Chemical Change: Characteristics, Chemical Reaction, Types and Rusting of Iron
Chemical Change: Characteristics, Chemical Reaction, Types and Rusting of Iron: Overview
In this topic, we will learn in detail about chemical change and its characteristics. We will also learn about the chemical reaction and types of chemical reactions. This topic further explains the rusting of iron, its effects and prevention.
Important Questions on Chemical Change: Characteristics, Chemical Reaction, Types and Rusting of Iron
Write the chemical name and chemical formula of the following:
(a) Lime Water
(b) Milk of Magnesia
(c) Rust
(d) Blue Vitriol
(e) Baking soda
Three days when it rained continuously, Akash covered his bicycle with a polythene sheet, whereas his friends just did not bother to do the same to their cycles! Few days later Akash’s friends noticed that their cycles had some brown powdery patches on it where Akash’s seemed to be new.
(b) Which metal is used in making a bicycle? What happened to Akash’s friend’s bicycle? Why did the metal develop reddish-brown patches?
Three days when it rained continuously, Akash covered his bicycle with a polythene sheet, whereas his friends just did not bother to do the same to their cycles! Few days later Akash’s friends noticed that their cycles had some brown powdery patches on it where Akash’s seemed to be new.
(a) What quality did Akash exhibit by covering his bicycle?
What happens when baking soda is treated with vinegar? Give chemical equation.
The gas we use in kitchen is LPG. In the cylinder, it exists as a liquid. When it comes out from the cylinder, it becomes a gas, then it burns. Mention the changes taking place.
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
(d) Give two examples of a similar type of change.
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
(c) Do you think formation of rust from iron is a chemical change?
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
(b) Can you change rust back into iron by some simple methods?
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
(a) Do you think rust is different from iron?
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
(c) Write a word equation for the chemical change if any.
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
(b) Are these changes chemical in nature?
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
(a) What changes do you expect?
What is galvanisation? Why is it done on metals which corrode easily?
Explain how painting of an iron gate prevents it from rusting.
How is salt extracted from seawater?
What happens when magnesium oxide is dissolved in water? Write the chemical reaction.
Write word equation for the following:
(b) Iron displaces copper from its copper sulphate solution.
Write word equation for the following:
(a) Formation of rust
Give an example of a chemical reaction for the following situation:
(c) Sound is produced.
Give an example of a chemical reaction for the following situation:
(b) A gas is evolved.
