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.
For nearly all metals a chemical reaction is used to extract the metal from its ore. Since chemical reactions are accompanied by either the release or absorption of heat, a form of energy, it can be concluded that for most metals the extraction reactions require the input of considerable amounts of energy (heat).he more common a metal is and the easier it is to extract and produce the. lower the commercial price. Aluminium is the most abundant metal, but is very. reactive and therefore requires large amounts of electricity to extract it from its. ore, Bauxite. Iron on the other hand is cheaper to extract from its ore.