I am having trouble finding the physical and chemical properties of Calcium, especially because I dont understand a lot of what I am reading. Could someone please help me out with this?
Thanks soo much. :)
2007-11-12 13:43:00 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
Chemical Properties of Calcium
Electrochemical Equivalent: 0.7477g/amp-hr
Electron Work Function: 2.87eV
Electronegativity: 1 (Pauling); 1.04 (Allrod Rochow)
Heat of Fusion: 8.54kJ/mol
Incompatibilities:
water, oxidizers, acids, air, chlorine, chlorine tri-fluoride, fluorine, oxygen, silicon, sulfur
Ionization Potential
First: 6.113
Second: 11.871
Third: 50.908
Valence Electron Potential (-eV): 29
Physical Properties of Calcium
Atomic Mass Average: 40.078
Boiling Point: 1757K 1484°C 2703°F
Coefficient of lineal thermal expansion/K-1: 22E-6
Conductivity
Electrical: 0.298 106/cm
Thermal: 2.01 W/cmK
Density: 1.55g/cc @ 300K
Description:
silvery, soft metal, tarnishes to grayish white after exposure to air.
Elastic Modulus:
Bulk: 17/GPa
Rigidity: 7.4/GPa
Youngs: 20/GPa
Enthalpy of Atomization: 184 kJ/mole @ 25°C
Enthalpy of Fusion: 8.54 kJ/mole
Enthalpy of Vaporization: 150 kJ/mole
Flammablity Class: Flammable solid
Freezing Point: see melting point
Hardness Scale
Brinell: 167 MN m-2
Mohs: 1.75
Heat of Vaporization: 153.6kJ/mol
Melting Point: 1112K 839°C 1542°F
Molar Volume: 26.02 cm3/mole
Pysical State (at 20°C & 1atm): Solid
Specific Heat: 0.632J/gK
Vapor Pressure = 254Pa@839°C
2007-11-12 13:48:28 · answer #1 · answered by Tamra 2 · 0⤊ 0⤋
Tell us what you are reading? Calcium is a Group II alkaline earth metal, which means it is brittle. It is not a structural metal such as iron. It is a very plentiful, but usually found in compounded form. Elemental calcium will tarnish with oxygen from the air, and will displace H2 from water, although not as violently as does sodium or potassium. It forms ionic salts. Its hydroxide, Ca(OH)2, is a strong base, although its solubility is limited, and can react with CO2 in water to form CaCO3. CaCO3 is a major component of sea shells and coral, and is an important regulator of pH in the ocean. Calcium reacts with chlorine in water to produce CaCl2 and Ca(OCl)2, the latter compound being used to disinfect pool and drinking water. Calcium is vital to plant and animal life forms; its nitrate make an excellent fertilizer to supply both nutrients.
2007-11-12 14:01:16 · answer #2 · answered by cattbarf 7 · 0⤊ 0⤋
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2016-12-08 20:12:00 · answer #3 · answered by ? 4 · 0⤊ 0⤋