Answer: 
Explanation
Combustion is a chemical reaction in which hydrocarbons are burnt in the presence of oxygen to give carbon dioxide and water.
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The balanced combustion reaction for butane is,:

Answer:
the most useful hydrocarbon is fuel.
Explanation:
some examples like: natural gases,coal,diesel fuel, kerosene etc.
Answer:
They are big rocks that fly through space and are made of most commonly chondrite. When they collide, they collide with such force that they create craters on places like the moon.
Answer:
salamat sapoints po lods thaks
Answer:
Because it went through a chemical change which changes its atomic form