You are given a sentence and your task is to generate another sentence that supports the given input.

[Q]: Isomers (chemistry) Isomers, are two or more chemical compounds that have the same number of each kind of atom, but differ in the way the atoms are arranged.
[A]: Alkenes with the same atoms but different shapes are called isomers.


[Q]: Reversible reactions are symbolized in chemical equations by a double-headed arrow, but the standard remains to call the materials on the left the reactants and the materials on the right the products.
[A]: Reversible reactions are indicated by opposite-headed kinds of arrows.


[Q]: An example of this type of crystal is sodium chloride (NaCl).
[A]:
Compounds like sodium chloride form structures called crystals.


