Write down the chemical equations of: a) how propene becomes propane
b) etane becomes chloretane
c) pentene becomes pentane​

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.

girl imma just put my comment here because i need a couple point okurrttt

there are two significant figures.