Combustion and Fire Control Basics
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Questions and Answers

What substance does magnesium burn to produce during combustion?

  • Water vapor
  • Oxygen
  • Magnesium oxide (correct)
  • Carbon dioxide (correct)

    • Charcoal does not burn in air.

    False

    What is a characteristic of a substance that acts as a fuel?

    It gives off heat during combustion.

    During combustion, charcoal produces __________, heat, and light.

    <p>carbon dioxide</p> Signup and view all the answers

    Match the combustion reactions with their products:

    <p>Magnesium = Magnesium oxide Charcoal = Carbon dioxide Coal = Carbon dioxide Hydrogen = Water vapor</p> Signup and view all the answers

    Which material listed is not a combustible substance?

    <p>Glass</p> Signup and view all the answers

    Charcoal is an example of a combustible substance.

    <p>True</p> Signup and view all the answers

    What is the definition of combustion?

    <p>A chemical process in which a substance reacts with oxygen to give off heat.</p> Signup and view all the answers

    ___ is a fuel for our bodies.

    <p>Food</p> Signup and view all the answers

    Match the combustible substances with their state of matter:

    <p>Wood = Solid Kerosene oil = Liquid Charcoal = Solid Iron nails = Solid</p> Signup and view all the answers

    What was used as matches in ancient Egypt over five thousand years ago?

    <p>Dipped pinewood</p> Signup and view all the answers

    Modern safety matches were developed over five hundred years ago.

    <p>False</p> Signup and view all the answers

    What is the purpose of pouring water in one of the paper cups during the procedure?

    <p>To compare the effects of heating</p> Signup and view all the answers

    What is the lowest temperature at which a substance catches fire called?

    <p>ignition temperature</p> Signup and view all the answers

    The procedure requires using two different types of heating sources.

    <p>False</p> Signup and view all the answers

    A matchstick does not catch fire on its own at room temperature, but rubbing it on the side of the matchbox starts the burning process due to the matchbox's ability to raise the temperature of the tip of the matchstick beyond its __________.

    <p>ignition point</p> Signup and view all the answers

    What will likely happen to the paper cup containing water when heated with a candle?

    <p>It will not catch fire easily.</p> Signup and view all the answers

    Match the components used in the head of a modern match with their purposes:

    <p>Antimony trisulphide = Fuel for combustion Potassium chlorate = Oxidizing agent White phosphorus = Ignition starter Glue and starch = Binders for the match head</p> Signup and view all the answers

    When heating the cups, the one without water may _____ due to the high temperature.

    <p>burn</p> Signup and view all the answers

    Match the following steps to their expected observations:

    <p>Heating the cup with water = Cup remains intact Heating the empty cup = Cup may burn Using a candle = Heat source for both cups Folding a paper sheet = Making the cups</p> Signup and view all the answers

    Which of the following is considered an inflammable substance?

    <p>Petrol</p> Signup and view all the answers

    It is unnecessary to memorize the telephone number of the fire service.

    <p>False</p> Signup and view all the answers

    What is the first action you should take if a fire breaks out in your home?

    <p>Call the fire service.</p> Signup and view all the answers

    Substances that can easily catch fire are known as ______ substances.

    <p>inflammable</p> Signup and view all the answers

    Match each type of action to its fire control method:

    <p>Calling fire service = Getting immediate help Controlling air supply = Starving the fire Cooling the area = Reducing temperature Removing fuel source = Preventing escalation</p> Signup and view all the answers

    What are the essential requirements for the production of fire?

    <p>Fuel, air (oxygen), heat</p> Signup and view all the answers

    Water can help prevent the spread of fire by cutting off the supply of oxygen.

    <p>True</p> Signup and view all the answers

    What should you do immediately if a fire occurs at home?

    <p>Contact the fire service.</p> Signup and view all the answers

    One method to control fire is by removing the _____ supply.

    <p>fuel</p> Signup and view all the answers

    Match the following fire control methods with their descriptions:

    <p>Cutting off fuel = Prevents fire by eliminating a necessary component Pouring water = Cools materials below ignition temperature Using extinguishers = Lowers temperature to control fire Calling the fire service = Professional help for fire emergencies</p> Signup and view all the answers

    What type of combustion occurs when a material suddenly ignites without an obvious external cause?

    <p>Spontaneous Combustion</p> Signup and view all the answers

    Carbon dioxide (CO2) is recommended for extinguishing fires involving electrical equipment.

    <p>True</p> Signup and view all the answers

    What is the best method to extinguish a fire involving flammable materials?

    <p>carbon dioxide</p> Signup and view all the answers

    In the case of incomplete combustion, carbon dioxide (CO2) is emitted instead of ________ or ________.

