Read the summary and the most important questions on Polaris chemistry 3 vwo

• 1 Substances

• 1.1 Chemistry and practicals

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• Safety rules when doing an experiment

  You must always wear safety glasses and a lab coat, you must also  have your hair tied

• What does a fume cupboard have as function

  Dangerous fumes are extracted so you cannot inhale them

• What do a fire blanket and fire extinguisher do

  They put fire out if someone cathed fire on their clothes

• What do you have to do when you come in contact with corrosive or toxic substances

  You have to wash them away with the emergency shower

• What do you have to do when you get a corrosive or toxic substance in your eyes

  You have to use the safety eye wash

• 1.3 Seperating mixtures 1

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• How can you identify a homogenous mixture

  Every molecule of one substance is surrounded by molecules of the other substance

• How can you identify a heterogenous mixture

  There are seperate groups of molecules of at least one of the substances in the mixture

• 1.5 Calculating with mixtures

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• How is the concentration expressed

  Grams of dissolved substance per litre or mililitre of solvent

• Calculation of the volume/ mass percentage

  Volume or mass of substance/ volume or mass of mixture* 100%

• Threshold limit values

  Indicates the maximum amount of a substance per m3 of air in a room without endangering health