Let's look at the chemical equation again: N2 + 3H2 2NH3
This time, you'll use a different method to count the atoms. Multiply the coefficient by the subscript for each atom. For
example, to find the number of hydrogen atoms in 3H2, multiply 3 by 2. Use the following table to organize your work. Fill
in the number of atoms in the reactants and products in the table.

the volume increases

explanation:

0.07 g/cm³

1.37 g/cm³

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.