    <p>baking soda, potassium bicarbonate</p> Signup and view all the answers

    Match the types of combustion with their descriptions:

    <p>Complete Combustion = Fire cannot be easily eliminated Incomplete Combustion = Emits CO2 instead of other chemicals Spontaneous Combustion = Ignition occurs without external cause</p> Signup and view all the answers

    What is one of the causes of forest fires?

    <p>Improperly extinguished campfires</p> Signup and view all the answers

    Spontaneous combustion can occur in coal mines due to coal dust.

    <p>True</p> Signup and view all the answers

    What type of reaction occurs when a cracker is ignited during a festival?

    <p>Explosion</p> Signup and view all the answers

    The flame produced by burning magnesium ribbon is typically __________ in color.

    <p>white</p> Signup and view all the answers

    Match the materials with the color of their flames:

    <p>Candle = Golden Yellow Magnesium = White Camphor = Blue Kerosene Stove = Blue Charcoal = Orange</p> Signup and view all the answers

    What is spontaneous combustion?

    <p>Combustion that occurs without any apparent cause</p> Signup and view all the answers

    Carbon dioxide can be used to extinguish fire by supplying oxygen to the flames.

    <p>False</p> Signup and view all the answers

    Name one chemical that can be used in fire extinguishers.

    <p>Sodium bicarbonate</p> Signup and view all the answers

    Combustion is a process where a substance reacts with __________, producing heat and light.

    <p>oxygen</p> Signup and view all the answers

    Match the following types of combustion with their descriptions:

    <p>Rapid combustion = Occurs quickly with the release of heat and light Spontaneous combustion = Ignition without an external cause Incomplete combustion = Produces carbon monoxide and soot Controlled combustion = Maintained under regulated conditions</p> Signup and view all the answers

    What type of substances produce flames during combustion in the experiment?

    <p>Kerosene oil and molten wax</p> Signup and view all the answers

    Charcoal produces a flame when it is burned.

    <p>False</p> Signup and view all the answers

    What is observed when a wire is held inside the non-luminous portion of a flame?

    <p>Deposition of unburnt carbonaceous particles</p> Signup and view all the answers

    Kerosene oil and molten wax produce flames by __________.

    <p>vaporizing</p> Signup and view all the answers

    Match the following substances with their combustion behavior:

    <p>Kerosene oil = Produces flames by vaporizing Wax = Produces flames by vaporizing Charcoal = Does not produce flames Non-luminous flame = Deposits unburnt carbon</p> Signup and view all the answers

    Study Notes

    Combustion

    • Combustion is a chemical process where a substance reacts with oxygen, producing heat and light.
    • A substance that undergoes combustion is combustible and also known as a fuel.
    • Magnesium and charcoal are combustible substances
    • Substances that catch fire easily due to low ignition temperatures are called inflammable substances.
    • Examples of inflammable substances include petrol, alcohol, and Liquified Petroleum Gas (LPG).
    • To control fire, remove one of the essential requirements: fuel, oxygen, or heat.

    Controlling Fire

    • Fire brigades use water to cool burning materials and prevent the spread of fire by cutting off the oxygen supply.
    • Water vapor surrounds the combustible materials, further preventing their combustion.
    • Avoid handling fire yourself. Seek help from the fire service.

    Types of Combustion

    • Complete combustion: The burning process where all fuel burns completely, producing only carbon dioxide and water.
    • Incomplete combustion: The burning process where fuel burns partially, producing carbon dioxide, carbon monoxide, and other byproducts.
    • Spontaneous combustion: The burning of a material without any evident external cause, such as heat or flame.
    • Rapid Combustion: Combustion reaction that happens very quickly, producing heat and light, often leading to an explosion.

    Fire Extinguishers

    • Carbon dioxide (CO2) is a popular fire extinguisher as it acts as a blanket, cutting off the oxygen supply and cooling the fuel.
    • Sodium bicarbonate and potassium bicarbonate are also used in fire extinguishers.

    Spontaneous Combustion and Flames

    • Spontaneous combustion of coal dust in mines can cause disastrous fires.
    • Forest fires can be caused by sunlight, lightning, and human carelessness.
    • Fireworks are a classic example of rapid combustion, producing heat, light, sound, and a large gas volume.

    Flame Observation

    • Experiment: Burning kerosene oil and wax vaporize and produce flames.
    • Charcoal does not vaporize, therefore it does not produce a flame.
    • The non-luminous zone of a candle flame contains unburnt carbonaceous particles.
    • The non-luminous zone is cooler than the luminous zone.

    Observation of Combustion

    • The text describes an experiment related to the nature of flames and different behaviors of substances during combustion.
    • It concludes that the presence of a blackened ring on a plate implies a deposition of unburned hydrocarbon materials, which are present in the non-luminous zone of the flame.

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    Description

    This quiz explores the fundamental concepts of combustion, including types of combustion and the characteristics of combustible and inflammable substances. It also covers essential fire control techniques used by fire brigades to manage and extinguish fires effectively.

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