# How matter is conserved during chemical reactions?

May 14, 2018

see below

#### Explanation:

All the atoms you had at first, are conserved in the new state also if arranged in a different way. Also the mass is the same also if may be that using or forming some gases, it can seem no true if you don't use a closed sistem

May 14, 2018

Old question, but still an absolute chemical principle....

#### Explanation:

Chemical reactions conserve TWO quantities: (i) mass; and (ii) charge. And so if you start with $10 \cdot g$ of material in a reaction; at most you are going to have $10 \cdot g$ of material at the end of the chemical reaction; of course you are not even going to get that; losses always occur on handling and yield is diminished.

Natural product chemists, who design and execute syntheses of complex biological molecules, will typically start a synthesis with KILOS of starting material. After a few steps they work with $100 \cdot g$ quantities, and at the end of the synthesis they might work with milligram quantities...and at each step their intermediates must be carefully characterized