PUMPA - SMART LEARNING
எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்
Book Free DemoRead the following case and answer the following questions:
A student lights a candle during a power cut. After a few minutes, she notices that the solid wax near the flame melts into liquid wax. The liquid wax is then heated further and changes into wax vapour, which burns in the presence of oxygen to produce heat and light. After the candle is blown out, the melted wax cools and becomes solid again. The student concludes that different types of changes are taking place during the burning of a candle.
Read the case carefully and answer the following questions.
Read the case carefully and answer the following questions.
1. Which of the following is a physical change observed during the burning of a candle?
2. Why is the burning of candle wax considered an irreversible chemical change?
3. Which sequence correctly represents the changes occurring during the burning of a candle?
4. After the candle is blown out, the melted wax cools and becomes solid again. This change is called:
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