Some common mouth problems include. 1  Cold sores - painful sores on the lips and around the mouth, caused by a virus. 2  Canker sores - painful sores in the mouth, caused by bacteria or viruses. 3  Thrush - a yeast infection that causes white patches in your mouth.
-Explain why energy input is necessary to extract a metal from its ore In order to break the chemical bonds in the compounds, energy such as heat or electricity is required to break these bonds and extract the metal. -Identify why there are more metals available for people to use then there were 200 years ago.etal + Oxygen Metal Oxide Metals with a low reactivity such as gold and silver are used in jewellery because of their shiny lustre and the fact that they do not tarnish easily. with a particular emphasis on current developments in the use of metals. This is because the metal tends to want to keep its electrons more.
More reactive metals such as iron are found in ore which through processes can be purified. Some elements are very hard to find as they are unstable in molecular structure. The discovery of all elements (whether found pure or in compound) is summarised in the periodic table. Hope this helps with reactivity of metals.LL. Metals, by their very nature occur naturally. If it is in the periodic table of elements, they occur naturally. Some combine with other metals to form-what is called-ores or oxides, or chlorides. If you are studying chemistry, it is an exciting area to learn how to extract those metals from their ore.