1. TOPIC: MATTER IN OUR SURROUNDINGS a) Explain three states of matter b) Discuss their properties c) Classify the things present around you as solids liquids and gases d) Explain the cause of their rigidity and fluidity e) Take a 100 ml beaker. Fill half the beaker with water and mark the level of water. Dissolve some salt/ sugar with the help of a glass rod. Observe the change in the water level. What do you think happened to the salt?
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Answer:
a) The three states of matter are: Solid,liquid, and gas.
b) Properties of solid: They are rigid. The molecules in solids are very closely packed.
Property of liquids: Liquids have tendency to flow. The molecules in liquids have gap between them as compared to solids.
Property of gases: The molecules of gases have large gaps between them.
c) Solids: Wood, plastic, table, metal etc.
Liquids :water
Gases:carbon dioxide, oxygen