Polime và Vật liệu polime Practice Questions
THPT (Vietnam) · THPT Hóa học · 151 free MCQs with instant results and detailed explanations.
151
Total
44
Easy
78
Medium
29
Hard
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Sample Questions from Polime và Vật liệu polime
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Q1
Easy
Which of the following is a common property of thermoplastic polymers?
A.
They can be reshaped upon heating.
B.
They have a permanent set after cooling.
C.
They can only be used once.
D.
They are typically brittle and inflexible.
Show Answer & Explanation
Correct Answer: A
Thermoplastic polymers can be heated and reshaped multiple times without altering their chemical structure, making option A correct.
Q2
Easy
What is the monomer unit of polyethylene?
A.
Ethylene
B.
Propylene
C.
Butylene
D.
Styrene
Show Answer & Explanation
Correct Answer: A
Polyethylene is made from the polymerization of ethylene monomers, making option A the correct choice.
Q3
Easy
Which of the following applications is NOT suitable for thermosetting polymers?
A.
Electrical insulators
B.
Adhesives
C.
Flexible tubing
D.
Heat-resistant coatings
Show Answer & Explanation
Correct Answer: C
Thermosetting polymers are rigid and cannot be reshaped after curing, making them unsuitable for flexible applications like tubing, thus option C is correct.
Q4
Medium
Which of the following is a characteristic property of polymers?
A.
High melting point
B.
Low density
C.
Insoluble in water
D.
Good electrical conductivity
Show Answer & Explanation
Correct Answer: B
Polymers typically have low density due to their long chain molecular structure, which results in less mass per unit volume. This property makes them lightweight compared to metals or ceramics.
Q5
Medium
What is the main process through which addition polymers are formed?
A.
Condensation reaction
B.
Addition reaction
C.
Sublimation
D.
Depolymerization
Show Answer & Explanation
Correct Answer: B
Addition polymers are formed through an addition reaction where monomers with double bonds react to form long chains without the loss of any small molecules, unlike condensation polymers.
Q6
Medium
When heated, which of the following types of polymers can be reshaped multiple times?
A.
Thermosetting polymers
B.
Elastomers
C.
Thermoplastic polymers
D.
Biodegradable polymers
Show Answer & Explanation
Correct Answer: C
Thermoplastic polymers can be reheated and reshaped multiple times because they do not form cross-links between chains, allowing them to soften upon heating.
Q7
Medium
What type of bond primarily holds the polymer chains together in a thermosetting polymer?
A.
Ionic bonds
B.
Hydrogen bonds
C.
Covalent bonds
D.
Van der Waals forces
Show Answer & Explanation
Correct Answer: C
Thermosetting polymers are characterized by strong covalent bonds that form cross-links between the polymer chains, providing rigidity and preventing them from melting upon heating.
Q8
Hard
Which of the following is a characteristic property of thermosetting polymers?
A.
They can be reshaped upon heating.
B.
They maintain their shape upon cooling.
C.
They are soluble in organic solvents.
D.
They exhibit high elasticity.
Show Answer & Explanation
Correct Answer: B
Thermosetting polymers, once set, cannot be reshaped or remolded upon heating. They maintain their shape and strength upon cooling due to cross-linking of polymer chains.
Q9
Hard
Which of the following polymers is most likely to be biodegradable under natural conditions?
A.
Polyethylene
B.
Polylactic acid (PLA)
C.
Polystyrene
D.
Polyvinyl chloride (PVC)
Show Answer & Explanation
Correct Answer: B
Polylactic acid (PLA) is derived from renewable resources and is specifically designed to be biodegradable, breaking down into natural substances over time. In contrast, Polyethylene, Polystyrene, and PVC are not biodegradable, persisting in the environment for long periods.
Q10
Hard
A polymer is synthesized through the condensation reaction of hexanediol and adipic acid. What type of polymer is formed?
A.
Addition polymer
B.
Condensation polymer
C.
Cross-linked polymer
D.
Elastomer
Show Answer & Explanation
Correct Answer: B
The reaction between hexanediol and adipic acid involves the elimination of a small molecule (water) during polymerization, classifying it as a condensation polymer. Addition polymers do not involve such elimination.
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Polime và Vật liệu polime — THPT (Vietnam) THPT Hóa học Practice Questions Online
This page contains 151 practice MCQs for the chapter Polime và Vật liệu polime in THPT (Vietnam) THPT Hóa học. The questions are organized by difficulty — 44 easy, 78 medium, 29 hard — so you can choose the right level for your preparation.
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