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.

3,687 Questions

Does calcium have a luster?

Yes, because calcium is a metal. The fresh surface of calcium has a silvery appearance.

Metal and Alloys

How do you make anhydrous calcium chloride from calcium oxide?

2NH4Cl + CaO --> 2NH3 + CaCl2 + H2O

Metal and Alloys

How was calcium discovered?

It is assumed that because of the abundance of calcium compounds on the earth that is was used very early in human history. Though it was only until 1807 when a scientist by the name of Humphry Davy discovered how to extract the element itself from its compound. Since calcium reacts with oxygen and water this was very difficult.

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What is the flammability of calcium?


Slogans and Mottos

What is the the slogan of calcium?

it does a body good ! you know milk

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What is the difference between calcium atom and calcium ion?

A calcium atom contains 20 electrons and is electrically neutral. A calcium ion contains only 18 electrons and is positively charged.

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Does bread have calcium?

Does Bread Have Calcium?


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How common is calcium?

it is very common to the nature


What is calcium in biology?

Calcium is a vitamin that is vital to our body's health. It helps us to make our bones more stronger.

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What is sufficient calcium?

The following table shows the need calcium for every age group.

Ages Calcium

0-6 months 210

7-12 months 270

1-3 years 500

4-8 years 800

9-18 years 1300

19-50 years 1000

51+ years 1200

Fruits and Vegetables

What fruit has calcium in it?

Most fruits have at least some calcium, but a few that have a more than usual are: blackberries, blackcurrants, dates, grapefruit, mulberries, orange, pomegranate, and prickly pears.

Food & Cooking

What foods contain calcium?

There are many foods that contain calcuim - such as dairy products and green vegetables. Here are a few examples of foods that contain calcium (there are many others, but not all of them are healthy foods, such as ice cream, or foods that are good for you in the long term):

  • broccoli
  • kale
  • collard greens
  • bok choi
  • mustard green
  • sardines
  • almonds
  • salmon
  • sesame seeds
  • spinach
  • cheeses (such as Swiss, Cheddar, Parmesan, ricotta, mozzarella, etc., etc.
  • beans
  • hummus
  • milk
  • yogurt
  • orange
  • rhubarb
  • fortified cereal (these are refined processed carbohydrates)
  • oysters
  • firm tofu

Many low-fat dairy foods have increased calcium content because the fat portion is replaced with an equal portion part of skimmed milk. For example, a portion of skim or low-fat milk has more calcium than a portion of whole milk. This is because almost all of the portion is made up of the calcium-containing portion.

milk, yogurt, cheese, and cereal (General Mills), veggies, and some fruit.

Oral Health and Dental Care

How does calcium help your body?

1) The body needs calcium for muscles to move and for nerves to carry messages.

2) Help release hormones and enzymes

3) Help build and maintain healthy bones and strong teeth
In the diet, calcium is the primary mineral in bone formation, so growing children need a lot of milk (rich in calcium) for proper development.

In the water supply, calcium is a major factor in the development of scale and mineral deposits that can clog the plumbing system.

So, calcium in milk is good. Calcium in water, not so much.

Swimming Pools
Pool Care and Cleaning
Elements and Compounds

If you over-chlorinated your hot tub how do you lower the chlorine level?

The easiest way is to just wait a couple of days the chlorine levels will drop on their own. Also, if you use a pool cover, leave it off. This allows free Chlorine to evaporate from the surface. === ===

Metal and Alloys

What are calcium effectors in calcium signaling?

There are none so stop thinking so.

Elements and Compounds

What is calcium carbonate?

Calcium carbonate is an ionic salt, formed from the cationic calcium (II) and the anionic carbonate ion CO32-. It is found naturally in limestone and in seashells.

vCalcium carbonate reacts with acids, releasing carbon dioxide:


vCalcium carbonate will react with water that is saturated with carbon dioxide to form the soluble calcium bicarbonate.

CaCO3 + CO2 + H2O → Ca(HCO3)2

This reaction is important in the erosion of carbonate rocks, forming caverns, and leads to hard water in many regions.

Water with a large amount of dissolved calcium is hard water.

Elements and Compounds
Metal and Alloys

What are practical uses of calcium?

One must be careful to distinguish between the pure metallic element called Calcium and the compound Calcium carbonate that has often been colloquially referred to as simply calcium.

  • Pure calcium is a soft grey alkaline earth metal,
  • In compounds it is the fifth most abundant element by mass in the Earth's crust.
Calcium is essential for living organisms, particularly in cell physiology, where movement of the calcium ion Ca2+ into and out of the cytoplasm functions as a signal for many cellular processes. As a major material used in mineralization of bones and shells, calcium is the most abundant ion by mass in many animals.

Metallic calcium (the less common form in nature) is used in various commercial roles other than as nutritional supplements to support biological life. Some uses include:
  • Working as a reducing agent in the extraction of other metals, such as uranium, zirconium, and thorium
  • Working as a deoxidizer, desulfurizer, or decarbonizer for various ferrous and nonferrous alloys
  • Working as an alloying agent used in the production of aluminium, beryllium, copper, lead, and magnesium alloys

The more 'natural form' of calcium is ionically bound in 'calcium containing compounds', it serves important roles in life as well:
  • Calcium, combined with phosphate to form hydroxylapatite, is the mineral portion of human and animal bones and teeth.
  • Used in the making of cements and mortars to be used in construction.
    Calcium hydroxide (slaked lime) is used in many chemical refinery processes and is made by heating limestone at high temperature (above 825°C) and then carefully adding water to it. When lime is mixed with sand, it hardens into a mortar and is turned into plaster by carbon dioxide uptake. Mixed with other compounds, lime forms an important part of Portland cement.
  • Calcium carbonate (CaCO3) is one of the common compounds of calcium. It is heated to form quicklime (CaO), which is then added to water. This forms another material known as slaked lime (Ca(OH)2), which is an inexpensive base material used throughout the chemical industry. Chalk, marble, and limestone are all forms of calcium carbonate.
  • Various calcium salts are used as an alternative to sodium chloride as road salt.
  • Used in the making of cheese, where calcium ions influence the activity of rennin in bringing about the coagulation of milk
Metal and Alloys

Is calcium an insulator?


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Does calcium have a malleability?


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Elemental calcium content of calcium chloride?

340 mg

Home & Garden
Elements and Compounds
Metal and Alloys

How do you dispose of calcium chloride?

If present in aqueous solution, by precipitating using sulfuric acid and obtaining insoluble calcium sulphate.

Pool Care and Cleaning
Metal and Alloys

How do you remove and prevent calcium deposits on the rock of a rock waterfall?

Use a commercial lime remover or mild solution of muratic acid, mixed to about 5%. You can also use vinegar. To prevent the deposits from forming, use soft water or distilled water.

Conditions and Diseases
Elements and Compounds
Metal and Alloys

What is calcium build up in the body?

In order to lower your calcium levels in your body you can do a few things. Calcium is used by muscles in the human body so you can exercise and utilize some of the calcium which you have building up. You can also lower the amount of calcium you get per day and increase your fluids. Also talk to your DR. about meds that lower calcium levels such as loop diuretics, and corticosteroids.

Metal and Alloys

Calcium oxide plus water equals calcium hydroxide?

how do you write a balanced chemical formula for this question

CaO + H2O ---> Ca(OH)2

Medication and Drugs
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Why the calcium decrease creates convulsion?

Since calcium deficiency causes the neurons to be depolarized easily, and thus repetitive depolarization occurs which will lead to accumulation of acetylcholine in the neuromuscular junction and can cause repetitive muscle contractions which can progress to tetany


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