Iron sulfide however will require a chemical reaction to separate the iron and sulfur (Leong & Aik, 2009).An element cannot be further broken down chemically, while a compound can be broken down into individual components or elements using chemical reactions specific for that compound. For example, heating mercuric oxide, which is a compound, over a Bunsen flame, will result in the decomposition and separation of mercuric oxide into mercury and oxygen. However, mercury and oxygen, which are elements, cannot be further broken down using any chemical means (Leong & Aik, 2009). Therefore, in order to tell whether a given pure compound is an element or a compound, it will be subjected to various separation procedures to determine if it can be broken down further. Its melting and boiling points and other physical and chemical properties will also be noted and compared with those of preexisting elements and compounds for ease of identification.Ionic bond is formed when electrons are transferred from one atom to another. The transfer of electrons results in the formation of a positive and a negative ion that are held together by strong electrostatic attraction. For example, salt (NaCl) is formed when an electron from sodium (Na) is transferred to chlorine (Cl) to form ions (Na+ and Cl- ) that are held together to form salt (NaCl). Covalent bond is formed when an electron pair from the outer shell is shared between two atoms. For instance, Hydrochloric acid (HCl) is formed when an electron from hydrogen (H) and one from chlorine (Cl) is shared together forming a covalent bond (Ramsden, 2001).Because of the ionic nature of their bonds, ionic compounds conduct electricity and thus, they are electrolytes. On the other hand, covalent compounds having covalent bonds are non-electrolytes (Ramsden, 2001).Because of the strong electrostatic attraction between positive and negative ions, ionic bonds are generally very strong, resulting in high melting and boiling points for the compound having these bonds. Covalent bonds generally have low forces of attraction (Ramsden, 2001).Ionic bonds are formed by the transfer of electrons from a donor atom to a recipient atom. Metals at the left side of the periodic table have lesser and loosely held electrons in their outer shell and so, they have a higher tendency to lose electrons, while nonmetals at the right side of the periodic table have higher number of strongly held electrons in their outer shell
Leong, O.H., & Aik, E.A.J. (2009). Chemistry Expression - An Inquiry Approach for O Level Science. Singapore: Panpac Education.
Myers, R. (2003). The Basics of Chemistry. Westport, CT: Greenwood Press.
Ramsden, E. (2001). Chemistry. Cheltenham, TH: Nelson Thornes Publication.
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