Georgia Science Grade 8

Chapter 9: Carbon Chemistry

CRCT Practice

1
What is the general formula for this family?

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A)C2n Hn
B)CnH2n+2
C)CnH2n
D)CnH2n–2
2
What is the formula of octene?

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A)C6H12
B)C8H16
C)C6H10
D)C8H18
3
Based on its root name and suffix, what is the structural formula of propyne?
A)H–C≡C–CH3
B)CH3 – CH2 – CH3
C)H2C=CHCH3
D)HC≡CH
4
Which is saturated and has the fewest number of carbon atoms?

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A)A
B)B
C)C
D)D
5
These are all considered to be carboxylic acids because they contain which of the following?

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A)a –COOH group
B)a –CH3 group
C)a double bond
D)C, H, and O atoms
6
As five amino acids polymerize to form a protein, how many water molecules split off?
A)5
B)4
C)none
D)C
7
As an –NH2 group replaces a hydrogen in a hydrocarbon, which type of compound is formed?
A)amino acid
B)alcohol
C)amine
D)D
8
A carbon atom has a mass of 12 units. Hydrogen has a mass of 1 unit. A molecule of methane has a molecular mass of (12 × 1 atom) + (1 × 4 atoms) = 16 units. What is molecular mass of C2H6?

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A)144 units
B)21 units
C)24 units
D)30 units
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