Which statement describes a chemical reaction?

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

The answer would be 'reactants form products when atoms are rearranged.' (Even though some phase changes, which are physical changes, can fall underneath this, that would be the correct answer mostly applied to chemical reactions.) By the Law of Conservation, No energy or amounts of matter could be created or destroyed, therefore nothing is lost nor gained. Reactants are the items that are technically reacting whilst the product is the outcome. Products don't react.

For cyclohexane compounds drawn in a chair conformation:   -axial bonds are vertical  -equatorial bonds are parallel to two bonds within the ring.  thus, as i assume the chair conformation is drawn:   -the x group is in an axial position, as are the five other vertical bonds.  -three axial bonds are on the top face of the ring  -the other three axial bonds are on the bottom face  the position of the second substituent on each ring carbon is equatorial.  gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other.  drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1.  click this link and watch some academic videos that may you more understand the topic