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CSEE (Form 4) Air, Combustion, Rusting and Fire Fighting — practice questions

Explore 10 free Air, Combustion, Rusting and Fire Fighting questions in CSEE (Form 4) Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Air, Combustion, Rusting and Fire Fighting questions and exercises with answers

Showing questions 1–10 of 10.

What are the three components of fire?Read the answer and worked solution →Why is nitrogen collected first during the fractional distillation of liquid air?Read the answer and worked solution →Catch the fire triangleRead the answer and worked solution →Order fractional distillation of airRead the answer and worked solution →Which set of materials can cause a fire outbreak?Read the answer and worked solution →A fire in the vapour-air mixture above a flammable liquid belongs to which class?Read the answer and worked solution →Class D fires involve burning:Read the answer and worked solution →Match the fire class to its fuelRead the answer and worked solution →Catch the fire triangleRead the answer and worked solution →Fire safety, true or falseRead the answer and worked solution →

Worked practice questions

What are the three components of fire?

  1. Match box, fire wood and kerosene
  2. Oxygen, fuel and heat together
  3. Oxygen, a match box and fire wood
  4. Match box, fire wood and oxygen
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Correct answer: B. Oxygen, fuel and heat together

1. Fire needs three things present together, often called the fire triangle. 2. Those are oxygen to support burning, fuel to burn, and heat to start and sustain it. 3. Remove any one of the three and the fire goes out, which is the principle behind every extinguisher. 4. Fire wood is a type of fuel, so naming both is naming one component twice while leaving heat missing. 5. A match box is only a means of supplying heat, not a component of the fire itself. _Source: NECTA CSEE 2022 Chemistry 032, Question 1: Multiple Choice Items, item (ix)_

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Why is nitrogen collected first during the fractional distillation of liquid air?

  1. It has a low melting point
  2. It has a high boiling point
  3. It has a low density value
  4. It has a low boiling point
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Correct answer: D. It has a low boiling point

1. Air is a mixture of miscible components whose boiling points lie close together. 2. Simple distillation cannot separate them, so fractional distillation is used. 3. In fractional distillation the component with the lowest boiling point boils off first. 4. Nitrogen has a lower boiling point than the other main components of air, so it comes off first. 5. Density plays no part here, and melting point governs freezing rather than distillation. _Source: NECTA CSEE 2022 Chemistry 032, Question 1: Multiple Choice Items, item (x)_

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Catch the fire triangle

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Items
  1. Matches the category
    Yes
    Item
    Oxygen
  2. Matches the category
    Yes
    Item
    Fuel
  3. Matches the category
    Yes
    Item
    Heat
  4. Matches the category
    Yes
    Item
    Air supply
  5. Matches the category
    No
    Item
    Match box
  6. Matches the category
    No
    Item
    Chimney
  7. Matches the category
    No
    Item
    Ash tray
Category
Component of fire
Instructions
Catch the three things fire needs. Let the rest fall.

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