Metal Reactivity Investigation
Ever wondered why some metals fizz more violently in acid than others? This experiment sorts metals by how reactive they are using a simple temperature test.
You'll measure equal volumes of hydrochloric acid in polystyrene cups, record the starting temperature, then add the same mass of different metals one at a time. The key is keeping everything consistent - same acid concentration, same metal mass, same time period. Stir the mixture and measure the final temperature after a set time.
The most reactive metal produces the biggest temperature change because it releases more energy during the reaction. This heat release is your clue to ranking the metals from most to least reactive.
Top Tip: Always use the same physical state of metal (powder vs chunks) - surface area massively affects reaction speed!
Making Salts from Metal Oxides
Creating pure salt crystals from acids and metal oxides is surprisingly satisfying once you nail the technique.
Warm your acid first, then gradually add metal oxide until you have excess solid remaining - this ensures all the acid reacts. Filter out the leftover metal oxide, and you'll have a clear filtrate containing your dissolved salt.
Gentle heating using a water bath partially evaporates the water, concentrating your solution. Leave it to cool naturally, and beautiful crystals will form as the salt comes out of solution.
Watch Out: Never heat too quickly or you'll get powder instead of proper crystals!
