Question

1. Certain plastic items are called unbreakable. What is this material
2. Certain plastics can be recycled. What type of plastics are these
recycled. What type of plastics are these ? Give two examples of such material.
3. Burning cotton or cotton clothes smells like burning paper, whereas bu
Give reasons.
s smells like burning paper, whereas burning wool smells like burning hair.
4. Which properties of melamine form the basis of its use as coating on fire-resistant uniforms
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Answer 1

Answer:

1) The unbreakable plastics are made from polyvinyl chloride(PVC), polyethylene (PE) and polypropylene (PP).

2) The recyclable plastics are Polyethylene Terephthalate (PETE or PET) ,High-Density Polyethylene (HDPE) ,Polyvinyl Chloride (PVC) ,Low-Density Polyethylene (LDPE) ,Polypropylene (PP)  and Polystyrene or Styrofoam (PS).

3) Burning cotton or cotton clothes smells like a burning paper, whereas burning wool smells like a burning hair. ... Cotton is a plant product and paper is also made from plants. So when cotton is burnt, it smells like burning paper. While wool and hair both are from animals, hence on burning they smell similar.

4) Melamine is highly stable and can resist high temperature exposure as well as physical and chemical degradation. Melamine is also a flame retardant and also possesses properties like hardness, scratch and moisture resistance.

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