Matter and energy review

Select the pure substances

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• 
• 
• 

In a homogeneous mixture...

• we see the various substances because they are NOT combined

• we cannot see the different substances because they are closely combined

Choose the heterogeneous mixtures

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• 
• 
• 

Separate the mixture

• Magenitc separation

• Distillation

• Decantation

• Evaporation

Irreversible changes are...

• permanent and cannot be reversed

• are temporary and can be reversed

Chose the reversible change

• cut paper

• melting ice

• break a window

There are 3 chemical reactions:

• Combustion, oxidation and preparation

• Conduction, oxidation and fermenzation

• Combustion, oxidation and fermentation

• Conduction, convection and fermentation.

Combustion is a chemical reaction that produces energy in form of light and heat.

• True

• False

Choose examples of fermentation

• making bread

• making yoghurt

• making cheese

• making soup

Circle movements in hot gas and liquids are called convection.

• True

• False