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Calcium

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by

Siena Peri

on 7 May 2010

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Transcript of Calcium

Slide 2

Atomic Number: 20

Atomic Mass: 40.1 amu

Classification of the element: Metal

Group: Alkaline Earth Metal



Name of Element: Calcium
Element Symbol: Ca
Group Members: Imani Mitchell, Clarissa Martinez, and Siena Peri
Grade: 8
Period: 5
Date of Presentation: 5/ 7 /10

Slide: 3


When was the element discovered?

The year 1808

How was the element discovered?

British chemist Sir Humphry Davy
discovered calcium by using
electrolysis on a mixture
of lime (CaO)
and mercuric oxide (HgO)

Where was the element discovered?

England

Who discovered the element?

British chemist Sir Humphry Davy

Common historical uses for the element

•Calcium is used in ma reducing
agent for the preparation of metals
such as thorium, uranium,
zirconium, etc.

•Calcium is used in magnets
and cement. Calcium is also
an important mineral for strong
bones and teeth.


What were substances you could find the element during that time period?

Calcium is most commonly found in rocks (such as lime)
all around the world which is the main component
in the following substances.
• Shells
• Marine Organisms
• Snails
• Egg Shells

Slide 7: Two Interesting Facts About Calcium Slide:4

Physical Properties:
1.Color- Silvery White
2.Melting Point- 840oC
3.Boiling Point- 1484oC
4.Density- 1.55g/cc at 300K
5.Thermal Conductivity- 200
Slide: 5

Chemical Properties:
1.Electrochemical Equivalent-0.7477g/amp-hr
2.Electron Work Function-2.87eV
3.Electronegativity-1 (Pauling); 1.04 (Allrod Rochow)
4.Heat of Fusion- 8.54kJ/ mol
5.Valence Electron Potential (-eV)- 29

Slide:6

Calcium forms alloys with aluminum, beryllium, copper, lead, and magnesium.

It is used in the manufacture of other metals such as uranium and thorium.

Calcium is used to remove oxygen, sulfur and carbon from alloys.

Calcium from limestone is a vital component of Portland cement.

Plaster and Quicklime (CaO) is used in many applications in the chemical industry, such as treatment of drinking water - especially for water softening and arsenic removal, animal waste and wastewater.

Used for dehydrating oils, decarburization and desulfurization of iron and its alloys, getter in vacuum tubes. Also used as an alloying agent for aluminum, copper and lead, a reducing agent for beryllium and used in fertilizer, concrete & plaster of paris. Calcium is an essential component shells, bones, teeth and plant structures.

1.) Calcium was prepared as lime by the Romans under the name calyx in the 1st century A.D., but the metal was not discovered until 1808.

2.)Calcium is the fifth most abundant metalic element in the earth's crust, but is never found in the elemental form because it is so reactive.

3.). Calcium was prepared as lime by the Romans under the name calyx in the 1st century A.D., but the metal was not discovered until 1808.

4.) Berzelius and Pontin prepared calcium amalgam by electrolizing lime in mercury. Davy was then successful in isolating the impure metal.

5.) Calcium is the fifth most abundant metalic element in the earth's crust, but is never found in the elemental form because it is so reactive.

6.)Pure calcium is a shiny soft metal that will react violently with water to produce hydrogen.










Calcium Cells












CALCIUM IN ITS SOLID FORM. Calcium as a powder. Calcium Atom's neutrons,
electrons,and nucleus. Sardines contain calcium. Milk has one of the greatest amount
of caliumof all dairy products, Egg Nog
Full transcript