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UNIT 3 LESSON 10: SEPARATING MIXTURES

Grab your TERIFFIC Science Notebook and your student guide.

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HETEROGENEOUS MIXTURES Has components spread unevenly

throughout the mixture.

Is not uniform

The parts in the mixture can be separated from one another

Prefix Hetero – Means Different

HOMOGENEOUS MIXTURE

When all parts of a mixture have the same amount of each ingredient

Is uniform

The parts in the mixture can not be separated

Prefix Homo – Means Same/identical

HETEROGENEOUS? HOMOGENEOUS?

OBJECTIVES

Students will be able to… Interpret diagrams with examples

of these methods of forming and separating mixtures. Explain how mixtures can be

separated by physical methods, such as mixing, magnetic attraction, evaporation, filtration, distillation, chromatography, and settling.

MIXTURES CHALLENGE • Put the pictures (on the next page) in the box

where they correctly belong.

• You have to use your knowledge of compound, element and mixture in order to correctly place the picture!

Elements

Compounds

Mixtures

Some metals (iron, nickel

and cobalt) can be separated from a mixtures by using a magnet.

The metal is attracted to the magnet and gets pulled out!

SEPARATING A MIXTURE WITH A MAGNET

Review Check: What type of mixture is the sand and iron filiing? Homogeneous or Heterogeneous

HOW WOULD YOU SEPARATE A SAND AND IRON FILINGS MIXTURE?

You could separate the glitter and water with a filter!

You could also let the glitter float to the top and skim them off the water with a spoon.

Filtering is one method of physically separating substances without a chemical reaction.

SEPARATING A MIXTURE WITH A FILTER

Review Check: What type of mixture is sand and water? Homogeneous or Heterogeneous

HOW WOULD YOU SEPARATE GLITTER AND WATER?

Evaporating the water out of mixture will leave all other particles behind.

In a mixture of salt and water, you could separate the mixture by evaporating the water out and the salt will be left!

HOW COULD YOU SEPARATE A MIXTURE OF SALT WATER?

Separating a Mixture by Evaporation

Review Check: What type of mixture is salt water? Homogeneous or Heterogeneous

Distillation: physically separating a solution of a solid and liquid by boiling off the liquid.

WHAT IS DISTILLATION?

How could this process be helpful?

Saltwater can be distilled, resulting in pure water and salt (separated). This way you could have clean, drinkable water!

Distil lation can be used to separate crude oil into its component parts, l ike gasoline, kerosene and diesel.

SEPARATING BY DISTILLATION

Distil lation can be used to separate other l iquids l ike water and rubbing alcohol.

Different liquids have dif ferent degrees of volatility (tendency to evaporate at a given temperature).

Each liquid would evaporate at a dif ferent temperature.

Example: rubbing alcohol boils at 82°C and water boils at 100°C

Density

How would you separate sawdust and sand?

Put the mixture into water and the sawdust will float to the top and the sand will sink to the bottom.

Most dense sinks, less dense floats!

MORE WAYS TO SEPARATE MIXTURES

Chromatography

It is the separation of substances in a mixture by dif ferences in their attraction to a substance over which they are passed.

How does it work? A mixture of pigments are place

on filter paper. The end of the filter paper is

place in a solvent like alcohol. As the solvent moves up the

paper and hits the pigment it separates each pigment (color).

PRACTICE! How would you separate the following mixtures?

A Salad:

Pepper and Water:

Iron Filings and Salt:

PRACTICE! How would you separate the following mixtures?

A black Marker:

Sand and Salt:

Click on the link below and answer the questions. Remember to try your best! This gives us a quick snapshot of how you are doing with the lessons taught today It also is how I am taking attendance!

When you are finished submitting the Exit Ticket, you may leave

class Go and take Unit 3 Lesson 10 Separating Mixtures assessment in the OLS. Have a wonderful day!

If you have questions raise your hand!

EXIT TICKET!