The positively charged hydrogen ions are attracted to the anode, while the negatively charged oxygen ions are attracted to the cathode.
The electrolysis of water is an example of a chemical change that involves the breaking of covalent bonds by using electrical energy. There are five main categories of chemical change: In this example, a chemical change occurred through the process of electrolysis, as shown in the illustration below: This would no longer represent a physical change, but a chemical change, because the bond between the elemental constituents is broken. On the other hand, if a direct electrical current (DC) was passed through the water using electrodes, oxygen gas and hydrogen gas would be liberated. Even though the molecules switched positions and some molecular bonds were broken, the chemical bonds per molecule were maintained. The change doesn’t affect the fact that the substance is still water, with one hydrogen and two oxygen atoms per molecule. The bonds between elements or functional groups in a compound may either break or form new ones with other elements or functional groups.įor example, ice melting into water is a physical change because it only involves water changing phase. What is the Difference Between Physical and Chemical Change?Ī clear distinction between physical changes and chemical changes is the rearrangement of elemental constituents. What is the Difference Between Physical and Chemical Change?.
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