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.
Corrosion is a natural process. Metals donât like being metals, they prefer remaining as ores. In the process of converting ores into metals, energy is added. in the form of heat, this places the metal into a high-energy. state. It is this energy that is given off from the metal, as the metal is. returning to an ore, lower-energy state, is what we call. corrosion. Steel - Rust to Rust.