Importance of Wearing Laboratory Gown/Coat
 If something splashes onto your lab coat or your coat catches on fire – you can easily take the coat off. It is more difficult to remove contaminated clothing.
Importance of Washing Hands After Each Laboratory Period
    To remove the chemicals in your hand.

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Laboratory gown is important so we could protect ourselves while doing some experiment. Protecting ourselves in the chemicals that can spill, especially if the chemical is harmful that you need someone's supervision while doing that experiment. Washing our hands after each laboratory period will avoid us from having allergies from the chemicals we use while doing the experiment.