Ch of these three gases is most abundant in the atmosphere? which of these three gases is most abundant in the atmosphere? carbon dioxide (co2) nitrous oxide (n2o) methane (ch

Answer is Carbon dioxide.

The given gases are trace gases. Our atmosphere has 0.1% of trace gases. Among those trace gases, carbon dioxide level is highest as 93.49%. Methane has 0.44% and amount of nitrous oxide is 0.07%. But when considering the whole atmosphere nitrogen gas is the most abundant gas as 78% and next is oxygen as 21%.

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.