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Chemical formula (Charges of ions (group 2 (2+), group 3 (3+), group 1…
Chemical formula
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Ionic and covalent
Covalent
Covalent compounds are usually made from non-metal elements which are joined by bonds where electrons are shared.
Covalent compounds do not conduct electricity at all.
Ionic
Ionic compounds are compounds made of charged particles (ions). The positive ions are formed by metals having lost one or more electrons. The negative ions are formed by non-metals gaining one or more extra electrons.
Ionic compounds conduct electricity when molten or in aqueous solution.
Conservation of mass
Mass is never lost or gained in chemical reactions. We say that mass is always conserved. In other words, the total mass of products at the end of the reaction is equal to the total mass of the reactants at the beginning.
Relative formula mass
To find the relative formula mass (Mr) of a compound, you just add together the Ar values for all the atoms in its formula.