H2 §2 Mixtures part 2

• Natuurkunde / Scheikunde
• Middelbare school
• havo, vwo
• Leerjaar 2

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Today

1. Repeat different types of mixtures
2. Seperation methodes
3. Homework

Pure substances and mixtures

How many types of molecules does a mixture have?

1. 1 type of molecule
2. 2 types of molecules
3. at least 1 type of molecule
4. at least 2 types of molecules

phet.colorado.edu

Solution

• Clear and transparent
• Colourless or coloured
• Mixture solid/liquid with a liquid

Suspension

• Cloudy
• Always coloured or white
• Mixture of a solid and a liquid

A suspension is

1. clear
2. cloudy

Mudwater is a

1. Suspension
2. Solution

Cola is a

1. Suspension
2. Solution

Filtration      

Separating solid from liquid 

This can be done with a suspension

Residue - remains in filter

Filtrate - passes through filter

Extraction

When you want to extract certain substances from something.

Making tea

The colour, aroma, and flavour ingredients dissolve in hot water.

The tea leaves themselves do not dissolve

This is called extraction

How do you remove the tea leaves from your tea at the end?

Solvent/ extractionagent (hot water)

Yellow globules dissolve (fragrance, colour and flavour)

Red globules do not dissolve (tea leaves).

Extractionagent

.

What kind of mixture is the residue and what kind of mixture is the extract?

1. The residue is a solution, so is the extract.
2. The residue is a suspension, so is the extract.
3. The residue is a solution the extract a suspension.
4. The residue is a suspension, the extract a solution.

You can separate a suspension by

1. evaporation
2. extraction
3. filtration

Suspension

Residue

Filtrate

CH2§2: 1t/m7 

Uneven assignments