Soldering and the use of tin and lead solder: Is it okay for students to do soldering using the tin/lead solder?

Soldering and the use of tin and lead solder: Is it okay for students to do soldering using the tin/lead solder?
Disposal of potassium permanganate and glycerol reaction: How do I safely dispose of the products of the exothermic reaction between potassium permanganate and glycerol conducted in a mortar and pe
Whoosh bottle: Is using isopropanol as a fuel safer than using ethanol or methanol?
Precipitation reactions: I am looking for precipitate reactions that have the least impact on the environment but are also dramatic. Do you have any suggestions?
Microscale Chemistry: Can you provide some information on microscale chemistry please?
Biology Depth Studies: Can you suggest ideas for (NSW) Depth Studies in biology?
Acetone and polystyrene foam: Is it suitable and saf
Biodiesel: Do you have a method or advice that you can recommend for making biodiesel? I am concerned about the safety and waste disposal aspects.
Hydrogen peroxide storage: I have stored H2O2 in the fridge in the Chem Prep room for years but recently I have been part of discussions that say this should never be the case
Bacteria in yoghurt: Are yoghurt strains of bacteria suitable for use in schools? Are they safe to use in the biology practical “What causes Yogurtness”?