What would the molecule c₂h₄ be classified as?

alkane

inorganic compound

alkyne

alkene

Alkene.

Explanation:

C₂H₄ is the formula of ethene.

C forms four bonds.

Its structure is: CH₂=CH₂.

The bond between the two carbon atoms is double bond.

When the hydrocarbon contains a double bond, it is classified as an alkene.

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.

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