Fill in the blanks.
(a) A ……….. process in which a substance reacts with ……….. to give off heat is called combustion.
(b) When the clothes of a person catch ………… the person is covered with a …………… to extinguish fire.
(c) The ………….. temperature at which a substance catches fire is called its ………….. temperature.
(d) The substances which gave very ………….. ignition temperature and can easily catch fire with a flame are called …………. substances.
(e) The substances which vaporise during …………….. give flame.
(a) A chemical process in which a substance reacts with oxygen to give off heat is called combustion.
(b) When the clothes of a person catch fire, the person is covered with a blanket to extinguish the fire.
(c) The lowest temperature at which a substance catches fire is called its ignition temperature.
(d) The substances which have very low ignition temperature and can easily catch fire with a flame are called inflammable substances.
(e) The substances which vapourise during burning give flame. 
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- Fill in the blanks using the words given in the box. ignition, petrol, combustion, calorific value, combustible, inflammable(a) A chemical process in which a substance reacts with oxygen to give off heat is called ………………(b) Wood, paper, CNG are ……………substances.(c) The lowest temperature at which a substance catches fire is called its …………… temperature.(d) Ignition temperature of……………… is lower than that of wood.(e) The substances which have very low……………… temperature and can easily catch fire with a flame are called…………….. substances.(f) The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its …………….
- Choose the correct statement about inflammable substances from the following.They have(a) low ignition temperature and cannot catch fire easily(b) high ignition temperature and can catch fire easily(c) low ignition temperature and can catch fire easily(d) high ignition temperature and cannot catch fire easily
- If a person’s clothes catch fire, the best way to extinguish the fire is to(a) throw water on the clothes(b) use fire extinguisher(c) cover the person with a woolen blanket(d) cover the person with a polythene sheet
- Complete the crossword with the help of the clues.Across1. Non-metal which catches fire if exposed to air. (10)3. The lowest temperature at which a substance catches fire is called its …………. temperature. (8)5. The most common fire extinguisher. (5)Down2. A chemical process in which a substance reacts with oxygen to give off heat. (10)4. Petrol is used as a ………….. in automobiles. (4)6. It is as hard as stone and black in colour. (4)"
- Which substances burn with a flame?
- Write True/False against the following statements and also correct the false statement.(a) A physical process in which a substance reacts with oxygen to give off heat is called combustion.(b) Water is the best extinguisher for fires involving electrical equipment.(c) Alcohol, CNG and LPG are inflammable substances.(d) Increased concentration of nitrogen in air is believed to cause global warming.(e) Greater the calorific value, better is the fuel.(f) Middle zone is the hottest zone of a flame.(g) The substances which vaporise during burning, give flame.
- A substance which reacts with oxygen giving heat is called a combustible substance. Which one of the following is a combustible substance?Iron nailGlassStone pieceWood
- When a lot of dry powder of a substance X is released over a fire, the fire gets extinguished.(a) Name the substance X.(b) How does this substance extinguish the fire?(c) Name another substance which behaves like X.
- When the clothes of a person catches fire, we cover him with a blanket. Why?
- Fill in the blanks with suitable words:(a)Â The addition of oxygen to a substance is called _______Â whereas removal of oxygen is called ________.(b)Â The addition of hydrogen to a substance is called _______Â whereas removal of hydrogen is called ________.
- If you see a person whose clothes are on fire, how will you extinguish the fire? Give a reason for your answer.
- When water is heated to a temperature x, it gets converted into steam at temperature x by a process called R. And when steam at temperature x is cooled, it gets reconverted into water at the same temperature x by a process called S.(a) How much is the value of x in Kelvin?(b) What is the process R called?(c) What is the name of the energy absorbed during the process R?(d) What is process S known as?(e) What is the name of energy released during the process S known as?
- Why do different substances catch fire at different temperatures?
- A substance which dissolves in a solvent is called? What is an Immiscible Liquid? Give examples.
- When water is cooled to a temperature x, it gets converted into ice at temperature x by a process called P. And when ice at temperature x is warmed, it gets reconverted into water at the same temperature x in a process called Q.(a) What is the value of temperature x in Kelvin?(b) What is the process P known as?(c) What is the name of energy released during process P?(d) What is the process Q known as?(e) What is the name of energy absorbed during process Q?
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