Matter around us — Flashcards
Telangana Board · Class 9 · Physical Science
20 flashcards for Matter around us (Telangana Board Class 9 Physical Science) to test yourself on key terms and facts.
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A perfume sprayed in one corner of a room spreads throughout the room in a few minutes. Why does this happen?
Answer
This happens due to DIFFUSION. Perfume particles move from high concentration (spray point) to low concentration areas, mixing with air particles. Gas particles move continuously and have large spaces…
What is matter? Give the scientific definition.
Answer
Matter is anything that occupies space and has mass. Examples include water we drink, air we breathe, food we eat, and our body. All substances around us are forms of matter.
Why can we compress air in a syringe easily but not water?
Answer
AIR (gas) has large spaces between particles and weak forces of attraction, making it highly compressible. WATER (liquid) has particles closer together with stronger attraction forces, making it nearl…
How do we know that matter is made up of tiny particles?
Answer
Evidence: When we dissolve potassium permanganate crystals in water, a small amount colors large volumes of water. This shows matter contains countless tiny particles that spread uniformly throughout …
What happens when we add salt to water without changing the water level?
Answer
PROCESS: Salt particles dissolve and occupy the empty spaces between water particles. This proves there are gaps between particles in liquids. The water level doesn't rise because salt fills existing …
Why does coconut oil become solid in winter?
Answer
Temperature change causes state change. When temperature drops below coconut oil's freezing point, particles lose energy, move slower, and arrange in fixed positions, changing from liquid to solid sta…
List the properties of SOLIDS.
Answer
1. Definite shape and fixed volume 2. Cannot be compressed easily 3. Particles tightly packed with strong forces 4. Diffusion rate is slowest 5. Particles vibrate in fixed positions Example: Wood, iro…
Why do gases diffuse faster than liquids and solids?
Answer
Two reasons: 1. Gas particles move at very high speeds 2. Large spaces between gas particles allow easy movement. Fewer particles obstruct the diffusion path, making gas diffusion fastest.
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