1. What are microwave cook wares made of? 2. List 15 different things made of plastics in your house. Group them as thermoplastics and thermosetting plastics? 3. Production of synthetic fibres helps in the conservation of forests. Comment. 4. The material A is a fossil fuel which is extracted from the earth. It is said to be formed from the buried large land plants by a very slow process B. When A is heated in the absence of air in a process C, then it gives three products D, E and F. The product D is used as a reducing agent in the extraction of metals, the product E is used as an industrial fuel whereas the product F has been traditionally used for metalling the roads. a. What could material A be? b. What is (i) physical state, and (ii) colour of A? c. Name the processes (i) B, and (ii) C d. What are (i) D, (ii) E, and (iii) F? 5. In petroleum well, crude oil is found above water. Which two properties of petroleum make it possible to form a layer of it above water? 6. State some harmful effects of using fossil fuels? 7. When a lot of dry powder of a substance X is released over a fire, the fire gets extinguished. a. Name the substance X. b. How does this substance extinguish the fire? c. Name another substance which behaves like X. 8. Write a short note on the causes and effects of global warming and acid rain. 9. Draw and label a candle flame with different zones and explain about the zones. 10. Find out the reasons why hydrogen is not used as a fuel although it has very high calorific value. Plz write the answers for all of this
Answers
Explanation:
1. Microwave oven cookware is generally made from glass, ceramic or special plastics; however not all glass, ceramic and plastic containers are microwave safe. Safe microwave cookware typically includes heat-resistant glassware, chinaware, firm plastics and polythene like Tupperware.
2. Thermoplastics have been around for a long time and are an important component of everyday life today. For example:
Acrylonitrile butadiene styrene (ABS) is a thermoplastic used to manufacture:
Sports equipment.
Toys (for example LEGO® blocks).
Various automobile parts
Polycarbonate is used to make:
CDs and DVDs.
Drinking bottles
Food storage containers
Eyeglass lenses.
Polyethylene is probably the most common thermoplastic and is used to make:
Shampoo bottles.
Plastic grocery bags.
Bullet-proof vests.
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