class 7th
chapter name - physical and chemical change.
Q1. answer the following-
1. What is galvanization?
2. What is rust? How is it formed?
Answers
1.Galvanization (orgalvanizing as it is most commonly called) is the process of applying a protective zinc coating to iron or steel, to prevent rusting. The most common method is hot dip galvanizing, in which steel sections are submerged in a bath of molten zinc.
2.Rusting is an oxidation reaction. The iron reacts with water and oxygen toform hydrated iron(III) oxide, which we see as rust. This prevents the metal below from coming into contact with air (containing oxygen).
Answer:
galvanization is the process of coating a layer of metal on iron or steel to prevent rusting.
Oxidation of iron material is called rust. when iron comes in contact with moisture (air) and oxygen, rust is formed.
Explanation:
Zinc is coated on iron sheet to prevent rust. The sheet is dipped in molten zinc to get galvanized and after that it is allowed to cool.
Rusting is a chemical change and is a continuous process that eats away iron particles , thus reducing its strength. it is a wasting process and should be prevented.