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 that can't be broken down into another substance. Elements are composed of only one type of atom. For example gold is made up of only gold atoms. Comâ¦pounds are substances made up of more than two elements. For example water(H2O) is made up of the elements hydrogen and oxygen.