Question

in the beginning of an experiment you have 23 atoms. how many atoms are you expecting to have at the end of the experiment

Answer 1

The number of atoms at the end of the experiment will be 23 atoms.

Explanation:

In a chemical reaction, the number of atoms presents as reactants will react with each other and bond differently to form new products. The same atoms that were present at the beginning of a reaction will be present at the end of the reaction as well. No new atoms will be created and no atoms can be destroyed.

The total number of atoms of each element in the reactants will be equal to the total number of atoms of each element in the products.

Example for chemical reactions:

Zn + 2HCl          --->         ZnCl2 + H2

 1 + 4 = 5 atoms               3+2 = 5 atoms

One zinc, 2 hydrogen and 2 chlorine atoms on both sides of the equation.

3Ca(OH)2 + 2H3PO4 ---> Ca3(PO4)2 + 6H2O

 15+16 = 31 atoms                13+18 = 31 atoms

3 calcium, 2 Phosphorus, 14 oxygen and 12 hydrogen atoms on both sides of the equation.

So if the experiment began with 23 atoms, the number of atoms at the end of the experiment will also be 23 atoms.