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Choose the correct answer.

1)Two elements, hydrogen and … make up a hydrocarbon.
a) oxygen
b) carbon
c) no correct variant

2. What is the simplest hydrocarbon?
a) oxygen
b) carbon
c) methane
d) no correct variant

3. What is the pressure the atmosphere exerts at sea level?
a) low pressure
b) normal pressure
c) high pressure
d) no correct variant

4. What is the main component of natural gas?
a) carbon
b) methane
c) oxygen
d) no correct variant

5. Sometimes natural gas also contains nonhydrocarbon gases and liquids such as
helium, carbon dioxide, nitrogen, and …
a) oil
b) water
c) carbon
d) no correct variant

6. What elements may often occur with natural gas?
a) ethane, propane, and butane
b) oxygen and carbon
c) methane and carbon
d) no correct variant

7. How do oil companies call crude oil that contains hydrogen sulfide?
a) “bitter crude”
b) “sour crude”
c) “sweet crude”
d) no correct variant

8. How do oil companies call crude oil that does not contain hydrogen sulfide?
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