Ans. Polymers are materials made from reoetitrep of small , simple and chemical unit called monomer.
Ploy means many and mer means repeat unit or simple molecule.
Properties of a polymer are entirely different from those of chemical or monomers from which it is formed.
General characteristic of polymer are followings:
1. Polymers have long chain structures. It may consists of thousands of similar small molecules that are all covalently bonded together.
2. All polymers have one common thing i.e Carbon which further bonds with hydrogen, nitrogen and other organic and inorganic substances.
3. Polymers structure may be crystalline in simple materials but generally they are noncrystalline solids at room temperature.
4. Polymers have light weight and they can be easily fabricated and shaped.
5. Polymers are poor conductor of electricity.
6. Their thermal conductivity is also low and polymers are resistant to chemical attacks.
7. Polymers are more stronger than steel if we compare weight to weight ratio.
8. Polymers are widely used in the different field such as paints, coatings, adhesive etc.. it is also used in aerospace applications.
Indicate the improved characteristics of polymers upon adding the Additives?
Cite five important characteristics for polymers that are to be used in thin-film applications that are used to protect printed wiring boards from environmental influences. a) low flexibility O b) resistance to moisture/chemical attack c) high gas permeability d) high tensile and tear strengths e) low density f) low gas permeability Og) high density o n) high flexibility
Explain the basic characteristics of a Global City and how does these characteristics affect the localities of these cities
Describe basic characteristics of performance appraisals
Q11. 6 points
Please Compare thermoplastic and thermosetting polymers (a) on
the basis of mechanical
characteristics upon heating and (b) according to possible
molecular structures. (c) what
type of polymer material, thermosetting or thermoplastic, you
might select for the
following applications: a surgeon’s glove, a beverage
container, and a pulley.
Q12. 3 points
How do the glass-transition temperatures of polyethylene,
polypropylene, and
polymethyl methacrylate compare? Explain their differences,
based on the structure of
the monomer of each.
Q14. 4 points...
List basic structural characteristics of SARS-CoV-2
Exercise 45 1. Basic characteristics of the bacteria found on human skin. 2. Basic characteristics of Staphylococcus aureus and Propionibacterium. 3. Types of hemolysis. 4. Plates used to test for hemolytic bacteria.
1) Describe the basic characteristics of the monopoly model and explain how these characteristics affect the ability of a monopolist to earn positive economic profits, both in the short run and over time. 2) Compare and contrast the outcomes with respect to price and output in a monopolistically competitive market and a perfectly competitive market. In which situation are consumers better off? Why?
here is a diagram of a chordate. identify and name the four basic
characteristics of this phylum.
Of the following, which are characteristics of basic solutions? (Select all that apply) Select all that apply: pH levels less than 7 at 25°C Greater concentration of hydroxide ions than hydronium ions [H3O+]< [OH-] pH levels of 7 at 25°C