Some forms of polyethylene are relatively soft, much like paraffin wax. other forms of polyethylene are very hard and rigid. what structural feature accounts for the different properties? the length of the carbon chain substituents added to certain monomers the bonds that connect adjacent monomers the identity of the monomers

The bonds that connect adjacent monomers

Explanation:

The more the bonds that connect the monomers (or the stronger the bonds), the harder the polythene plastic. The fewer the bonds the softer the plastic. The number of bonds is mainly dependent on the amount of branching of the monomers. The more the branching the fewer/weaker the bonds between the monomers.

it also supports my hypothesis. if you rest first you can squeeze the clothespin more times. from the data i collected the average of the eight people concluded exercise makes your muscles more fatigued and less able to squeeze the clothespin compared to resting before squeezing.