CdS has a band gap of 2.4 eV. If large crystals of CdS are illuminated with ultraviolet light, they emit light equal to the band gap energy. (b) Would appropriately sized CdS quantum dots be able to emit blue light?
Ch.12 - Solids and Modern Materials

12장, 문제 94
Indicate whether each statement is true or false: (a) Elastomers are rubbery solids. (b) Thermosets cannot be reshaped. (c) Thermoplastic polymers can be recycled.
검증된 단계별 안내1
Understand the definition of elastomers: Elastomers are a type of polymer that exhibit elastic properties, meaning they can stretch and return to their original shape.
Recognize the physical state of elastomers: Elastomers are typically rubbery solids at room temperature due to their flexible polymer chains.
Consider the context of the statement: The statement claims that elastomers are rubbery solids, which aligns with the general characteristics of elastomers.
Evaluate the statement based on the definition and characteristics of elastomers: Since elastomers are indeed rubbery solids, the statement is consistent with the known properties of elastomers.
Conclude the evaluation: Based on the understanding of elastomers as rubbery solids, the statement is true.

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주요 개념
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Elastomers
Elastomers are a class of polymers characterized by their elastic properties, allowing them to stretch and return to their original shape. They are typically composed of long, flexible chains that can undergo significant deformation under stress. Common examples include natural rubber and synthetic materials like silicone and polyurethane.
Rubbery Solids
Rubbery solids refer to materials that exhibit both solid and liquid-like properties, particularly the ability to deform elastically when a force is applied. This means they can stretch and compress without permanent deformation, making them ideal for applications requiring flexibility and resilience, such as in tires and seals.
추천 영상:
가이드 코스
Crystalline Solids Structure
True or False Statements
True or false statements are assertions that can be evaluated for their accuracy based on established facts or definitions. In the context of chemistry, understanding the properties of materials, such as elastomers, is essential for determining the truthfulness of such statements. This evaluation often relies on knowledge of material science and polymer chemistry.
추천 영상:
가이드 코스
Third Law of Thermodynamics Example
관련 실천
교과서 질문
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교과서 질문
CdS has a band gap of 2.4 eV. If large crystals of CdS are illuminated with ultraviolet light, they emit light equal to the band gap energy. (c) What about red light?
243
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교과서 질문
CdS has a band gap of 2.4 eV. If large crystals of CdS are illuminated with ultraviolet light, they emit light equal to the band gap energy. (a) What color is the emitted light?
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교과서 질문
Write the chemical equation that represents the formation of (b) polyacrylonitrile from acrylonitrile (polyacrylonitrile is used in home furnishings, craft yarns, clothing, and many other items).
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교과서 질문
What molecular structural features cause high-density polyethylene to be denser than low-density polyethylene?
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