7/27/2019 Presentation Calcium AKS
1/12
7/27/2019 Presentation Calcium AKS
2/12
7/27/2019 Presentation Calcium AKS
3/12
The History of Calcium The Romans used lime, a compound of
calcium, by the first century A.D. (For more
on lime and its uses, see .)They called it calx, the Latin word for lime.
Calcium was first isolated and identified asan element in 1808 by Sir Humphry Davy.
The origin of calciums name is from theLatin words calx and calcis.
Properties of Calcium Back to Table of Contents
Uses of Calcium
7/27/2019 Presentation Calcium AKS
4/12
Properties of Calcium Calcium is very reactive. It cant be found pure in
nature.
Calcium reacts with water to form calcium
hydroxide (Ca(OH)2). It reacts with oxygen toform calcium oxide (CaO).CaO also reacts withwater to form calcium hydroxide.
Pure calcium is an alkaline earth metal. It is
silvery-white and fairly hard.
Calcium is the twentieth element. The mostcommon calcium isotope, Ca-40, has 20 protons,20 neutrons, and 20 electrons. NextBack
7/27/2019 Presentation Calcium AKS
5/12
Properties of Calcium (II)Calcium Isotope Half-life
Ca-40 Stable (non-radioactive)
Ca-41 103,000 years
Ca-42 StableCa-43 Stable
Ca-44 Stable
Ca-45 162.7 days
Ca-46 Stable
Ca-47 4.5 days
Ca-48 Stable
Ca-49 8.7 minutesNext
Back
7/27/2019 Presentation Calcium AKS
6/12
Properties of Calcium (III) Calcium is a solid at 25 degrees Celsius (room
temperature).
Calcium is metallic and burns with a yellow-redflame.
Calcium has an average atomic mass of 40.078 amu
(atomic mass units.)
Calcium melts at 839C (1112.5K, 1542.2 F.)
Yet More Back
7/27/2019 Presentation Calcium AKS
7/12
7/27/2019 Presentation Calcium AKS
8/12
Uses of Calcium Pure calcium has limited commercial use.
Calcium carbonate (CaCO3, limestone) is anantacid (think Tums.)
Mortar is made by mixing slaked lime (calciumhydroxide) with sand and water.
Most concretes today are based on Portlandcement. The cement is made from limestone, sand,
clay and gypsum. Gypsum is otherwise known as calcium sulfate
dihydrate (CaSO2H2O). It is very important forbuilding. Next
7/27/2019 Presentation Calcium AKS
9/12
More Uses of Calcium Calcium is an important nutrient for a wide range
of human organisms, including humans. Manymarine animals have shells of calcium.
Marble is a metamorphosed form of limestone andis composed of calcium carbonate.
Lime (calcium oxide), made from heating
limestone, is an extremely important industrialchemical.
Calcium chloride (CaCl2), can absorb water easily,even from the air. NextBack
7/27/2019 Presentation Calcium AKS
10/12
7/27/2019 Presentation Calcium AKS
11/12
Obtaining Calcium(For Real This Time) To make pure calcium, you can heat calcium oxide with
aluminum
OR you can make it by the electrolysis of moltencalcium chloride.
You can obtain calcium from gypsum, limestone, andmarble. Limestone and marble are found in the earths
crust, and you can see conical pillars of limestonefilling caves all over the world.
Gypsum is formed by the evaporation of seawater. It isusually found lying in thick beds (of gypsum, of
course.) Atom Drawing of Calcium Table of Contents
7/27/2019 Presentation Calcium AKS
12/12
The Atom Diagram
20 p
20 n
Bibliography Table of ContentsBack
Top Related