Fuels and batteries

Question 1

which two elements do most fuels contain?

Answer 1

Hydrogen (H) and carbon (C)

Question 2

What is another word for burning?

Answer 2

Combustion

Question 3

Is burning an exothermic or endothermic reaction?

Answer 3

Exothermic. It releases energy to the surroundings.

Question 4

What are the products of burning hydrocarbon fuels?

Answer 4

Carbon Dioxide and water. The carbon in the fuel combines with oxygen to make CO₂ and the Hydrogen in the fuel combines with oxygen to make H₂O

Question 5

What impurity in fuels makes acid rain?

Answer 5

Sulfur. It burns to produce SO₂, which dissolves in rainwater, making it acidic.

Question 6

Which product of burning fuels causes the “greenhouse effect”?

Answer 6

Carbon dioxide. (CO₂)

Question 7

Balance the equation for combustion of methane

CH₄ + __ O₂ ⇒ ___ CO₂ + __ H₂O

Answer 7

CH₄ + 2O₂ **⇒ **CO₂ + 2H₂O

Question 9

Draw the displayed structure of methane CH₄

Answer 9

H

H—C—H

H

Unfortunatly I don´t quite have the hang of this yet! There should be two more lines, joining the C to the other two H atoms.

!