnet

Aluminum:

Metal

Grayish

Not soluble in water

Not attracted to magnets

2.- Solve: Apply the problem-solving strategy.

Make use of a property that differentiates the metals; use a magnet to attract the iron fillings.

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Mixtures

3.-Evaluate: Does the result make sense?

Because the magnet attracts iron but not aluminum filings, the iron would be removed while the aluminum would be left behind.

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Practice Problems

What physical properties could be used to separate iron filings from salt?

Which of the following are homogenous? heterogenous?

1.-Spaghetti sauce 4.-Cough syrup

2.-Glass 5.-Mixture of nitrogen gas

3.-Muddy Water and helium gas