Activity 2.10 Class 9 Science Is Matter Around Us Pure
In this
post, you will find NCERT Science Class 9 Chapter 2 Activity solutions. In
Class 9 science chapter 2 Is Matter Around Us Pure consists of NCERT Activity
2.10 Class 9 Science Explanation with a conclusion.
Activity
2.10 NCERT Class9 Science Is Matter Around Us Pure
You are
suggested to study NCERT activity 2.10 class 9 science Is matter around us pure
explanation with a conclusion so that you can attempt questions based on the
activity 2.10 class 9 science. Activity 2.10 class 10 science will be very
useful for you.
Activity
2.10 Class 9 Science
·
Divide
the class into two groups. Give 5g of iron fillings and 3g of sulphur powder in
a china dish to both the groups respectively.
Group I
·
Mix
and crush iron filings and sulphur powder.
Group II
·
Mix
and crush iron filings and sulphur powder. Heat this mixture strongly till red
hot. Remove the flame and let the mixture cool.
Group I and II
·
Check
for magnetism in the material obtained. Bring a magnet near the material and check
if the material is attracted towards the magnet.
·
Compare
the texture and colour of the material obtained by the groups.
·
Add
carbon disulphide to one part of the material obtained. Stir well and filter.
·
Add
dilute sulphuric acid or dilute hydrochloric acid to other parts of the material
obtained.
Answer the following questions
i. Did the material obtained by the two groups look the same?
ii. Which group has obtained a material with magnetic properties?
iii. Can we separate the components of the material obtained?
iv. On adding dilute sulphuric acid, did both the groups obtain a gas? Did the gas in both the cases smell the same or different?
Observation
Group I
When a magnet is
brought towards the mixture of iron filings and Sulphur powder, iron filings
get attracted to the magnet, so both iron and sulphur are separated.
Group II
When iron filings
and sulphur powder are mixed and heated, new substances are formed due to the chemical reaction between iron and sulphur.
heat
Iron filing + Sulphur --------→Iron sulphide
Explanation
When iron filings and sulphur powder are mixed,
they form a heterogeneous mixture and involve only physical change. So they can
be separated by a physical method.
On the other hand,
when iron filings and sulphur powder are mixed and heated, they undergo a chemical
change, so they cannot be separated by a physical method.
Answer to the above questions
i. The material obtained after the activity by the two groups looked different. The material obtained by the group I is a mixture of iron and sulphur. The properties of the mixture are the same as that of its constituents.
On the other hand, the material obtained by group II is a compound which has different properties compared to the combining elements.
ii. Group I has obtained a material (containing iron filings) with magnetic properties.
iii. The material of group I is a mixture and components can be separated.
iv. On adding dilute sulphuric acid or dilute sulphuric acid to the material obtained by both groups, the evolution of gas occurred. The smell of gases in both cases is different.
The gas obtained by the group I is hydrogen(H2) because when dilute acid is added to the material obtained by group I, iron reacts with an acid to produce hydrogen gas.it is a colourless and odourless gas.
The gas obtained by group II is hydrogen sulphide because when dilute acid is added to the material obtained by group II, Iron sulphide reacts with an acid to produce hydrogen sulphide.
Iron sulphide + dilute hydrochloride→ Iron chloride + Hydrogen sulphide
Related Topics for you
1. First Activity - Activity 2.1 Class 9 Science
2. Previous Activity-Activity 2.9 Class 9 Science
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