Quick little question : )
how many possible isomers of heptane are there? what are the structural differences between these isomers?

Nine isomers  

Step-by-step explanation:

There are nine isomers of heptane.

The chain lengths vary from four to nine carbon atoms.

The number of substituents on the main chain, their locations on the chain, and their identities are different in each isomer.

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

: )

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.