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 something basic and importantââin chemistry, an element is one of the essential molecules that everything else is made of. If a book's ending carries and element of surprise, it means surprise is an important part of the story's end. One of the earliest meanings of this noun was in reference to any of four substances, earth, air, fire, or water, that were formerly regarded as a basic constituent of the universe.