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Combustion and Flame– EWF- 4

Authored by Aishwaria Murthy

Chemistry, Science

8th Grade

Used 1+ times

Combustion and Flame– EWF- 4
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35 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why some substances burn with a flame while as some burn without a flame?

What is the first statement of this audio clip?

The substances which vapourise during burning, give flames.

For example, kerosene oil and molten wax rise through the wick and are vapourised during burning and form flames.

Charcoal, on the other hand, does not vapourise and so does not produce a flame.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why some substances burn with a flame while as some burn without a flame?

What is the second statement of this audio clip?

The substances which vapourise during burning, give flames.

For example, kerosene oil and molten wax rise through the wick and are vapourised during burning and form flames.

Charcoal, on the other hand, does not vapourise and so does not produce a flame.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why some substances burn with a flame while as some burn without a flame?

What is the third statement of this audio clip?

The substances which vapourise during burning, give flames.

For example, kerosene oil and molten wax rise through the wick and are vapourised during burning and form flames.

Charcoal, on the other hand, does not vapourise and so does not produce a flame.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are the conditions necessary for combustion to take place? What is the first statement of this audio clip?

                              

Presence of a combustible substance (fuel)

Presence of air or oxygen

Heating the combustible substance to its ignition temperature

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are the conditions necessary for combustion to take place? What is the second statement of this audio clip?

                              

Presence of a combustible substance (fuel)

Presence of air or oxygen

Heating the combustible substance to its ignition temperature

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are the conditions necessary for combustion to take place? What is the three statement of this audio clip?

                              

Presence of a combustible substance (fuel)

Presence of air or oxygen

Heating the combustible substance to its ignition temperature

7.

OPEN ENDED QUESTION

3 mins • Ungraded

In an experiment 4.5 kg of a fuel was completely burnt. The heat produced was measured to be 180,000 kJ. Calculate the calorific value of the fuel.

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