Chapter4= Sorting of materials into Groups.
1. How will you identify materials based on their hardness? Give examples.
2. What are soluble and insoluble materials?
3. Why do you need to classify or group things around you?
4. Differentiate between transparent, translucent and opaque materials.
5. What happens when chalk powder and sand ae added to water? Why?
6. What happens when kerosene oil and cooking oil are added to water? Why?
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Answers
Answer:
uestion 3 What is meant by transparent material? Give 2 ... Question 11 How will you classify the materials on the basis of properties?
Answer:
1) we can identify materials based on their hardness by those materials which cannot be easily compressed cut , moulded or scratched ex: iron ,steel
2) substances which are mixed with water are called soluble substances ex : salt
substances that do not form solutions when mixed with water are called insoluble substances ex : oil
3) to understand the relationships bety different organisms
4) translucent
: allow some light to allow through them
transparent : to all visible light
Opaques : block light from travelling through them
5) chalk doesn't dissolve in water because chalk comprises CaCo3 which is insoluble
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