You'll need to check the chemical chart on the wall so that you know which bin to put each chemical in. Put one in the wrong bin and it will explode.
Make sure that the claw hand doesn't touch another chemical or the sides of the bin.
Open the claw wide enough so that it has plenty of room to fit around the chemical you want to move, then adjust how close you need to be to the chemical to close the claw around it. Different size chemicals need different adjustments in the distance.
Once you've moved the chemical and you've placed it as far as you can inside the bin, open the claw wide and back out.
You cannot put a chemical back down on the grid once you have picked it up.
Work first with the chemicals that have the most space around them and have a clear route through to their respective bin - that should free up the area for you to get to the other chemicals.
, let us know how you get on.