1. List condition under which combustion can take place. ( presence of oxygen, presence of fuel and heat to raise the temperature of fuel beyond its ignition temperature)
2. Can the process of rusting be called combustion.
3. Write down an activity to prove that air is essential for burning.
4. What is ignition temperature.
5. What are inflammable substance.
Answers
Answer:
2: no because no heat and light is produced
3:Take a candle and fix it on a table. The candle is lighted. The candle will continue to burn due to continuously available fresh air providing the required oxygen for combustion.
Now cover the burning candle by putting an inverted gas jar over it. After a short time, the candle stops burning and gets extinguished. When the burning candle is covered with gas jar, then the candle takes away the oxygen necessary for burning from the air enclosed in the gas jar. After some time, when all the oxygen of air inside the gas jar is used up, then the burning candle gets extinguished. This proves that air is necessary for combustion of substances.
4:Definition of ignition temperature. : the lowest temperature at which a combustible substance when heated (as in a bath of molten metal) takes fire in air and continues to burn. — called also autogenous ignition temperature.
5:Inflammable substance: The substances which have very low ignition temperature and can easily catch fire with a flame are called inflammable substances. Examples of inflammable substances are petrol, alcohol, Liquefied Petroleum Gas (LPG), etc.
Explanation:hope u like and ans 1 is already answered by you.
Answer: 1.no, since neither heat or light is generated.
2: Place a candle on the table. The candle has been lit. Due to the constant availability of fresh air, which provides the necessary oxygen for combustion, the candle will continue to burn.
Explanation:
Step :1 Now place an upside-down gas container on top of the burning candle to cover it. The candle eventually runs out of fuel and is put out. When a burning candle is covered by a gas jar, the gas jar's confined air loses oxygen as a result of the candle's use of it. The blazing candle eventually goes out after a while after all the oxygen in the air inside the gas jar has been consumed. This demonstrates that air is required for chemical combustion.
Step :2 Definition of ignition temperature (also known as autogenous ignition temperature): It is the lowest temperature at which a combustible substance ignites in air and continues to burn when heated (such as in a bath of molten metal).
5: Combustible substances: Substances with very low.
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