If you heat a boiling tube, and it has a delivery tube submerged in water, then you need to be wary of suck-back. When you stop heating, the contents of the boiling tube cool and the air contracts. This draws water up the delivery tube and into the hot glass boiling tube. Hot glass does not like meeting cold water. If you are lucky/unlucky (delete as applicable) then the following happens.
Questions…
- The video shows someone who has just reacted magnesium with steam. What gas was he collecting over water?
- What compound formed within the boiling tube?
- What would its approximate pH be if it was dissolved in water?
- What happens to the volume of a gas when it is heated?
- What volume does one mole of an ideal gas occupy at standard temperature and pressure (STP)? (Some research required)
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