Standard 7: Chapter 1: Scientific Experiments (Easy)
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Questions and Answers

What type of fire is referred to as Class F fire?

  • Fires involving gases
  • Electrical fires
  • Fires involving cooking oil (correct)
  • Fires caused by flammable solids

    • Water is a safe extinguishing agent for Class F fires.

    False

    What should be done before attempting to extinguish a fire caused by electrical faults?

    Turn off the main electrical switch

    Class F fire is extinguished using __________ gas or dry powder.

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

    Match the following fire extinguishing agents with their suitable fire types:

    <p>Carbon dioxide = Class F fire Dry powder = Electrical fires Dry sand = Electrical fires Water = Cannot be used on electrical fires</p> Signup and view all the answers

    Which method is NOT advised when dealing with electrical fires?

    <p>Using water before switching off the main switch</p> Signup and view all the answers

    Dry sand can be used to extinguish electrical fires.

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

    List one of the steps in using carbon dioxide for firefighting.

    <p>Remove the safety pin</p> Signup and view all the answers

    To properly use an extinguisher, you should aim at the __________ of the fire.

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

    Which extinguishing agent should be used if the main electrical switch cannot be turned off?

    <p>Dry powder</p> Signup and view all the answers

    What is the aim of the experiment?

    <p>To determine the properties of bases</p> Signup and view all the answers

    The red litmus paper turns blue in the presence of a base.

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

    What materials are used to conduct the experiment?

    <p>Ashes or dry banana leaves, chalk or lime, gallbladder, beaker, glass or plastic bottle, bowl, beef fat, water, and filter paper.</p> Signup and view all the answers

    The red litmus paper changed its colour to ________ after being dipped in the base solution.

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

    Match the following materials with their purpose in the experiment:

    <p>Ashes = Used to create a solution for testing Beef fat = Substance to observe breakdown by base Bile = Alternative to test base properties Litmus paper = Indicates pH change in solutions</p> Signup and view all the answers

    What is the purpose of pouring oil into beaker A?

    <p>To create a barrier against rust</p> Signup and view all the answers

    Beaker B requires oil to be added to achieve the experiment's goals.

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

    How long should the sufuria or beakers be left before observations are made?

    <p>Three days</p> Signup and view all the answers

    Beaker C should be dried using a _____ after the water is added.

    <p>dry cloth</p> Signup and view all the answers

    Match the beaker with its treatment:

    <p>Beaker A = Contains oil to cover the water Beaker B = Does not contain oil Beaker C = Dry before placing nails All beakers = Should hold at least 80 millilitres of water</p> Signup and view all the answers

    What should be done to the nails before placing them in beaker C?

    <p>They should be dried</p> Signup and view all the answers

    After boiling, the water in all beakers should be replaced with cold water.

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

    What is the first step to prepare for the experiment described?

    <p>Label three beakers A, B, and C and add at least 80 millilitres of water to beakers A and B.</p> Signup and view all the answers

    Which substance is expected to rust in the experiment?

    <p>Iron nails</p> Signup and view all the answers

    All materials in the experiment rust when dipped in water.

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

    What should you be cautious of when handling iron nails and rods?

    <p>They can cause harm and health problems.</p> Signup and view all the answers

    In the experiment, materials that did not rust were left __________ the water.

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

    Match the materials with their expected outcomes regarding rust:

    <p>Iron nails = Rust Brass keys = No rust Plastic material = No rust Stainless steel spoon = No rust</p> Signup and view all the answers

    What is the aim of Experiment 6?

    <p>To determine the conditions necessary for rusting</p> Signup and view all the answers

    Oil or grease can help prevent rusting of iron.

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

    What is one material used in Experiment 5 that is expected to rust?

    <p>Iron rod</p> Signup and view all the answers

    The iron nails were placed in __________ to observe rusting.

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

    How long were the materials left in an open area after being dipped in water?

    <p>Three days</p> Signup and view all the answers

    Which type of fire should not be extinguished using carbon dioxide gas?

    <p>Class A fire</p> Signup and view all the answers

    Carbon dioxide gas effectively removes oxygen, allowing fires to be extinguished permanently.

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

    What should be done before extinguishing a fire caused by an electrical fault?

    <p>Switch off the main switch.</p> Signup and view all the answers

    Fire extinguishers should be available in __________.

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

    Match the following firefighting methods with their appropriate description:

    <p>Dry powder = Used for Class B fires (flammable liquids) Water = Commonly used for Class A fires (ordinary combustibles) Fire blanket = Used to smother small fires Fire extinguisher = Portable device to discharge extinguishing agents</p> Signup and view all the answers

    What is the recommended action if a fire occurs in your area?

    <p>Scream, ring a bell, or press the fire alarm</p> Signup and view all the answers

    Creating firebreaks around fields and forests is not necessary for firefighting.

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

    What phone number should be called to contact the Fire and Rescue Force?

    <p>114</p> Signup and view all the answers

    When using a fire extinguisher, it is important to choose the __________ firefighting equipment for the appropriate class of fire.

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

    Study Notes

    Experiment 5: Examining Rusting

    • Experiment aims to determine which substances rust.
    • Iron nails and iron rods rust while plastic, stainless steel and brass do not.
    • Materials: water, iron nails, stainless steel or brass keys, a piece of plastic material, a piece of iron rod, stainless steel or brass spoons, bowl.
    • Caution: Be careful while handling iron nails and iron rods as they can cause harm.

    Experiment 6: Conditions Necessary For Rusting

    • Experiment aims to determine conditions necessary for rusting of iron nails.
    • Iron rusts in the presence of water and air(oxygen).
    • Oil or grease act as a protective layer, preventing rusting.

    Firefighting

    • Class F fire involves cooking oil, extinguish using carbon dioxide gas or dry powder.
    • Electrical fault is not a class of fire, but it can cause Class A, B, C, D or F fires.
    • Extinguish fire based on material type with dry powder, carbon dioxide gas, or dry sand.
    • Switch off the main electrical switch before extinguishing a fire caused by electrical fault.
    • Do not use water before turning off the main switch because water conducts electricity.
    • Steps in firefighting using carbon dioxide gas or dry powder:
      • Remove safety pin
      • Hold the discharge hose and target the base of the fire
      • Squeeze lever to release the extinguishing agent
      • Sweep from side to side until fire is extinguished.
    • Fire extinguishers, fire blankets and water are used to extinguish fire at initial stages.
    • Fully developed fire is extinguished by firefighters using special equipment.
    • Firebreaks around fields and forests should be created.
    • Buildings need fire extinguishers and lightning conductors for safety.
    • In case of fire, scream, ring a bell, or press the fire alarm and call the Fire and Rescue Force on 114 to save lives and properties.

    Experiment 4: Properties of Bases

    • Experiment aims to identify properties of bases.
    • Materials: ashes or dry banana leaves, chalk or lime, gallbladder, beaker, glass or plastic bottle, bowl, beef fat, water, filter or filter paper, and blue litmus paper and red litmus paper.
    • Caution: Ashes, dry banana leaves, bile, and lime can cause health effects.
    • Bases change the colour of red litmus paper to blue.
    • Bases break down beef fat.

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