Working of a Matchstick

Q.

Which chemical is used to make an auto fire or match stick burner from some distance?

Q.

Define rapid combustion

Q. What is rapid combustion and spontaneous combustion?

Q. A matchstick burns on rubbing it on the side of the matchbox.

Q.

During a chemical change, energy is either evolved or absorbed. In which form is this energy seen?

Q.

How does a matchstick light up?

1. Friction heats the phosphorus when struck against a rough surface.

2. Friction heats the wood.

3. Scratching the bulb exposes its reactive part.
4. Friction heats the potassium chlorate in the bulb.

Q. How do matchsticks work? Explain the compounds used and their function.

Q. When a cracker is ignited, a sudden reaction takes place with the evolution of heat, light and sound. Identify the type of combustion?

1. Explosion
2. Random combustion
3. Rapid combustion
4. Spontaneous combustion

Q.

Cooking of food is a___________ (exothermic/endothermic) chemical change?

Q. Can a matchstick catch fire on its own?

1. Yes
2. No

Q. The type of combustion in which a material suddenly bursts into flames without the application of any apparent cause is called _____.

1. spontaneous combustion
2. slow combustion
3. rapid combustion
4. explosion

Q. The combustion reaction which occurs on its own, without any external supply of heat is called as:

1. Rapid combustion
2. Spontaneous combustion
3. Fire
4. Explosion

Q.

Write T for true and F for false statements.

When common salt dissolves in water, heat is evolved.

1. True
2. False

Q. The middle part of the flame undergoes partial combustion.

1. True
2. False

Q.

Phosphorus is highly inflammable; in a matchstick, it ignites by ___ .

1. It sublimes.

2. It turns into a liquid.

3. It starts burning.

4. It changes wood into a fuel.

Q.

What is the function of potassium chlorate in a matchstick bulb?

1. The friction generates heat.

2. Rubbing causes chemicals to combine.

3. Friction removes the bulb so that the wood can start burning.

4. Friction breaks the stick.

Q. Substance 'X' suddenly bursts into flames at room temperature, while substance 'Y' burns after a prolong heating. Which of the following are true about 'X' and 'Y'?

1. Substance 'X' goes spontaneous combustion
2. Substance 'Y' goes spontaneous combustion
3. Ignition temperature of 'X' is less than 'Y'
4. Ignition temperature of 'X' is more than 'Y'

Q.

What is the function of potassium chlorate in a matchstick bulb?

1. Friction removes the bulb so that the wood can start burning.

2. The friction generates heat.

3. Rubbing causes chemicals to combine.

4. Friction breaks the stick.

Q. Phosphorus is ignited in a matchstick due to .

1. convection
2. conduction
3. diffusion
4. friction

Q. Select the options that are needed for a matchstick to burn.

1. Oxygen
2. Wood
3. Chemical
4. Friction

Q.

Phosphorus is highly inflammable; in a matchstick, it ignites by:

1. It turns into a liquid.

2. It changes wood into a fuel.

3. It starts burning.

4. It sublimes.

Q. I actually wanted a perfect definition for the three types of combustion!

Q.

Heat is released in an exothermic change.

1. True
2. False

Q. The combustion reaction which occurs on its own, without any external supply of heat is called as:

1. Rapid combustion
2. Spontaneous combustion
3. Explosion
4. Fire

Q. The striking surface of a matchbox is mainly made up of ________.

1. argon
2. sodium
3. potassium
4. phosphorus

Q.

Identify the error in the given statements. Circle the incorrect word and write the correct word in the blank.

A change in which heat is absorbed is called an exothermic change. ____________

Q.

What is the function of potassium chlorate in a matchstick bulb?

1. It gives oxygen for combustion.

2. It increases heat.

3. It increase volume.

4. It provides pressure.

Q. A material when burnt gives out flame because of _________.

1. Conductivity
2. vaporization
3. Melting
4. Combustibility

Q. State the difference between spontaneous and rapid combustion

Q.

Phosphorus is highly inflammable; in a matchstick, it ignites by:

1. Sublimation

2. Melting

3. Changing wood into a fuel

4. Friction