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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 is the enthalpy of solution of calcium nitrate tetrahydrate in water?
The enthalpy of solution of calcium nitrate tetrahydrate (Ca(NO₃)₂·4H₂O) in water is approximately -11.5 kJ/mol. This value indicates that the dissolution process is endothermic, meaning it absorbs heat from the surroundings, resulting in a decrease in temperature of the solution. This enthalpy change is influenced by the interactions between the solute and solvent, as well as the breaking of ionic bonds in the solid and the formation of hydration shells around the ions.
Which of following describes a relationship between protein intake and calcium metabolism?
Protein intake influences calcium metabolism by affecting calcium absorption and excretion. Higher protein consumption can enhance calcium absorption in the intestine, but it may also increase calcium excretion through urine. Thus, a balanced protein intake is essential for optimal calcium metabolism, supporting bone health and overall calcium homeostasis.
What hormonal problem might a persom which soft bones from lack of calcium have?
A person with soft bones due to a lack of calcium may be experiencing a hormonal problem related to parathyroid hormone (PTH) or vitamin D deficiency. Insufficient calcium levels can lead to increased PTH secretion, which tries to mobilize calcium from bones, contributing to weakened bone structure. Additionally, low vitamin D levels can impair calcium absorption in the intestines, further exacerbating bone softness. This condition is often associated with osteomalacia or osteoporosis.
How many cups of calcium in a pound?
There are approximately 4 cups of calcium in a pound. This measurement can vary slightly depending on the specific form of calcium being measured, such as calcium carbonate or calcium citrate, due to differences in density. However, as a general guideline, 1 pound of calcium equates to about 4 cups.
What happens if you mix epsom salts and calcium chloride?
When you mix Epsom salts (magnesium sulfate) with calcium chloride, a chemical reaction occurs that produces magnesium chloride and calcium sulfate. This reaction is exothermic, meaning it releases heat. The resulting mixture can lead to the formation of solid precipitates, depending on the concentrations used. It's important to handle these chemicals with care, as the heat generated can be significant.
