HV3 C1 Materials and substances (2)

• Scheikunde
• Middelbare school
• vwo
• Leerjaar 3

H1 Materials and 

substances

Lesson 2: Recap Mixtures and Separation Methods

NOVA 3HV

Class Goals Today

• Review the particle model
• Review pure substances and mixtures
• Review separation methods
• Class Quiz - What do you remember?

The particle model

• Macro level properties depend on micro level molecules
• Phase transitions like melting and boiling originate from moving molecules

Pure substances and mixtures

• What is a pure substance?
• Mixtures; heterogeneous, homogeneous 
• Solutions, suspensions, emulsions
• Composition, mass percentage calculations

Calculations

Brass is a mixture of copper and zinc. 

400 g of brass contains 236 g of copper.

The masspercent of copper in messing is ...........%

Stainless steel contains 8 masspercent nickel and 18% chromium. How much nickel  is present in a slab of steel weighing 50 kg.

 

In deze plaat zit 

 kg nikkel.

One more...

Seawater contains 3% salt. How much seawater (in kg) do I need to obtain 12 kg of salt?

Separation Methods

• Filtration
• Sedimentation and decanting
• Centrifugation
• Evaporation
• Distillation
• Extraction
• Adsorption

Quiz !!!

A liquid with small pieces of a solid substance floating in it. Each granule consists of a huge number of molecules.

Materials of natural origin such as bone, wood and stone.

The mass of a material or substance per unit volume.

This substance contains several pure substances mixed together and so there are several types of molecules.

How well substances and materials conduct heat or electricity.

Separation method based on differences in solubility in which you dissolve substances from a mixture into the xxxxx agent.

What tells you the ratios in which substances are present in a mixture.

A mix of materials used to achieve better material properties.

Separation method based on differences in density.

Separation method based on differences in particle size.

A substance that only contains a single type of molecule at the micro level.

This mixture is made up entirely of separate molecules.

Absorbing water or soluble in water.

A liquid in which another substance is present. That other substance has been broken up into individual molecules.

The state of matter for a substance: solid, liquid or gaseous.