They are called coefficients. They represent the number of moles of that element required for the reaction to be completed as written in relation to the number of moles for the other elements. They can also be considered the number of molecules required (different from moles), but most combustion reactions include 1/2 as a coefficient for O2. So don't get confused.
Coefficients
we should balance a chemical equation so that both the sides of the elements and compounds are equal.
KCl is the chemical formula unit of potassium chloride not a chemical equation.
Evaporation is not a chemical change and so there is no chemical equation.
from a balanced chemical equation
A chemical equation written in symbols is sometimes called a balance equation, because the numbers of each kind of atom have to balance on both sides. If it's written in words it's called a word equation.
we should balance a chemical equation so that both the sides of the elements and compounds are equal.
Jean Beguin was the first iatrochemist to balance a chemical equation.
balance chemical equation, change only the coefficients of the formulas.
False. Subscript cannot be change to balance chemical equations. Only coefficients can be added to balance chemical equation.
The molar mass is not needed to balance a chemical reaction.You need to know the chemical formulas of reactants, the possible formulas of products, valences of elements and ions, general principles of chemical reactions, some chemical and physical properties of substances involved in the reaction.
false
KCl is the chemical formula unit of potassium chloride not a chemical equation.
Evaporation is not a chemical change and so there is no chemical equation.
from a balanced chemical equation
In the same way as you made sure that the chemical elements balanced on both sides of a chemical reaction equation, so also the physical dimensions balance.
balance your chemical reaction equation then calculate moles, then calculate weight.
PbCl2 is the molecular formula (not chemical equation) of lead(II) chloride.