Chem 219 Module 2 2026 Exam
Questions with 100% Correct
Answers | Latest Update
What are hydrocarbons? - 🧠 ANSWER ✔✔Molecules composed of only the
elements carbon and hydrogen
What are the two major classes of hydrocarbons? - 🧠 ANSWER
✔✔Aromatic (benzene) and aliphatic (alkanes, alkenes, alkynes)
What is the main source of hydrocarbons? - 🧠 ANSWER ✔✔Fossil fuels
like coal, petroleum, and natural gas obtained by mining and drilling.
,What are Alkanes? - 🧠 ANSWER ✔✔They are saturated hydrocarbons
because their skeleton is only composed of C-C single bonds.
How can alkanes exist? - 🧠 ANSWER ✔✔They can be linear, branched or
exist in ring formations called cycloalkanes.
Describe a higher/more complex alkane structure: - 🧠 ANSWER ✔✔They
will have more carbons and/or increased structural diversity.
What is the general formula of Alkanes? - 🧠 ANSWER ✔✔CnH2n+2
The names of the alkanes reflect? - 🧠 ANSWER ✔✔The number of carbons
present.
How many isomers does each alkane have from 1-10 - 🧠 ANSWER
✔✔1,1,1,2,3,5,9,18,35,75
Name the first ten prefix of alkanes: - 🧠 ANSWER ✔✔Methane, ethane,
propane, butane, pentane, hexane, heptane, octane, nonane, decane.
As the molecular weight increases: - 🧠 ANSWER ✔✔The number of
isomers increase.
What does the suffix -ane mean? - 🧠 ANSWER ✔✔Denotes a saturated
hydrocarbon. It is used for all acyclic saturated alkanes
, What is nomenclature? - 🧠 ANSWER ✔✔The naming of a molecular
structure. Historically they were named after their source, now they are
systemic.
Why is nomenclature important? - 🧠 ANSWER ✔✔Because we cannot
remember all the prefixes since a MF composed of carbons can have
several different patterns of connectivity.
What is it meant by the systemic approach? - 🧠 ANSWER ✔✔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.
IUPAC rules for naming branced alkanes: - 🧠 ANSWER ✔✔1. Find the
parent name by identifying the longest continuous 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 equally long continuous chains, select the one with most
branches.
4. If the first branch point is the same distance, choose the one that gives
the lowest substituents.
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
3
Questions with 100% Correct
Answers | Latest Update
What are hydrocarbons? - 🧠 ANSWER ✔✔Molecules composed of only the
elements carbon and hydrogen
What are the two major classes of hydrocarbons? - 🧠 ANSWER
✔✔Aromatic (benzene) and aliphatic (alkanes, alkenes, alkynes)
What is the main source of hydrocarbons? - 🧠 ANSWER ✔✔Fossil fuels
like coal, petroleum, and natural gas obtained by mining and drilling.
,What are Alkanes? - 🧠 ANSWER ✔✔They are saturated hydrocarbons
because their skeleton is only composed of C-C single bonds.
How can alkanes exist? - 🧠 ANSWER ✔✔They can be linear, branched or
exist in ring formations called cycloalkanes.
Describe a higher/more complex alkane structure: - 🧠 ANSWER ✔✔They
will have more carbons and/or increased structural diversity.
What is the general formula of Alkanes? - 🧠 ANSWER ✔✔CnH2n+2
The names of the alkanes reflect? - 🧠 ANSWER ✔✔The number of carbons
present.
How many isomers does each alkane have from 1-10 - 🧠 ANSWER
✔✔1,1,1,2,3,5,9,18,35,75
Name the first ten prefix of alkanes: - 🧠 ANSWER ✔✔Methane, ethane,
propane, butane, pentane, hexane, heptane, octane, nonane, decane.
As the molecular weight increases: - 🧠 ANSWER ✔✔The number of
isomers increase.
What does the suffix -ane mean? - 🧠 ANSWER ✔✔Denotes a saturated
hydrocarbon. It is used for all acyclic saturated alkanes
, What is nomenclature? - 🧠 ANSWER ✔✔The naming of a molecular
structure. Historically they were named after their source, now they are
systemic.
Why is nomenclature important? - 🧠 ANSWER ✔✔Because we cannot
remember all the prefixes since a MF composed of carbons can have
several different patterns of connectivity.
What is it meant by the systemic approach? - 🧠 ANSWER ✔✔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.
IUPAC rules for naming branced alkanes: - 🧠 ANSWER ✔✔1. Find the
parent name by identifying the longest continuous 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 equally long continuous chains, select the one with most
branches.
4. If the first branch point is the same distance, choose the one that gives
the lowest substituents.
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
3
