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

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21 Nsɛmmisa

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21.

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.

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1.

What caused the eerie silence in the town of Centralia?

A government mandate

A natural disaster

Abandoned coal mines

An underground fire

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3.

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

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5.

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

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17.

Sulfur dioxide is made when the coal burns because the coal contains atoms.

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18.

Hydrogen sulfide is made when coal burns because at high temperatures and react to make hydrogen sulfide.

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19.

An endothermic process like evaporation heat from the

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2.

What is subsidence in the context of the article?

Collapse of ground due to weakened rock

The spread of the fire to neighboring towns

population decline

economic decline

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4.

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?

Lignite

Clean

Bituminous

Anthracite

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6.

Which fuel has the highest heat of combustion?

coal

octane (gasoline)

wood

methane (natural gas)

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7.

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

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8.

The heat released from burning coal is produced because new are formed when the is made.

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9.

An exothermic reaction is a chemical reaction that heat.

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10.

Activation energy is the energy needed to a chemical reaction.

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11.

An example of activation energy would be

the energy released from a hot pack

the energy needed to light a match

the energy absorbed when ice melts

the energy released when hot water cools

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12.

SO₂ is a product of the combustion of coal when the coal contains .

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13.

A chain reaction happens when the heat of combustion is the activation energy.

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14.

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

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15.

When oxygen (O₂) is low, a fire can produce both and .

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16.

Carbon monoxide poisoning causes , , and .

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20.

How long can an underground coal fire burn?

6000- 250 years

more than 6000 years

5 - 70 years

250- 70 years