Question

If a reaction occurs only when heated,
......................is placed above the arrow
showing the direction of the reaction.
​

Answer 1

Answer:

∆ is placed above the arrow

Explanation:

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Answer 2

Haeat is written abovee the arrow.

Explanation:

when we are providing heat it is a thermal decomposition reaction and as well as endothermic reaction. So heat is written over the arrow.

If it is done using electricity we write electricity.

Reaction known as electrolysis.

If it is done using sunlight we write sunlight.

Reaction is known as photon decomposition.

Hope it is clear ☺☺☺