2.4 Burning Organic Molecules

Front

Many cars burn gasoline in their engines in order to let the car move. Based on what we have learned so far, what types of molecules are in gasoline and why do they burn?

Back

Gasoline contains organic molecules, which burn because they react with oxygen to release energy.

Front

What happens to two molecules of butane (C₄H₁₀) gas when burned with oxygen (O₂)?

Back

They combine with 13 molecules of oxygen to form carbon dioxide and water.

Front

This model shows butane being burned. What molecules were made after butane burned?

Back

Carbon dioxide and water

Front

What happens to the hydrogen atoms that were in butane as it is burned?

Back

They combine with oxygen to form water.

Front

This model shows a molecule of ethane. Assuming there are plenty of oxygen atoms around, how many molecules of carbon dioxide (CO₂) could one ethane molecule help make if it were burned?

Back

2

Front

We burn coal to generate electricity. Where do the atoms from the coal go when that coal has all been used up?

Back

The coal molecules rearrange into different molecules and go into the air.

Front

This model shows butane combusting (being burned). According to the model, what molecules are made after butane burns?

Back

Carbon dioxide (CO₂) and water (H₂O)

Front

This is an energy conservation diagram showing the combustion (burning) of the organic molecule octane. Which of the following would NOT be a reasonable choice for the energy indicators labeled A-F on this model? B = Temp. of air, E = Light of reaction, A = Chemical reaction of octane, D = Mass of octane

Back

D = Mass of octane