Examine the equation.

2H2(g) + O2(g) → H2O(l)

Match the equation's components to the appropriate description.

H2O -- product
O2 -- reactant
(g) -- state of matter
→ -- yields

2H2(g) + 2O2(g) → H2O(l)

Explanation:

First balance the know equation.

Then:

2 -Coeffient

O2 and H2 reactants

H2O -product  

→ yields

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.