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Carbon Chemistry and Hydrocarbons
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Carbon Chemistry and Hydrocarbons
Carbon Chemistry and Hydrocarbons
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1
Question
What is valence in chemistry?
Answer
Number of covalent bonds an atom can form.
2
Question
Why does carbon form diverse molecules in life?
Answer
Its four valence bonds allow many combinations.
3
Question
What is the name for molecules consisting only of carbon and hydrogen?
Answer
Hydrocarbons.
4
Question
What type of bond primarily determines carbon’s planarity in certain compounds?
Answer
Covalent bonds (including doubles) influencing geometry.
5
Question
Which elements are most common partners of carbon in biological molecules?
Answer
Hydrogen, oxygen, nitrogen.
6
Question
What is the general formula for alkanes?
Answer
CnH2n+2.
7
Question
What is the general formula for alkenes?
Answer
CnH2n.
8
Question
Which hydrocarbon type contains at least one carbon–carbon double bond?
Answer
Alkenes.
9
Question
What is the structural feature of methane (CH4)?
Answer
A tetrahedral carbon bonded to four H atoms.
10
Question
How many covalent bonds does carbon typically form?
Answer
Four.
11
Question
What is a double covalent bond’s effect on hydrogen count in hydrocarbons?
Answer
Reduces the number of hydrogens relative to alkanes.
12
Question
What is the role of hydrocarbons in fats?
Answer
Hydrophobic tails form fat molecules for energy storage.
13
Question
What distinguishes a planar configuration from a tetrahedral one in carbon bonds?
Answer
Double bonds create planarity; single bonds favor tetrahedral.
14
Question
Why are fats hydrophobic?
Answer
Most bonds are nonpolar C–H, repelling water.
15
Question
What is the term for the study of how carbon skeleton variation leads to diversity?
Answer
Organic molecular diversity (carbon skeleton variation).
16
Question
How can carbon skeletons vary?
Answer
Length, branching, double bond position, rings.
17
Question
What is the structure of ethene (C2H4)?
Answer
CH2=CH2.
18
Question
What about alkanes causes them to be less reactive than alkenes?
Answer
No double bonds; fewer sites for reaction.
19
Question
What shape is typical for carbon in methane due to four single bonds?
Answer
Tetrahedral.
20
Question
What is the relationship between carbon’s valence and its bonding capacity?
Answer
Valence equals number of covalent bonds possible.
21
Question
What does the term ‘structural isomers’ refer to in hydrocarbons?
Answer
Molecules with same formula but different connectivity.
22
Question
How is the Lewis dot structure different from electron distribution diagrams?
Answer
Lewis shows valence electrons; distribution shows all electrons.
23
Question
What determines the stability of a hydrocarbon’s ring structures?
Answer
Ring strain and bonding arrangements.
24
Question
What is the formula for methane’s condensed structural form?
Answer
CH4.
25
Question
What is the condensed structural formula for ethane?
Answer
CH3CH3.
26
Question
Which feature makes alkenes more reactive than alkanes?
Answer
Presence of carbon–carbon double bond.
27
Question
What is meant by ‘carbon skeleton’ in organic chemistry?
Answer
The carbon chain framework of a molecule.
28
Question
What is the relationship between hydrocarbon chain length and branching?
Answer
Affects size, shape, and properties of the molecule.
29
Question
What is cyclohexane an example of?
Answer
A cyclic hydrocarbon (ring structure).
30
Question
What is the typical consequence of a double bond on the hydrogen count?
Answer
Fewer hydrogens than an alkane with same C count.