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Lesson 2.2 Why a Pennsylvania Town has been Burning for 60 Years

Last updated 7 months ago
21 questions
1

What caused the eerie silence in the town of Centralia?

1

What is subsidence in the context of the article?

2

Why is a fire inside a mine so dangerous to the people who live near by?

1

The carbon content is the percentage of the mass of carbon in the sample of coal. Which type of coal has the most carbon in it?

2
The heat of combustion is the _______ released when the fuel reacts with _______ .
1

Which fuel has the highest heat of combustion?

1

Coal is the only fuel that does not have water (H₂O) as a product of combustion. Why do you think that is true?

2
The heat released from burning coal is produced because new _______ are formed when the _______ is made.
1
An exothermic reaction is a chemical reaction that _______ heat.
1
Activation energy is the energy needed to _______ a chemical reaction.
1

An example of activation energy would be

1
SO₂ is a product of the combustion of coal when the coal contains _______ .
1
A chain reaction happens when the heat of combustion is _______ the activation energy.
1

According to the tetrahedron of fire, an effective way to put out the fire might be to......

2
When oxygen (O₂) is low, a fire can produce both _______ and _______.
3
Carbon monoxide poisoning causes _______ ,_______ , and _______ .
1
Sulfur dioxide is made when the coal burns because the coal contains _______ atoms.
2
Hydrogen sulfide is made when coal burns because at high temperatures _______ and _______ react to make hydrogen sulfide.
2
An endothermic process like evaporation _______ heat from the _______
1

How long can an underground coal fire burn?

5

In the past 50 years, California has switch from using the combustion of coal to the combustion of methane to generate electricity. What are the advantages of using methane as a fuel rather than coal. For full credit, you must use evidence from the article to support you answer.