Dating Techniques
1.Radiocarbon dating is used to determine the age of carbon bearing materials like wood, animal fossils etc.
2.Uranium dating is used to determine the age of Earth, minerals and rocks.
Battery
1. Battery is a device, used to convert chemical energy into electrical energy and is of two types
(i) Primary batteries (non-rechargeable) act as galvanic cell, e.g., dry cell, mercury cell etc.
(ii) Secondary Batteries: (rechargeable) Act as galvanic as well as voltaic cell E.g., lead storage battery, nickel cadmium battery etc.
Corrosion
1.The oxidative deterioration of a metal surface by the action of environment is called corrosion, an electrochemical process.
2. When iron exposed in to air, iron surface turns brown due to the formation of hydrated ferric oxide (Fe203.xH20) which is also called rust.
3. Silver - Surface turns black due to the formation of silver sulphide (Ag2S).
Renewable Non-renewable Natural Resources
1.Renewable resources are available in large excess, i.e., never ends, e.g, air, sunlight etc.
2. Non-renewable resources are available in limited quantity and end, if used excessively, after a limited period of time.
e.g., mineral, coal, petroleum, natural gas etc.
Fuels
1.The substance, which produce heat and light on combustion are called fuels.
2.A strong foul smelling substance, called ethyl mercaptan is added to LPG to detect its leakage as LPG is an odourless gas.
Chemistry Notes-1
1.Radiocarbon dating is used to determine the age of carbon bearing materials like wood, animal fossils etc.
2.Uranium dating is used to determine the age of Earth, minerals and rocks.
Battery
1. Battery is a device, used to convert chemical energy into electrical energy and is of two types
(i) Primary batteries (non-rechargeable) act as galvanic cell, e.g., dry cell, mercury cell etc.
(ii) Secondary Batteries: (rechargeable) Act as galvanic as well as voltaic cell E.g., lead storage battery, nickel cadmium battery etc.
Corrosion
1.The oxidative deterioration of a metal surface by the action of environment is called corrosion, an electrochemical process.
2. When iron exposed in to air, iron surface turns brown due to the formation of hydrated ferric oxide (Fe203.xH20) which is also called rust.
3. Silver - Surface turns black due to the formation of silver sulphide (Ag2S).
Renewable Non-renewable Natural Resources
1.Renewable resources are available in large excess, i.e., never ends, e.g, air, sunlight etc.
2. Non-renewable resources are available in limited quantity and end, if used excessively, after a limited period of time.
e.g., mineral, coal, petroleum, natural gas etc.
Fuels
1.The substance, which produce heat and light on combustion are called fuels.
2.A strong foul smelling substance, called ethyl mercaptan is added to LPG to detect its leakage as LPG is an odourless gas.
Chemistry Notes-1
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