Chemicals symbols of elements are writed after the rules of IUPAC; see a list at the link below.
The correct chemical symbol of magnesium is Mg.
The correct way to write the chemical name of carbon dioxide is "carbon dioxide" or "CO2".
The symbol of the element is used as an abbreviation for its name.
Because to write chemical equations you need a short way of referring to an element.
IUPAC (International Union for Pure and Applied Chemistry) has rules for writing chemical symbols and formulas. They are valid in all languages.For compounds search in a library Nomenclature of inorganic compounds and Nomenclature of organic compounds, with the text adapted to your language, if necessary.See the links below.
For correction purposes the correct way to write this is H2O and it is the chemical formula for water.
The correct way to write a chemical equation is: Reactants -> Products. This means that the reactants on the left side of the arrow are converted into products on the right side. The double arrow symbol <=> can be used to indicate that the reaction can proceed in both directions to reach an equilibrium.
Chemical symbol is code for a chemical element. Chemical formula is way of expressing information.
The correct way to write it is ' 120 '.The correct way to say it is "One hundred twenty".
The correct way to write fireplace is as one word - "fireplace."
reactants -----> products is correct
the correct way is to simply write 3 and a colon following it then write down 2 zeroes followed by hrs