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CHEM 219: MODULE 2 EXAM QUESTIONS AND ANSWERS 2024
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CHEM 219: MODULE 2 EXAM QUESTIONS AND ANSWERS 2024
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CHEM 219: MODULE 2 EXAMWhat is distillation? - ANSWERS-separates liquids with different boiling points
What is an addition reaction? - ANSWERS-It adds atoms or groups of atoms to
each carbon of the multiple bonds.
How is bromine used for finding alkenes? - ANSWERS-The orange brown that
normally appears when bromine is added to compounds is dispersed when added
to alkanes.Canbe. ualitative
What happens when you add water to an alkene? H + OH - ANSWERS-It converts
an alkene into an alcohol
What happens if you add acid to alkenes? - ANSWERS-The H is attached to a
carbon and the A is attached to the other.
What it is H-A supposed to mean in the addition of acids? - ANSWERS-H is the acid
A is the rest H-A
With alkenes:
H-OH
H-Br
Br
,H2
What kind of reactions are these? - ANSWERS-Hydration
Addition of an acid
Halogenation
Hydrogenation
Hydration reactions of alkenes will look like? - ANSWERS-The product is an alcohol
creates -anol at the end
H-OH
Halogenation reactions look like: - ANSWERS-Adding chlorine and bromine easily
Hydrogenation reactions look like: - ANSWERS-Referred to as a reduction and
produces cis isomers.
What happens if you add hydrogen to alkenes? - ANSWERS-It converts to an
alkane. Because it become saturated. Also known as a reduction.
It requires a coinage metal as a catalyst
Hydrogenation produces what kind of stereoisomer? - ANSWERS-Cis isomers in
molecules that exhibit stereochemistry in the final product.
, What are oxidation reactions of alkenes? - ANSWERS-Due to the high electron
density in double bonds. Alkenes readily react with oxidizing reagents.
They transfer oxygen. Attacks the pi-electrons.
Can be used as a qualitative test.
When alkenes react with potassium permanganate what happens? - ANSWERS-
They turn into a diol
KMnO4
What is an ozonolysis reaction with alkenes? - ANSWERS-Alkenes react with
Ozone, O3, who is an allotrope of oxygen. It cleavages the double bond, it creates
a C=O or two carbonyl compounds.
Can be used in a qualitative manner to determine where a chain in a double bond
is present.
What are hydrocarbons? - ANSWERS-Molecules composed of only the elements
carbon and hydrogen
What are the two major classes of hydrocarbons? - ANSWERS-Aromatic (benzene)
and aliphatic (alkanes, alkenes, alkynes)
What is the main source of hydrocarbons? - ANSWERS-Fossil fuels like coal,
petroleum, and natural gas obtained by mining and drilling.
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