Question

HOTS (Higher Order Thinking Skills) questions
1. Charcoal or coal burns with a glow not a flame. Why?
2. How does wick of a candle helps flame to burn? What are the constituents of a wick?
3. Spilling of crude oil is a severe threat to our sea and oceans. Explain.​

Answer 1

Answer:

Explanation:

1)Charcoal is a solid fuel. This is the reason that it can't vaporious on heating. so that's why coal not burn by producing flame.. Coal or charcoal does not produce flame when burnt because it does not vapourizes, only those substances which vapourizes on burning produce flame like wax , natural gas.

2)A candle wick works by capillary action, conveying ("wicking") the fuel to the flame. When the liquid fuel, typically melted candle wax, reaches the flame it then vaporizes and combusts. The candle wick influences how the candle burns.

3)Most oils float on the oceans' saltwater or freshwater from rivers and lakes. Oil usually spreads out rapidly across the water's surface to form a thin oil slick. ... Depending on the circumstances, oil spills can be very harmful to marine birds, sea turtles and mammals, and also can harm fish and shellfish.

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Answer 2

Answer:

1)

Explanation:

coal does not produce flame when burnt because it does not vapourizes, only substances which vapourizes on burning produce flame like -wax, natural gas.

charcoal doesn't burn with flame because it is non-volatile in nature or doesn't vapourizes on burning.