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Calcium
Calcium is a chemical element with the atomic number 20 and symbol Ca. It is an alkaline earth metal and one of the most abundant metals in the Earth’s crust. Calcium is also essential for living organisms, both as a catalyst for cellular processes and as a component of shells, bones, and teeth.
873 Questions
What simple ion does calcium form?
Calcium forms a simple ion known as the calcium ion, which has a charge of +2. This occurs when a calcium atom loses two electrons, resulting in the ion denoted as Ca²⁺. This positively charged ion is commonly found in various compounds and plays essential roles in biological processes and chemical reactions.
Is there calcium in cholecalciferol?
Cholecalciferol, also known as vitamin D3, does not contain calcium itself. However, it plays a crucial role in calcium metabolism by helping the body absorb calcium from food and supplements. Therefore, while cholecalciferol doesn't have calcium, it is essential for maintaining healthy calcium levels in the body.
Why Calcium carbonate neither exist in a liquid state nor in gaseous state?
Calcium carbonate (CaCO₃) does not exist in a liquid or gaseous state under normal conditions because it is a solid at room temperature and pressure. Its stability as a solid is due to its strong ionic and covalent bonds in the crystalline structure. When heated, it decomposes into calcium oxide and carbon dioxide rather than melting into a liquid. Thus, its properties and chemical behavior prevent it from existing as a liquid or gas at ambient conditions.
Can the undissolved portion of the mixture of calcium hydroxide solution still be used?
Yes, the undissolved portion of a calcium hydroxide solution can still be used, depending on the application. For instance, in agricultural or water treatment applications, the undissolved particles can provide beneficial effects, such as increasing soil pH or aiding in the precipitation of impurities. However, it's essential to consider the desired concentration and effectiveness of the solution, as excessive undissolved material may hinder its intended use.
What is the reaction of calcium carbonate and hydrogen peroxide?
When calcium carbonate (CaCO₃) reacts with hydrogen peroxide (H₂O₂), a decomposition reaction can occur, particularly in the presence of an acid. The hydrogen peroxide may release oxygen gas (O₂) as it decomposes, while the calcium carbonate may react with any acid present to produce calcium salts, water, and carbon dioxide (CO₂) gas. Overall, the reaction can produce effervescence due to the release of CO₂ and O₂. However, under normal conditions, the direct reaction between just calcium carbonate and hydrogen peroxide is not significant.
