1. With the help of a chemical equation write the formula of green substance formed on the surface of copper vessel if it is exposed to moist air for a long time.
2. Do iron and copper also react with air in the same way as Sodium? Give reason for your answer
3. How will you identify the chemical nature of SO2 . Explain its formation with the help of an activity and write the related chemical equations.
From chapter metals and non-metals class 8
Answers
Answer:
Type your question...
CHEMISTRY
Copper becomes green when exposed to moist air for a long period. This is due to :
October 15, 2019avatar
Ramna Fauzdar
SHARE
VIDEO EXPLANATION
ANSWER
When a copper vessel is exposed to moist air for a long time it develops a green layer on its surface. Copper corrodes by oxidation in which it reacts with oxygen in the air to form copper oxide.
Copper oxide then combines with carbon dioxide to make copper carbonate, which gives it a green colour. This process is called corrosion of copper.
The green material is a mixture of copper hydroxide (Cu(OH)2) and copper carbonate (CuCO3). The following is the reaction:
2Cu(s)+H
2
O(g)+CO
2
+O
2
→Cu(OH)
2
+CuCO
3
(s)
Copper(II) carbonate is a blue-green compound.
The green substance which is formed on exposure of copper in moist air is copper oxide
2Cu+ O2 ----> 2CuO
Explanation:
- Iron reacts in a similar way as compared to copper and results in the formation of rust which is actually hydrated iron oxide. Sodium also reacts with air to form sodium oxide.
- The gas Sulphur dioxide is acidic in nature and reacts with water to form sulfuric acid. The sulphur dioxide is formed by the dehydration of the sulphuric acid. It is one of the gas which is responsible for air pollution
to know more about Sulphur dioxide,
name one source and one harmful effect of Sulphur dioxide - Brainly.in
https://brainly.in/question/6406459