Question

define combustions reaction...properly

Answer 1

When a substance is burnt in air and it emits out a large amount of heat is called combustion reactions

Answer 2

Answer:

Combustion is the scientific word for burning. In a combustion reaction, a substance reacts with oxygen from the air. Combustion reactions happen at high temperatures, and transfer energy to the surroundings as light and heat.  Methane reacts with oxygen from the air and produces either a hot blue or an orange flame.