Question: What is the difference between a physical change and a chemical change??
Descriptive Science Questions and Answers
Descriptive Science Questions and Answers
1. What is the difference between a physical change and a chemical change?
A physical change alters the form or appearance of a substance without changing its chemical composition. A chemical change results in the formation of new substances with different properties.
2. Explain the process of photosynthesis.
Photosynthesis is the process by which green plants use sunlight, carbon dioxide, and water to produce glucose and oxygen using chlorophyll. Equation: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
3. What are the main parts of a cell and their functions?
– Nucleus: Controls cell activities – Cytoplasm: Site of cellular activities – Cell membrane: Controls entry/exit of substances – Mitochondria: Produces energy – Ribosomes: Makes proteins
4. Define matter and list its states.
Matter is anything that has mass and occupies space. The three main states are: Solid, Liquid, and Gas.
5. What causes seasons on Earth?
Seasons occur due to the tilt of Earth’s axis and its revolution around the Sun, causing different parts of Earth to receive varying sunlight.
6. What is combustion? Give examples.
Combustion is a chemical reaction with oxygen that releases heat and light. Examples: burning wood, candle, petrol.
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Soleman Ali
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https://videopress.com/v/ju0djxDI?resizeToParent=true&cover=true&preloadContent=metadata&useAverageColor=true Here are 10 short Hindi sentences with their English translations:1. मैं स्कूल जाता हूँ।→…