For example, 2 + 3 + 5 = 10 is an equation. Chemistry A written representation of a chemical reaction, in which the symbols and amounts of the reactants are separated from those of the products by an equal sign, arrow, or a set of opposing arrows. For example, Ca(OH) 2 + H 2 SO 4 = CaSO 4 + 2H 2 O, is an equation.
an element is a pure substance that is made from a single type of atom elements are the building blocks for all the rest of the matter in the world examples of elements include iron oxygen hydrogen gold and helium
An element is a substance made from only one type of atom. For example, Oxygen is an element made up of ONLY oxygen atoms. To understand this better, let us see the how atoms behave. Every element is made up of atoms. Atoms are the smallest piece that can exist in an element.