Because it is flammable substances
A Bunsen burner is not made of pyrex, it's metal. Usually a beaker or flask made out of pyrex glass is heated by the flame from the Bunsen burner.
[object Object]
What_is_the_black_substance_on_the_bottom_of_the_evaporating_dish_after_it_has_been_heated_on_a_bunsen_burner
The evaporating dish would not be harmed if it was heated on a hot plate, but it should be heated on a bunsen burner.
It is to prevent direct contact of the glass with the flame of the Bunsen burner. This lowers the possibility of the glass shattering when being heated Read more: What_is_the_purpose_of_the_wire_gauze_placed_over_a_bunsen_burner
Many salts do not decompose when heated.
the iron ring, the wire mesh over the ring, the beaker or whatever else was being heated. There are special tongs for most types of glassware or porcelain objects that are heated over a Bunsen burner.
A Bunsen burner is not made of pyrex, it's metal. Usually a beaker or flask made out of pyrex glass is heated by the flame from the Bunsen burner.
Many salts do not decompose when heated.
Sodium Carbonate
Sodium Carbonate
[object Object]
A crucible is placed in a pipestem triangle placed on an iron ring while being heated. This supports the crucible while allowing the bottom of the crucible to be directly exposed to the flame of the Bunsen burner. There is no item that is used to distribute heat from a Bunsen burner when heating the bottom of a crucible. The bottom of the crucible is intended to be exposed to the direct flame of the Bunsen burner.
For example stable oxides as aluminium oxide.
Certainly! That's what they're designed for.
Sodium Carbonate
What_is_the_black_substance_on_the_bottom_of_the_evaporating_dish_after_it_has_been_heated_on_a_bunsen_burner