Answer :
Answer:
Explanation: Combustion that results in a flame is very fast and is called burning. Combustion can only occur between gases. Fuels can be solids, liquids or gases. During the chemical reaction that produces fire, fuel is heated to such an extent that (if not already a gas) it releases gases from its surface. Only gases can react in combustion.
The difference in the reaction of a flame to carbon dioxide and reaction of the flame to hydrogen in terms of cause and effect has been explained below.
For a flame to light, it needs the presence of oxygen for a combustion reaction.
Now, for a flame in carbon dioxide; since Carbon (IV) oxide's molecules are heavier than the molecules of air, it means that they push out the oxygen molecules and others in the air and as a result it's now the carbon dioxide gas that will be hovering over the flame directly. Since oxygen which is the primary element for combustion is missing, it means the flame cannot react with it anymore and as such the flame will go off.
Whereas, for a flame in hydrogen; since hydrogen is lighter than air, it means it does not displace the oxygen that is making the flame to burn and as such instead will react with the oxygen to form water and release energy. But when ignited by the flame, it mixes with the air to form an explosion.
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