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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
How many atoms of calcium are present in 58.2 g of calcium?
One mole of anything, no matter what the element is, is Avogadro's number, which is 6.02 * 10^23 atoms.
One mole of Calcium is equal to it's atomic weight in grams :
1 mole Ca = 40.08 g = 6.02 * 10^23 atoms
There is a 1000mg in a gram. 1000mg * 40.08g =
=40,080mg of Ca per mole
If you have 8.6mg of Ca that is 8.6mg / 40,080mg = .00021457 of a mole of calcium
so just multiply that by Avogadro's number to give you number of atoms:
.00021457 * 6.02 * 10^23 atoms = 1.292 * 10^20 atoms of Ca
What can you get calcium from?
You can get calcium from dairy products such as milk, yogurt, and cheese, as well as from leafy green vegetables, tofu, and fortified foods like orange juice and cereals. Additionally, you can also find calcium in fish with edible soft bones, such as sardines and canned salmon.
What is the atomic number of calcium and what does that number tell you about an atom of calcium?
The atomic number of calcium is 20. The atomic number tells you the number of protons in the nucleus of a calcium atom, which also corresponds to the number of electrons in a neutral calcium atom.
Why is calcium oxide CaO but calcium chloride is CaCl2?
in calcium chloride each calcium atom needs to lose two electrons but each chlorine atom needs to gain only one electron. This means that two chlorine atoms react with every one calcium atom to form calcium chloride. So the formula for calcium chloride is CaCl2.
ca = proton number is 20 so the structure would be 2, 8 ,8 ,2
cl = proton number is 17 so the structure would be 2 , 8,7
To make it stable calcium has to lose 2 electrons and chlorine has to gain an electron. However if you add 2 to 7 in the chlorine it will make 9 so it will still be unstable therefore you need two chlorine atoms to share out the 2 atoms in calcium.
Calcium is an essential mineral in biology that plays a crucial role in many physiological processes. It is important for bone health, muscle function, nerve transmission, and cell signaling. The body tightly regulates calcium levels to ensure proper function of these processes.
The LD50 of calcium is the amount of calcium that would be lethal to 50% of the test population. The LD50 value for calcium can vary depending on the form of calcium, but generally, it is considered to be relatively high. Ingesting extremely high doses of calcium supplements can lead to toxicity symptoms like kidney stones, constipation, and heart rhythm abnormalities.
How many moles of calcium are in 5000 grams of calcium?
To find the number of moles in 5000 grams of calcium, you need to divide the given mass by the molar mass of calcium. The molar mass of calcium is approximately 40.08 g/mol. So, 5000 grams of calcium is equal to 5000/40.08 = 124.69 moles of calcium.
Yes, calcium is an essential mineral for cats as it helps maintain healthy bones and teeth. Cats can get calcium from their diet, typically from sources such as bone meal, dairy products, and fish. It's important to ensure that cats have a balanced diet to meet their calcium needs.
What is the difference between calcium carbonate and calcium lactate?
Calcium carbonate is a common calcium supplement that is inorganic and poorly absorbed, while calcium lactate is an organic form of calcium that is more easily absorbed by the body. Calcium carbonate is typically found in antacids, whereas calcium lactate is commonly used in food fortification and as a dietary supplement.
What sort of chemicals are calcium hydroxide and calcium carbonate?
Calcium hydroxide is an ionically bonded compound that dissolves in water to form a strong alkali; calcium carbonate is an ionically bonded compound that dissolves in water to form a weakly alkaline solution.
Is calcium a neurotransmitter?
No, calcium itself is not a neurotransmitter BUT it is highly important in the process of the action potential. The action potential triggers the influx of calcium at the end of the terminal bouton, causing the influx of Ca2+ into the cell and this triggers for the release of the neurotransmitter. :)
Calcium itself does not tarnish. However, calcium compounds or alloys may undergo oxidation or corrosion, which can lead to tarnishing. For example, calcium metal can react with oxygen in the air to form calcium oxide, a process known as oxidation.
Does mining calcium have an impact on the environment?
Mining calcium, often in the form of limestone, can have various environmental impacts such as habitat destruction, groundwater contamination, and air pollution from dust and greenhouse gas emissions. It may also contribute to soil erosion and disrupt local ecosystems. Implementing sustainable mining practices and reclamation efforts can help mitigate these negative impacts.
