Class 8 Exam > Class 8 Videos > Combustion - Why is Oxygen necessary for Combustion, Class 8 Science
Combustion - Why is Oxygen necessary for Combustion, Class 8 Science Video Lecture
FAQs on Combustion - Why is Oxygen necessary for Combustion, Class 8 Science Video Lecture
| 1. Why is oxygen necessary for combustion? |  |
Ans. Oxygen is necessary for combustion because it acts as the oxidizing agent. During combustion, a fuel reacts with oxygen to release energy in the form of heat and light. Oxygen molecules break down the fuel molecules, allowing them to combine with oxygen atoms and release energy. Without oxygen, the fuel cannot undergo the necessary chemical reaction to produce combustion.
| 2. What happens if there is no oxygen during combustion? | |
Ans. If there is no oxygen during combustion, the fuel will not be able to react with an oxidizing agent, and therefore, combustion will not occur. Without oxygen, the necessary chemical reaction to release energy in the form of heat and light cannot take place. The absence of oxygen will prevent the fuel from undergoing combustion.
| 3. Can any other gas replace oxygen in combustion? | |
Ans. Oxygen is the most common gas used in combustion reactions as it is highly reactive and readily available in the Earth's atmosphere. While other gases can support combustion to some extent, they might not provide the same level of energy release. For example, some halogens like chlorine and fluorine can support combustion but are generally not used due to their reactivity and potential hazards. Therefore, oxygen is the preferred gas for combustion due to its abundance and efficiency.
| 4. How does oxygen support the combustion of fuels? | |
Ans. Oxygen supports the combustion of fuels by acting as the oxidizing agent. When a fuel reacts with oxygen, the oxygen molecules break down the fuel molecules, allowing them to combine with oxygen atoms. This chemical reaction releases energy in the form of heat and light. The oxygen atoms combine with the carbon and hydrogen atoms present in the fuel, forming carbon dioxide and water vapor respectively. This release of energy is what we observe as combustion.
| 5. Can combustion occur in the absence of oxygen? | |
Ans. No, combustion cannot occur in the absence of oxygen. Oxygen is essential for the process of combustion as it enables the fuel to react and release energy. Without oxygen, the fuel cannot undergo the necessary chemical reaction to produce combustion. However, certain substances like metals can undergo combustion in the presence of other oxidizing agents, such as chlorine or fluorine. But in general, oxygen is the primary gas required for most combustion reactions.
Text Transcript from Video
do you think oxygen is essential for
combustion let's perform an activity and
guess it out fix three burning candles
on a table and covered them with glasses
whose bases have been removed now put
the glass over the first candle in such
a manner that it rests on two wooden
blocks as you can see on the screen
place the glass over the second candle
in such a manner that it simply rests on
the table and place a glass plate over
the third candle there you go now what
do you observe you will observe that the
candle burns freely in the first case
what happens in the second case the
flame flickers and produces more smoke
before going off and what about the
third case in the third case the flame
goes off as soon as it is covered with
the glass plate so we can say that the
presence of air or oxygen is an
essential requirement for combustion to
take place
combustion let's perform an activity and
guess it out fix three burning candles
on a table and covered them with glasses
whose bases have been removed now put
the glass over the first candle in such
a manner that it rests on two wooden
blocks as you can see on the screen
place the glass over the second candle
in such a manner that it simply rests on
the table and place a glass plate over
the third candle there you go now what
do you observe you will observe that the
candle burns freely in the first case
what happens in the second case the
flame flickers and produces more smoke
before going off and what about the
third case in the third case the flame
goes off as soon as it is covered with
the glass plate so we can say that the
presence of air or oxygen is an
essential requirement for combustion to
take place
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Nov 15, 2024 Last updated |
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