Please answer these questions
1.What is meant by monomers?
2. Name two synthetic fibres that have high tensile strength.
3. Give a brief account of the use of plastics in hospitals.
4. Classify the following fibres as natural and synthetic fibres
Nylon, acrylic, cotton, rayon, wool, silk
5. Differentiate between rayon and nylon.
6. Which among comb and a Bakelite handle will not change its shape on heating?
7. Briefly describe the characteristics of acrylic.
8. In what ways do plastics pollute the environment? What measures can be adopted to
overcome this problem?
Answers
Explanation:
1 . Monomer, a molecule of any of a class of compounds, mostly organic, that can react with other molecules to form very large molecules, or polymers. The essential feature of a monomer is polyfunctionality, the capacity to form chemical bonds to at least two other monomer molecules.
2 .High tensile strength
Elastic nature
Do not wrinkle
3. Plastics can be used in healthcare in the following ways:
Plastics are used in the packaging of tablets, syringes, doctor's gloves and a number of medical instruments. ... Threads used for stitching wounds are made of medical instruments. 3. Plastics are used for making intravenous blood bags and heart valves as well.
4. nylon, wool, cotton, silk, polyester, jute. Answer: The fibres which are obtained from plants and animals are called natural fibres but those which are not obtained from these sources are called synthetic fibres. Natural fibres Wool, cottton, silk, jute.
5. Rayon is a natural fibre or semi-synthetic fibre, they are woven in nature whereas Nylon is not natural, it is synthesized on a large scale. (2) The rayon material is very hard compared to nylon. (3) Rayon can resist the hard tear whereas nylon will be damaged on destruction or hard tear.
6. Here is your answer. Thermoplastics are not used to make saucepan handles because these plastics can melt when exposed to enough heat. So, these handles are made of themosetting plastics which do not melt easily.
7. Acrylic is a transparent plastic material with outstanding strength, stiffness, and optical clarity. ... Acrylic sheet exhibits glass-like qualities—clarity, brilliance, and transparency—but at half the weight and many times the impact resistance of glass.
8. 10 Ways to Reduce Plastic Pollution
Wean yourself off disposable plastics. ...
Stop buying water. ...
Boycott microbeads. ...
Cook more. ...
Purchase items secondhand. ...
Recycle (duh). ...
Support a bag tax or ban. ...
Buy in bulk.
Answer:
Ans 1. Monomer, a molecule of any of a class of compounds, mostly organic, that can react with other molecules to form very large molecules, or polymers. The essential feature of a monomer is polyfunctionality, the capacity to form chemical bonds to at least two other monomer molecules.
Ans 2. Nylon has high tensile strength
Ans 3. Plastics have been used widely to create medical tools and devices like surgical gloves, syringes, insulin pens, IV tubes, catheters, inflatable splits, etc. Such products are created for one-time use and help prevent the spread of dangerous diseases by eliminating the need to sterilize and re-use a device.09-Oct-2017
Ans. 4 Natural fibres | Synthetic fibres
wool, cotton, jute, silk. | nylon, polyester
Ans 5. (1) Rayon is a natural fibre or semi-synthetic fibre, they are woven in nature whereas Nylon is not natural, it is synthesized on a large scale. (2) The rayon material is very hard compared to nylon. (3) Rayon can resist the hard tear whereas nylon will be damaged on destruction or hard tear.
Ans. 6 Thermoplastics are not used to make saucepan handles because these plastics can melt when exposed to enough heat. So, these handles are made of themosetting plastics which do not melt easily.
Ans. 7 Acrylic is a transparent plastic material with outstanding strength, stiffness, and optical clarity. ... Acrylic sheet exhibits glass-like qualities—clarity, brilliance, and transparency—but at half the weight and many times the impact resistance of glass.
Ans. 8 Wean yourself off disposable plastics. ...
Stop buying water. ...
Boycott microbeads. ...
Cook more. ...
Purchase items secondhand. ...
Recycle (duh). ...
Support a bag tax or ban. ...
Buy in bulk.