Calcium was discovered by Sir Humphry Davy in 1808 through the process of electrolysis. He isolated calcium metal by passing an electric current through molten calcium chloride. This discovery helped in understanding the nature of elements and their properties.
Is there a difference between calcium sulphate and calcium sulfate dihydrate?
No, calcium sulfate and calcium sulphate are the same chemical compound, commonly known as gypsum. Calcium sulfate dihydrate specifically refers to the hydrated form of calcium sulfate, where each molecule contains two molecules of water (CaSO4 ∙ 2H2O).
What is the mass percent of calcium in calcium bromide?
The molar mass of calcium bromide (CaBr2) is 199.89 g/mol. Calcium has a molar mass of 40.08 g/mol. The mass percent of calcium in calcium bromide is calculated as (40.08 g/mol / 199.89 g/mol) x 100%, which is approximately 20.04%.
No, calcium is a mineral that plays crucial roles in the body's structure and functions, particularly in bone health and muscle contraction. DNA, on the other hand, is a molecule that carries genetic information in cells. They are completely different entities with different functions in the body.
Elemental calcium content of calcium chloride?
Calcium chloride contains around 36-40% elemental calcium by weight. This means that for every 100 grams of calcium chloride, there would be approximately 36-40 grams of elemental calcium. It is important to consider this when calculating the actual amount of calcium being consumed from calcium chloride supplements or additives.
How many atoms of calcium are in 80.0 grams of calcium?
You need to know the molar mass for Ca which is: 40.078 g/mol and avrogadros # or whatever which is: 6.022 x 10^23
So:
80.0g Ca x (1 mol Ca / 40.078 g Ca) = 1.996 mol Ca (this eliminated grams)
1.996 mol Ca x (6.022 x 10^23 atoms / 1 mol Ca) = 1.202 x 10^24 atoms of calcium
Just remember the fraction 6.022 x 10^23 atoms / 1 mol ! It's the same thing so you can flip it!
No.
Since potassium is an element by itself, it does not have calcium in them.
However, it could combine together to create potassium calcium (which is a vitamin).
There are such things as a potassium calcium channel in a cell.
Why do we need calcium and how do we get it?
Calcium is essential for building and maintaining strong bones and teeth, as well as proper muscle function and nerve transmission. We can get calcium from dairy products like milk, cheese, and yogurt, as well as from green leafy vegetables, nuts, and fortified foods such as plant-based milks and orange juice.
How many moles of calcium are in 15.5 g calcium chloride?
If grams/molar mass=moles, then first the molar mass of the compound must be found. CaCl2 has a molar mass of 110.984. Divide the number of grams, 15.5, by 110.984, and you get the number of moles. Now, seeing as calcium is not diatomic like oxygen or chlorine, there needs to be no conversion between the number of moles of calcium in the compound and the number of moles of calcium outside of the compound. atoms, the number of calcium atoms in the compound divided by one mole of the compound will give us the ratio. Conveniently enough, that ratio is one calcium atom per molecule of calcium chloride, meaning that for every one mole of calcium chloride, 1 mole of pure calcium can be extracted. So once you find the number of mole of CaCl2, that is the number of moles of calcium as well. This may be a little difficult to grasp, but I'm sure that your teacher, if you're a student, will be able to explain why rather well.
Calcium carbonate to form calcium oxide and carbon dioxide?
Calcium carbonate is heat at very high temperatures (near 1000°C) and it decomposes into Calcium oxide and Carbon dioxide:
CaCO3 --Δ--> CaO + CO2
When water is added to Calcium oxide, the Calcium hydroxide is formed:
CaO + H2O ----> Ca(OH)2
This can be again converted back to Calcium carbonate, by blowing Carbon dioxide through the solution. The white precipitate is Calcium carbonate:
Ca(OH)2 + CO2 ----> CaCO3 + H2O
What is the difference between Oyster Shell calcium and calcium Carbonate?
Oyster shell calcium is derived from oyster shells and contains other minerals besides calcium. Calcium carbonate is a more common form of calcium supplement that is synthetically made and contains only calcium. Oyster shell calcium may be better absorbed by some individuals due to the additional minerals present.
