chessvilla.blogg.se - Chemistry calculator stoichiometry

CHEMISTRY CALCULATOR STOICHIOMETRY HOW TO

Why can’t the oxygen just be written as a single O instead of O2? Then that would solve the issue. Now if you look closely, the above equation is not balanced. Why? Because the left hand side has two oxygen atoms, but the right hand side only has one.Īt this point you may ask. For example:Īs we learnt above, we know that the chemical formula for magnesium oxide is MgO because magnesium and oxygen both have a valency of 2 which cancels out.

This is a bit more complex because the equation needs to balance.Ī balanced equation means that there are the same number of each type of atom on both sides of the chemical equation. Atoms and compounds are represented by their symbols.

CHEMISTRY CALCULATOR STOICHIOMETRY HOW TO

You need to know how to write both word equations and symbol equations. All chemical reactions can be represented by equations. This skill will be briefly introduced here and developed further throughout the course.

In this case, because the valencies are equal, you must cancel them out.

What is the formula for Aluminium Oxide?.

What is the formula for Magnesium Chloride?.

Take a look at the examples below, you will understand what I mean: So once you know the valencies of the atoms, all you need to do is swap the numbers around and cancel them out if they are equal. This means the valency of an atom will also tell you the charge of its respective ion (i.e. Group 4 can do either.Īlso remember, many atoms will become ions due to the loss or gain of electrons in ionic bonding. Groups 5-7 (non-metals) will GAIN electrons. From this information, you can figure out how many electrons it needs to gain or lose to achieve a full outer shell. The group of the element (on the periodic table) tells you how many electrons there are in the atom’s outer shell.

You can figure out the valency of an atom via the periodic table. The valency is the amount of electrons an atom has to gain or lose in order to achieve a full outer shell.

To figure out the chemical formula of a given compound all you need to know are the valencies of the atoms that make the compound.