What would be the first thing you would do if you are burned by a chemical while performing a lab experiment?

The first step is to clean the burned area with cool water. If the chemical is an acid, you apply a base like soap. If it is a base, you clean it with water. if the condition remains the same then take sodium pellet and apply on the burnt area..!!!

Flood the affected area with cool water for at least 20 minutes. While doing so, determine what exact chemical has created the burn and respond accordingly. Also, ask for assistance from your lab consultant right away. 

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Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant.