III. Answer the following questions in short!
1. State whether rusting of iron is a physical or a chemical change? How can you prevent
rusting of iron?
2. Is an earthquake a periodic or non-periodic change? Give reasons. Also mention some of the losses that occur due to earthquakes.
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Answers
Answer:
1. For Example, when the iron is exposed toair and moisture, rust formation takes place. Rust is nothing but Iron Oxide; a new substance formed out of thereaction. The colour of the surface of theiron also changes. Hence, rusting of ironis a chemical change.
2. Your search - Is an earthquake a periodic or non-periodic change? Give reasons. Also mention some of ... - did not match any documents.
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Explanation:
- The Rusting of iron is a chemical change because an entirely new substance is formed (rust) .
Galvanizing is a method of rust prevention. The iron or steel object is coated in a thin layer of zinc. This stops oxygen and water reaching the metal underneath - but the zinc also acts as a sacrificial metal . Zinc is more reactive than iron, so it oxidises in preference to the iron object.
The best ways to prevent rust include:
Galvanizing. Galvanizing is a method of rust prevention. ...
Corten or Weathering Steel. ...
Stainless Steel. ...
Proper Pre-Design. ...
Bluing. ...
Regular maintenance. ...
FOZZ. ...
Powder coating.
2. The earthquake is a non periodic change.
Explanation: Earthquake is a non periodic change because it doesn't have fixed time to occur.An earthquake is caused by a sudden slip on a fault. ... When the stress on the edge overcomes the friction, there is an earthquake that releases energy in waves that travel through the earth's crust and cause the shaking that we feel. In California there are two plates - the Pacific Plate and the North American Plate.
Losses caused by earthquake------
Ground shaking is widely considered to be the primary cause of damage to structures, loss of life and injuries due to earthquakes. Nonetheless, there are numerous examples of earthquakes where the losses due to earthquake-induced ground failure have been significant.
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