What is the correct structure for 4-(1-methylcyclohexyl) -2-butanone? 
Definitions:
Phase Change
A transition among the basic states of matter: solid, liquid, and gas, involving energy changes without altering the chemical composition of a substance.
Half-life
The time required for half the amount of a particular substance, such as a radioactive element or drug, to undergo a process of decay or elimination.
Isotope
Variants of a particular chemical element which differ in neutron number, and consequently in nucleon number.
Energy
The capacity to do work or produce change, existing in various forms such as kinetic, thermal, electrical, and chemical.
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