Kuliah MSU

Natural rubber is primarily composed of which polymer?

• Polyethylene

• Polystyrene

• Polyisoprene

• Polyvinyl chloride

Which process is used to improve the properties of natural rubber by cross-linking the polymer chains?

• Polymerization

• Vulcanization

• Cracking

• Distillation

Natural rubber is obtained from which part of the rubber tree (Hevea brasiliensis)?

• Leaves

• Bark

• Roots

• Sap (latex)

What is the main difference between natural rubber and synthetic rubber?

• Natural rubber is a thermoplastic, synthetic rubber is a thermoset

• Natural rubber is derived from plants, synthetic rubber is derived from petroleum products

• Natural rubber is more resistant to heat, synthetic rubber is more elastic

• Natural rubber is only used in the automotive industry, synthetic rubber is used in various industries

Hydrogels are primarily used in wastewater treatment for their ability to

• Provide thermal insulation

• Absorb and retain large amounts of water

• Conduct electricity

• Enhance mechanical strength

Hydrogels can be modified to target specific contaminants in wastewater. Which property of hydrogels is typically modified for this purpose?

• Mechanical strength

• Electrical conductivity

• Chemical functionality

• Thermal stability

What role do hydrogels play in the removal of organic pollutants from wastewater?

• They facilitate thermal degradation of pollutants

• They act as catalysts for chemical reactions

• They adsorb and encapsulate organic pollutants

• They increase the acidity of the wastewater

One of the primary advantages of activated carbon in water treatment is its

• High thermal conductivity

• High surface area

• High electrical conductivity

• High density

Why necessary to coagulate rubber?

• easy processing

• easy transportation

• enhances quality and consistency

• to remove water

Which of the following techniques is commonly used for the forensic analysis of rubber?

• • Gas Chromatography (GC)

• • Scanning Electron Microscopy (SEM)

• • Infrared Spectroscopy (IR)

• • X-ray Diffraction (XRD)