What conditions are necessary for the reaction of magnesium and water?

Magnesium can react with hot water. The phenomenon is that the mass of magnesium is constantly decreasing and there are some (small) bubbles attached to the wall of the beaker, while iron can react with water vapor under high temperature conditions. to generate ferric oxide and hydrogen, if the silver-white iron powder turns into black powder! ! ! No

Is it dangerous if the magnesium block reacts with water (hot and cold water)? I would like to purchase a flint and steel magnesium block. I heard that it will release heat after the reaction. how hot will it be?

Magnesium reacts with water.

It will react very slowly with cold water

It will react faster with hot water (above 80℃), and you can see the obvious phenomenon gas generation

Reacts with water vapor at high temperatures to generate MgO and H2

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Magnesium generally does not react with water because there is a MgO oxide film on its surface. But you need to buy magnesium block flint. This type of flint typically relies on friction to generate sparks and ignite objects. After friction, the oxide film on the surface of magnesium will be erased at this time. hot water There may then be a danger. But if you leave it in the air for un some time, an oxide film will regenerate on its surface, which will be relatively safer. However, I still hope you don't put it in water to avoid unnecessary danger. Magnesium blocks generally don't react with cold water, but magnesium powder can. Therefore, you should be careful when using magnesium and alkali metals such as sodium and potassium to avoid harm to yourself and others.