The First Molecule

Generally speaking, molecules are the basic elements of ‘soft’ matter, water, trees, animals, the atmosphere and are called organic molecules to emphasise the point.
‘Hard’ matter, rocks, metals, gems, diamonds, glass and salts are also made of atoms of course, but the atoms are chemically bonded in a different way so they have no identifiable molecules.

The Big Bang Explained. Sort of.

Perhaps the greatest understatement, serenely floating around in the nothingness before space was invented, is the term ‘Big Bang’. Nothing comes close to describing what happened in that first second, not atomic weapons, not exploding stars, not even supernovae.
If we cherish our understatements a little longer, it was hot. Not hot like anything that could be formed on a planet, not hot like the sun which by comparison is like standing next to the air conditioning on a coolish day, but really, really hot. So hot that nothing existed, not even sub-atomic particles and everything that was to come, the stars, the planets, the universe itself was packed into a space so small, by normal definition it did not even exist.
What triggered the blast may not be fully established yet, we have some competing hypotheses to work with, however it is fairly certain science will eventually create methods for testing so we can settle the matter.
What we do know is what happened in the time slot just after the ‘pop’ but like everything else on the subject, the time slot is impossibly short, far shorter than anything we mere humans can understand.