Examples of pure substances include tin,sulfur,diamond, water, pure, sugar (sucrose), table salt (sodium chloride) and baking soda (sodium bicarbonate)..... All elements are pure substance. Water, sugar, salt and baking soda are pure substance which are chemical compounds.
Elements, Mixtures and Compounds. Chemistry is the study of physical matter, which is classified in many ways,such as state matter (gas,liquid or solid), chemical form (element, mixture, or compound),chemical structure (atoms of molecules,etc.) and so on.
Examples of elements include oxygen, hydrogen, sodium,chlorine,lead,iron. Examples of compounds include water ( or hydrogen oxide ) H2O ; and Sodium Chlorine , NaCl. H is the symbol for hydrogen , the number 2 as used here means there are 2 atoms of the element hydrogen in every molecule of the compound water.
Compound is a thing that is composed of two or more separate elements; a mixture.
There are many types of compound, like carbon dioxide (carbon and oxygen), common salt (sodium, chlorine), marble ( calcium, carbon, oxygen), copper (II) sulphate (copper, sulfur, oxygen) and hydrogen chloride (chlorine and hydrogen). Compound is made up of two or more elements. Examples include water.