First of all, water is a chemical. So are salt and alcohol, which do mix with water. Some oils (chemicals or mixtures of chemicals) do not mix with water.
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Test tubes are used in laboratories to store, to mix or to change the heat of chemicals.
you die
We need test tubes.
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It all depends on what the chemicals are.If you mix sucrose and water, you'll get sugar syrup.If you mix sodium hypochlorite and ammonia, then add it to anhydrous ammonia, you'll theoretically get hydrazine, which is a rocket fuel. In reality, if you do this without being set up for it you'll get a very devastating explosion so don't do this.
Buy chemicals and mix...
Flat bottomed flask is used to hold different types of chemicals and mix them. This also used to avoid liquid from spilling.
Mustard gas is a deadly mix of chemicals that form a gas that goes into your lungs and literally burns you inside out. It was used in the trenches during ww1 but it was never used after that
test tubes, flasks, beakers, graduated cylinders
when the two chemicals mix together