Chemical equation is balanced when ?
A chemical(also called a “balance equation” or “reaction equation”) translates, on paper, the rearrangements of that occur during a .
The balance equation of a chemical reaction
In a chemical equation, atoms andare represented by their chemical formula. The , meanwhile, is symbolized by an arrow. The of the reaction are located on the left of this arrow and the products on the right.
When the– as between and , which give and vice versa – the two terms of the equation are separated by a double arrow.
Examples of chemical equations
- 2 Na + Cl 2 → 2 NaCl
- 2 H 2 + O 2 → 2 H 2 O
- C + O 2 → CO 2
- CH 4 + 2 O 2 → CO 2 + 2H 2 O
Balancing a chemical equation
Sometimes it is necessary to use several molecules of the same nature for a reaction to be initiated. The number of molecules is then indicated in front of its chemical formula. This number of molecules is called the “stoichiometric coefficient”.
According to the law of conservation of the, the number of reagents of each must be equal to the number of products of each species. In chemists’ jargon, it is said that a chemical equation must be balanced.