Feb02_09_water

Feb02_09_water - Water Definition of 1 gram (weight unit in...

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Unformatted text preview: Water Definition of 1 gram (weight unit in metric system) 1 gram: weight of 1 cm 3 of pure water at 3.98 o C (maximum weight of pure water). Water is very dense compared to air! Every 10 m increase in water depth corresponds to an increase of 1 kg/cm 2 (14.22 lbs/in 2 ) in pressure (equivalent of 1 atmospheric pressure). At the bottom of Mariana Trench, pressure would be 1.1 ton/cm 2 (7.821 ton/in 2 )!!!!! Definition of degree Celsius and calorie o C -- Freezing temperature of pure water. 100 o C -- Boiling temperature of pure water. 1 calorie amount of heat required to raise the temperature of 1 gram of pure water by 1 o C ( specific heat , heat capacity ). specific heat : heat required to raise the temperature of 1 gram of a substance by 1 o C Unit for specific heat: calories/gram/ o C Definition of degree Celsius and calorie Heat and temperature are not the same thing. Heat is energy produced by the random vibrations of atoms or molecules. Temperature is an object's response to an input (or removal) of heat. Heat Capacity is a measure of the heat required to raise the temperature of 1 gram of a substance by 1 C (unit for heat capacity calories/gram/ C ) Degree Celsius is a unit for temperature Calorie is a unit for heat Water has a very high heat capacity, which means it resists changing temperature when heat is added or removed. A water molecule (H 2 O) is composed of two hydrogen atoms and one oxygen atom. Water is a polar molecule , having a positive and a negative side. A molecule is a group of atoms held together by chemical bonds . Chemical bonds, the energy relationships between atoms that hold them together, are formed when electrons- tiny negatively charged particles found toward the outside of an atom - are shared between atoms or moved from one atom to another. In the case of water molecule, this chemical bond is called covalent bond . In a covalent bond , the atoms of a compound share electrons The waters remarkable thermal properties result from its molecular structure What holds water molecules together? Hydrogen bonds form when the positive end of one water molecule bonds to the negative end of another water molecule. What are two important properties of water molecules?...
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Feb02_09_water - Water Definition of 1 gram (weight unit in...

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