It is the fifth most abundant element in Earth's crust, and the third most abundant metal, after iron and aluminium. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. The tissues of the oesophagus, stomach or intestines will be coated by the barium sulphate and these tissues will therefore appear on x-rays.Calcium is a chemical element with the symbol Ca and atomic number 20. A patient would be asked to swallow a barium meal which contains barium sulphate.
Barium sulphate can be used in X-rays as it is opaque to x-rays meaning that the rays won’t pass through it.
Xrays are generally used to diagnose problems with bones and as they are hard tissues they come up on x-rays. X-rays usually pass through soft tissues like the digestive system.A slurry is a thin and viscous fluid mixture and it is sprayed onto the flue gases where the sulphur dioxide reacts with it to produce calcium sulfite (a solid waste product). A slurry is made of a combination of calcium oxide or calcium carbonate and water.Both calcium oxide (lime) and calcium carbonate (limestone) are alkaline substances that can be used to remove the acidic sulfur dioxide from flue gases. Powdered Calcium oxide (CaO) or calcium carbonate (CaCO3) can both be used to remove sulfur dioxide.A glue gas is a gas that is released from the chimneys and exhausts of factories that burn fossil fuels. Wet scrubbing is a process used to remove sulphur dioxide from flue gases.Sulfur dioxide is a gas produced when fossil fuels are burnt to generate electricity which contributes to acid rain and must be removed Sulfur dioxide (SO2) is an air pollutant released from the burning of fossil fuels.Some indigestion tablets use magnesium hydroxide an an antacid which means that it is used to neutralise excess stomach acid. Magnesium hydroxide Mg(OH)2 is used in medicine.Calcium hydroxide is also known as slaked lime and it is used to neutralise acidic soils to encourage to growth of plants. Calcium hydroxide Ca(OH)2 is used in agriculture.As group 2 elements are alkaline earth metals, they neutralise acids when they react with them. Compounds of Group 2 elements are used to neutralise acidic conditions.Uses of Group 2 Elements and their Compunds The pure titanium chloride is then reduced in a furnace at a very high temperature (around 1000☌).
Fractional distillation is used to purify the titanium chloride.
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