Teks 5 5c
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TEKS 5.5C. The student knows tht matter has measurable physical properties and those properties determine how matter is classified, changed, and used. The student is expected to (C) demonstrate that some mixtures maintain physical properties of their ingredients such as iron filings and sand.

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TEKS 5.5C

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Teks 5 5c

TEKS 5.5C

The student knows tht matter has measurable physical properties and those properties determine how matter is classified, changed, and used. The student is expected to

(C) demonstrate that some mixtures maintain physical properties of their ingredients such as iron filings and sand.


Teks 5 5d

TEKS 5.5D

The student knows tht matter has measurable physical properties and those properties determine how matter is classified, changed, and used. The student is expected to

(D) Identify changes that can occur in the physical properties of the ingredients of solutions such as dissolving salt in water or adding lemon juice to water.


What are some physical properties of matter

Color

Texture

Odor

Conducts heat

Conducts electricity

Magnetic

Floats or sinks

Solubility

Boiling point

Melting point

Mass

What are some physical properties of matter?


Mixtures

Mixtures

  • Form when two or more substances combine

  • Keep their physical properties

  • Can be separated by their physical properties

  • Do not form a new substance


Salad is an example of a mixture

Salad is an example of a mixture

  • The lettuce and vegetables do not change when mixed


Is cereal a mixture

Is cereal a mixture?

Yes…the properties of the substances do not change.

You can still see the bananas, cereal, and milk.


Is cake a mixture

Is cake a mixture?

No…the properties of the substances change.

The eggs, flour, and sugar change when the cake is mixed and baked.


Substances in a mixture can be separated by their physical properties

Substances in a mixture can be separated by their physical properties…

  • Milk and cereal can be separated by pouring the mixture through a strainer.


Teks 5 5c

The cereal would be trapped in the strainer and the milk would pass through.


Question

QUESTION:

  • How could you separate a mixture of sand and sawdust?


Answer

ANSWER:

  • You can separate the sand from the sawdust by adding water. The sand will sink and the sawdust will float.

Sawdust

Water

Sand


Question1

QUESTION:

  • Which scientific tool could you use to separate a mixture of iron filings and sand?


Answer1

ANSWER:

  • You can separate the iron filings from the sand by using a magnet.

Iron filings


Solutions are a special kind of mixture

Solutions are a special kind of mixture

  • One of the substances

    dissolves in another

  • The substance spreads out evenly

  • Solutions may be clear or colored


Teks 5 5c

You can make a solution when you stir sugar into water. The sugar dissolves and the water remains clear.


Do all substances dissolve

Do all substances dissolve?

No…if you mix sand with water, the sand does not dissolve but settles on the bottom of the glass.

Sand + water


All solutions are mixtures but not all mixtures are solutions

All solutions are mixtures but not all mixtures are solutions

  • Sugar + Water = ?

    Mixture and a solution

  • Sand + Water = ?

    Mixture but not a solution


Other examples of solutions

Other examples of solutions:

  • Soda = Gas + Liquid

  • Jewelry = Solid + Solid

  • Air = Gas + Gas


Solutions can be separated

Solutions can be separated

  • Most solutions can be separated by evaporation.

  • To separate a saltwater solution, let the water evaporate.

  • Once the water is gone, the salt will be left.


Challenge

Challenge

  • You are given a mixture of salt, sand, and gravel. Design a plan to separate this mixture? What tools would you use? List your steps in order.


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