what are the significance of chemical formulae
Answers
Their advantages are as follows:
1)saves time
2)Easy to understand
3)provides more details like evolution of heat etc.
A compound is a substance made up of a definite proportion of two or more elements. A chemical formula tells us the number of atoms of each element in a compound. It contains the symbols of the atoms of the elements present in the compound as well as how many there are for each element in the form of subscripts.
Compounds and Chemical Formulas
Each chemical substance has a specific chemical composition, so these chemical substances have their own chemical formula. Let's take a look at the chemical formula of glucose: there are 12 carbon (C) atoms, 22 hydrogen (H) atoms and 11 oxygen (O) atoms.
There are different types of chemical formulas and each type gives us different information about a chemical substance. The different types of chemical formulas include: molecular, empirical, structural and condensed structural formulas. We'll discuss each of these different types as well as go over a few examples.
Molecular Formula
The molecular formula, sometimes known as the true formula, tells us the actual number of the different elements in one molecule of a compound. In a molecular formula, each element is written as their symbols in the periodic table, and the number of atoms for each element is shown by the subscript (the small number to the lower right of the element). Here are some examples of molecular formulas:
Molecular Formula
If we look at butane, we see it has 4 carbon (C) atoms and 10 hydrogen (H) atoms.
Empirical Formula
The word empirical is defined as something that is verified by observation. In chemistry, we verify facts by performing experiments. So, the empirical formula is defined as the simplest ratio of whole numbers of elements that make up a compound, and this type of formula is derived from experimental data.
Just like how we simplify fractions in math class, in chemistry we can simplify formulas as well. In this case, let's look at the molecular formula of glucose:
How to Get the Empirical Formula
While the molecular formula gives us the actual number of atoms of each element in a molecule, the empirical formula gives us the simplest ratio and not the actual number of atoms of an element. Here are some examples of empirical formulas derived from molecular formulas:
Empirical Formula
Sometimes, there are molecular formulas that are already at their simplest ratio which means they cannot be further reduced. In these cases, the molecular formula is the same as the empirical formula which can be seen with these examples.
Empirical and Molecular Formulas Are The Same
In Sucrose, the subscripts 12, 22 and 11 do not have a greatest common factor, so they cannot be further reduced. The same goes with ethanol.
Structural Formula
When we simply write the molecular formula, we do not know how the atoms are arranged or which atoms are bonded to each other. The structural formula shows both the actual number of atoms of elements in a compound, how the atoms are arranged and which atoms are bonded to one another.
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