Podcast
Questions and Answers
Which of the following is a characteristic of thermoplastics?
Which of the following is a characteristic of thermoplastics?
Thermosetting plastics can be softened again by heating after they are molded.
Thermosetting plastics can be softened again by heating after they are molded.
False
Who discovered plastics and in what year?
Who discovered plastics and in what year?
Christian Schonbein in 1846
The primary ingredient of plastic is an organic substance of large ______ weight.
The primary ingredient of plastic is an organic substance of large ______ weight.
Signup and view all the answers
Match the following types of plastics with their descriptions:
Match the following types of plastics with their descriptions:
Signup and view all the answers
Which of the following is NOT an example of a thermoplastic?
Which of the following is NOT an example of a thermoplastic?
Signup and view all the answers
Recycling of plastic is essential to prevent pollution.
Recycling of plastic is essential to prevent pollution.
Signup and view all the answers
What does the term 'plastic' mean in Greek?
What does the term 'plastic' mean in Greek?
Signup and view all the answers
What is the melting point of polypropylene (PP)?
What is the melting point of polypropylene (PP)?
Signup and view all the answers
Low-density polyethylene (LDPE) has a higher tensile strength than high-density polyethylene (HDPE).
Low-density polyethylene (LDPE) has a higher tensile strength than high-density polyethylene (HDPE).
Signup and view all the answers
What types of food containers are commonly made from polypropylene (PP)?
What types of food containers are commonly made from polypropylene (PP)?
Signup and view all the answers
LDPE can withstand temperatures of up to _____ °C continuously.
LDPE can withstand temperatures of up to _____ °C continuously.
Signup and view all the answers
Match the following plastics with their primary characteristics:
Match the following plastics with their primary characteristics:
Signup and view all the answers
What is one of the main uses of PET plastic?
What is one of the main uses of PET plastic?
Signup and view all the answers
PET plastic is free from any hazardous substances.
PET plastic is free from any hazardous substances.
Signup and view all the answers
What harmful substance can be released from PET containers when left in warm temperatures?
What harmful substance can be released from PET containers when left in warm temperatures?
Signup and view all the answers
Polyvinyl Chloride (PVC) is known to leach toxic chemicals such as __________.
Polyvinyl Chloride (PVC) is known to leach toxic chemicals such as __________.
Signup and view all the answers
Which plastic is considered the most hazardous in terms of toxicity?
Which plastic is considered the most hazardous in terms of toxicity?
Signup and view all the answers
HDPE is made from petroleum and has higher tensile strength than LDPE.
HDPE is made from petroleum and has higher tensile strength than LDPE.
Signup and view all the answers
What types of items are typically made from Polyvinyl Chloride (PVC)?
What types of items are typically made from Polyvinyl Chloride (PVC)?
Signup and view all the answers
High-Density Polyethylene (HDPE) can cause __________ symptoms in children.
High-Density Polyethylene (HDPE) can cause __________ symptoms in children.
Signup and view all the answers
Which of the following chemicals can leach from PVC?
Which of the following chemicals can leach from PVC?
Signup and view all the answers
Match the following types of plastic with their respective characteristics:
Match the following types of plastic with their respective characteristics:
Signup and view all the answers
What happens to the cloth after mopping the acid solution and placing it on the stove?
What happens to the cloth after mopping the acid solution and placing it on the stove?
Signup and view all the answers
Biopolymers or biodegradable polymers can be used safely to avoid environmental hazards.
Biopolymers or biodegradable polymers can be used safely to avoid environmental hazards.
Signup and view all the answers
List two properties of plastic.
List two properties of plastic.
Signup and view all the answers
Plastics are classified into two types: ______________ and thermosetting.
Plastics are classified into two types: ______________ and thermosetting.
Signup and view all the answers
Match the following types of plastics with their characteristics:
Match the following types of plastics with their characteristics:
Signup and view all the answers
Which of the following plastics can withstand higher temperatures continuously?
Which of the following plastics can withstand higher temperatures continuously?
Signup and view all the answers
Plastics are good conductors of heat and electricity.
Plastics are good conductors of heat and electricity.
Signup and view all the answers
What is a potential risk associated with Polyethylene Terephthalate (PET)?
What is a potential risk associated with Polyethylene Terephthalate (PET)?
Signup and view all the answers
The seven types of plastics mentioned in the content include PET, HDPE, PVC, LDPE, ___________________, and others.
The seven types of plastics mentioned in the content include PET, HDPE, PVC, LDPE, ___________________, and others.
Signup and view all the answers
Which property of plastics makes them easily moldable?
Which property of plastics makes them easily moldable?
Signup and view all the answers
Study Notes
Plastics
- Plastics are derived from the Greek word "plastikos," meaning "to mold."
- Plastics are materials containing organic substances with high molecular weights, typically polymers with long carbon chains.
- Plastics were discovered accidentally by Christian Schönbein in 1846.
Types of Plastics
- Thermoplastics: These can be easily deformed and bent upon heating, often through linear or a combination of linear and cross-linked polymers. Examples include PVC, nylon, and polythene.
- Thermosetting plastics: These cannot be softened upon heating once molded. They involve heavily cross-linked polymers. Examples include bakelite and melamine.
Recycling of Plastics
- Recycling plastics is important to prevent pollution.
- They are usually non-biodegradable materials, not easily decomposed by microorganisms
- Recycling can be more difficult if mixed with other materials.
Properties of Plastics
- Strong and ductile
- Poor conductors of heat and electricity
- Easily molded into different shapes and sizes
- Resistant to corrosion and many chemicals
Seven Types of Plastics
- Polyethylene Terephthalate (PET or PETE): Primarily used for food and drink packaging due to its ability to prevent oxygen from entering and spoiling, and helping keep carbonation, although it may contain antimony trioxide which is a carcinogen.
- High-Density Polyethylene (HDPE): A relatively more stable plastic used for food and drink containers, harder and more opaque to withstand higher temperatures. Potential leaching of estrogen mimicking chemicals that may disrupt human hormone balance.
- Polyvinyl Chloride (PVC): This type of plastic is considered highly hazardous, and can leach many harmful chemicals such as bisphenol A (BPA), phthalates, lead, dioxins, mercury, and cadmium.
- Low-Density Polyethylene (LDPE): A more flexible and tougher plastic than HDPE, used for storage containers, wraps, bags and coatings, but challenging to recycle.
- Polypropylene (PP): Commonly used for packaging, and as it's more resilient to hot temperatures, often for food containers.
- Polystyrene (PS): Often used in disposable products like packaging and containers such as styrofoam. Can leach styrene, which is considered a brain and nerve toxin, upon exposure to hot or oily foods.
- Other Plastics: This category encompasses various plastics that don't fit into the other six categories and include a wide range of applications
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
This quiz covers the essential concepts of plastics, including their origins, types, properties, and recycling. Explore the differences between thermoplastics and thermosetting plastics, and understand the significance of recycling in combating pollution. Participate to test your knowledge on this ubiquitous material!
