Flame is a region where the combustion of gaseous substances takes place. It is the visible gaseous part of the fire. The colour of the flame changes with the supply of oxygen. The flame is blue at the base and above when oxygen is freely available to the flame. The flame is yellow with red when the oxygen supply is not sufficient. The flame is yellow when the oxygen supply is poor.

A flame is a zone in which chemical combination between gases takes place accompanied by the evolution of heat and light. It consists of a mass of intensely ignited gaseous matter. Luminous and non-luminous flames are two types of flames.

Science>Chemistry>Combustion and Flame>Flame

EASY

Earn 100

Write the difference between burning of candle and burning of coal.

Important Questions on Combustion and Flame

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Science>Chemistry>Combustion and Flame>Flame

Coal burns with flame.

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Science>Chemistry>Combustion and Flame>Flame

Define flame.

MEDIUM

Science>Chemistry>Combustion and Flame>Flame

Explain why flame is observed during burning of a substance.

MEDIUM

Science>Chemistry>Combustion and Flame>Flame

How does a candle flame work?

EASY

Science>Chemistry>Combustion and Flame>Flame

Charcoal or coal burns with a glow not a flame. Why?

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Science>Chemistry>Combustion and Flame>Flame

What name is given to a region of burning gases?

MEDIUM

Science>Chemistry>Combustion and Flame>Flame

Unburnt carbon particles form _____, which appears as a dark powder.

MEDIUM

Science>Chemistry>Combustion and Flame>Flame

What is a flame? What type of substances, on burning, give a flame?

EASY

Science>Chemistry>Combustion and Flame>Flame

_____ is the zone of combustion of gaseous fuel.

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Science>Chemistry>Combustion and Flame>Flame

Define flame. When is it produced?

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Science>Chemistry>Combustion and Flame>Flame

How does wick of a candle helps flame to burn? What are the constituents of a wick?

EASY

Science>Chemistry>Combustion and Flame>Flame

The hottest part of the candle flame is the _____ zone. (middle, outer, innermost)

MEDIUM

Science>Chemistry>Combustion and Flame>Flame

Which material is used in the making of a wick and why?

MEDIUM

Science>Chemistry>Combustion and Flame>Flame

Write the differences between burning of candle and burning of coal.

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Science>Chemistry>Combustion and Flame>Flame

What is a flame?

MEDIUM

Science>Chemistry>Combustion and Flame>Flame

Some paper is wound around (a) a wooden cylinder (b) an aluminium cylinder. Each of the cylinders is held over a bunsen flame for 10 seconds. What will you observe? Explain your answer.

EASY

Science>Chemistry>Combustion and Flame>Flame

Cotyledons are also called-

HARD

Science>Chemistry>Combustion and Flame>Flame

What is the difference between the burning of a candle and the burning of a fuel like coal?

MEDIUM

Science>Chemistry>Combustion and Flame>Flame

Why do we make use of a wick in oil lamps?

EASY

Science>Chemistry>Combustion and Flame>Flame

Name the main constituents of gel candles.