The chemical equation Al + 3Se -> Al2Se3

1. Detailed information about the Al + 3Se -> Al₂Se₃equation:

This chemical equation describes the reaction between aluminum (Al) and selenium (Se) to form the compound aluminum selenide (Al₂Se₃).

2. Reaction conditions:

This reaction requires high temperatures (above 500 degrees Celsius) to occur and is usually carried out in an oxygen-free gas environment to avoid unwanted reactions with oxygen.

3. Reaction process:

When aluminum and selenium are heated together, aluminum reacts with selenium to form the compound aluminum selenide. This reaction is exothermic, which can be observed by the change in temperature of the mixture.

4. Phenomena that occur:

When the reaction occurs, the mixture of aluminum and selenium will heat up. The mass of the mixture does not change but a new solid substance, aluminum selenide (Al₂Se₃), with a brownish-red or black color will appear, depending on the reaction conditions.