6.2 Mixtures

6.2 Mixtures

Mix it up!

What is a mixture?

• A mixture consists of two or more elements or compounds mixed physically.

• Can you name a few?

Mixture of solid and liquids

Some drinks like cocktail and "air batu campur" are made up of combinations of solids and liquid mixture

Methods to Separate Mixtures

• As the mixture is formed physically, it can be separated physically too.

• I.E. Shawarma, made up of vegetables, pita bread and meat, it can be separated physically

Separation Methods

To be or not to be

Filtration

• Filtration is a method used to separate INSOLUBLE solid from a mixture of solids and liquids

• Can you name a few?

Distillation

• Distillation is the method used to separate a completely miscible liquid-liquid mixture that have different boiling points.

• How does it work? Can you explain?

Separation Using Magnet

• If you hold a magnet close to a box of iron nails mixed with sand, what would happen?

• Iron nails are metals and magnetic substance.

• Hence, they will be attracted to the magnet.

  But, sand is not a magnetic substance.

Sedimentation

• Two layers are formed in which the water is at the upper layer and the sand is deposited at the base of the beaker.

• This is because the sand is not soluble in

  water and has a higher density.

• Therefore, the sedimentation method is used to separate

  a liquid and insoluble solid mixture.

Floatation method

• Floatation method can be used to separate soluble and insoluble materials in water.

• For example, oil has a lower density than water.

• Therefore, oil will float on the water surface. A separating funnel can be used to separate the oil and water.

Chromatography

• Separation methods like filtration and distillation need a large amount of mixture to separate the substances.

• One of the methods is by using

  chromatography.

• This method is usually used to check document fraud by separating the colours from the ink used.

Multiple Choice

Which of the following is NOT TRUE about mixture?

• Formation of mixture requires heat

• Mixture can be separated through physical methods

• Mixture can be formed in any ratio

• Chemical properties of the product formed are not the same as the mixing substances

Multiple Choice

The following diagram shows the method of separating mixture from its component. Which mixture can be separated through the method mentioned?

• Mixture of water and salt

• Mixture of oil and water

• Mixture of sand and salt

• Mixture of iron filings and sulphur

Multiple Choice

What is the separating techniques that can be used to separate the colour of the ink pen?

• Filtration

• Sedimentation

• Floatation

• Chromatography

Poll

Do you understand today's lesson?

• Yes

• No

• A little bit

• I'm sorry, but I may be lost somewhere. Find me

Open Ended

What have you learnt today?

Multiple Choice

Which of the following is NOT TRUE about mixture?

• Formation of mixture requires heat

• Mixture can be separated through physical methods

• Mixture can be formed in any ratio

• Chemical properties of the product formed are not the same as the mixing substances