Chem 219: Module 2 EXAM (2025/2026) Updated: EXAM QUESTIONS WI
ACCURATE ANSWERS | GET IT RIGHT!!
1. What are hydrocarbons? Molecules composed of
only the elements carbon
and hydrogen
2. What are the two major classes of hydrocarbons? Aromatic (benzene) and
aliphatic (alkanes, alkenes,
alkynes)
3. What is the main source of hydrocarbons? Fossil fuels like coal, pe-
troleum, and natural gas
obtained by mining and
drilling.
4. What are Alkanes? They are saturated hy-
drocarbons because their
skeleton is only composed
of C-C single bonds.
5. How can alkanes exist? They can be linear,
branched or exist in
ring formations called cy-
cloalkanes.
6. Describe a higher/more complex alkane structure: They will have more car-
bons and/or increased
structural diversity.
7. What is the general formula of Alkanes? CnH2n+2
, Chem 219: Module 2 EXAM (2025/2026) Updated: EXAM QUESTIONS WI
ACCURATE ANSWERS | GET IT RIGHT!!
8. The names of the alkanes reflect? The number of carbons
present.
9. How many isomers does each alkane have from 1-10 1,1,1,2,3,5,9,18,35,75
10. Name the first ten prefix of alkanes: Methane, ethane, propane,
butane, pentane, hexane,
heptane, octane, nonane,
decane.
11. As the molecular weight increases: The number of isomers in-
crease.
12. What does the suffix -ane mean?
, Chem 219: Module 2 EXAM (2025/2026) Updated: EXAM QUESTIONS WI
ACCURATE ANSWERS | GET IT RIGHT!!
Denotes a saturated hydro-
carbon. It is used for all
acyclic saturated alkanes
13. What is nomenclature? The naming of a molec-
ular structure. Historically
they were named after their
source, now they are sys-
temic.
14. Why is nomenclature important? Because we cannot re-
member all the prefixes
since a MF composed of
carbons can have several
different patterns of con-
nectivity.
15. What is it meant by the systemic approach? There are now methods of
naming molecules so that
they all have unique names.
You can then determine
the structure from only the
name and vice-versa.
16. IUPAC rules for naming branced alkanes: 1. Find the parent name by
identifying the longest con-
tinuous chain of carbons.
2. Number the parent
chain. (begin at the end of
the chain nearest to the first
branch.)
3. If there are two equal-
ACCURATE ANSWERS | GET IT RIGHT!!
1. What are hydrocarbons? Molecules composed of
only the elements carbon
and hydrogen
2. What are the two major classes of hydrocarbons? Aromatic (benzene) and
aliphatic (alkanes, alkenes,
alkynes)
3. What is the main source of hydrocarbons? Fossil fuels like coal, pe-
troleum, and natural gas
obtained by mining and
drilling.
4. What are Alkanes? They are saturated hy-
drocarbons because their
skeleton is only composed
of C-C single bonds.
5. How can alkanes exist? They can be linear,
branched or exist in
ring formations called cy-
cloalkanes.
6. Describe a higher/more complex alkane structure: They will have more car-
bons and/or increased
structural diversity.
7. What is the general formula of Alkanes? CnH2n+2
, Chem 219: Module 2 EXAM (2025/2026) Updated: EXAM QUESTIONS WI
ACCURATE ANSWERS | GET IT RIGHT!!
8. The names of the alkanes reflect? The number of carbons
present.
9. How many isomers does each alkane have from 1-10 1,1,1,2,3,5,9,18,35,75
10. Name the first ten prefix of alkanes: Methane, ethane, propane,
butane, pentane, hexane,
heptane, octane, nonane,
decane.
11. As the molecular weight increases: The number of isomers in-
crease.
12. What does the suffix -ane mean?
, Chem 219: Module 2 EXAM (2025/2026) Updated: EXAM QUESTIONS WI
ACCURATE ANSWERS | GET IT RIGHT!!
Denotes a saturated hydro-
carbon. It is used for all
acyclic saturated alkanes
13. What is nomenclature? The naming of a molec-
ular structure. Historically
they were named after their
source, now they are sys-
temic.
14. Why is nomenclature important? Because we cannot re-
member all the prefixes
since a MF composed of
carbons can have several
different patterns of con-
nectivity.
15. What is it meant by the systemic approach? There are now methods of
naming molecules so that
they all have unique names.
You can then determine
the structure from only the
name and vice-versa.
16. IUPAC rules for naming branced alkanes: 1. Find the parent name by
identifying the longest con-
tinuous chain of carbons.
2. Number the parent
chain. (begin at the end of
the chain nearest to the first
branch.)
3. If there are two equal-
