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Q: The standard enthalpy of vaporization (H°vap) of ethylenediamine ((NH2CH2)2) is 44.0 kJ/mol. The…
A: Given: Heat of vaporization of ethylenediamine = 44.0 KJ/mol = 44000 J/mol…
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A: Conversion of temperature from ˚C to K: Conversion of atm to Pa: Conversion of m3 to cm3:
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A: D) Temp
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Q: The normal boiling point of benzene is 80.10 °C. At 25.00 °C, the vapour pressure of benzene is…
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Q: The normal boiling point of cyclohexane is 80.74 °C. At 20.00 °C, the vapour pressure of cyclohexane…
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- Show the universal recycling codes to the learners. Or hang a poster of the codes in the classroom for the learners to examine. Ask the learners to bring a plastic product with any of the recycling code listed below. Ask them to describe the material: 1. What is the sample polymer material used for? 2. What recycling code is printed on the sample? 3. Describe the material in terms of hardness and/or flexibility. 4. Why are recycling codes used in the plastic materials?what is the diffrence between fibres and elastomers?c) List down one processing method for production of composite tubes made of fiber reinforced polymer.Briefly describe the processing steps involved.
- 1. (a)Differentiate polypropylene and Polyurethane in term of(i)molecular structure(ii)behaviour upon heating(iii)classifification or type of polymer(iv)based on their structure, draw the stress-strain curve of both polymer.(b) Composites can be used in many applications such as sport equipment, automotive industry and Oil and gas industry.(i)Suggest one composites materials and parts/component used in these applications.(ii)Why the composite material is used for those parts as stated your answered above36- At Powder Pressing of ceramic, the function of binder is ….. * a- decreasing of porosities. b- lubrication of particles. 37- Ceramic substrates that are used for integrated circuits and layered capacitors are manufactured by ……. * b- tape casting. a- rolling. 38- Material which has no fixed solidification temperature, is considered as…. * a- crystalline. b- glass. 39- Refractories that are rich in magnesia (MgO) are termed…… * a- Acidic. b- Basic. 40- The function of Feldspar is …… * a- filler. b- flux. c- plastic material.POLYMER CHEMISTRY - 1. Briefly describe what is thermoplastic, thermoset plastic and elastomer. Give examples to clarify your answers. 2. Briefly discuss the effect of thermodynamic on polymerization. 3. What are important factors influencing the properties of polymers?
- Which of the following is not an optical property of solid materials? Single choice. a. Polarization b. Transmittance c. Response to magnetic field d. Absorption e. All of the above are optical properties of solid materialsCan embedding nanoparticles of silver intoa polymer give the polymer antimicrobialproperties?The addition of dimethylglyoxime, H2C4H602N2, to a solution containing nickel(Il) ion gives rise to a precipitate: Nickel dimethylglyoxime is a bulky precipitate that is inconvenient to manipulate in amounts greater than 135 mg. The amount of nickel in a type of permanent-magnet alloy ranges between 22% and 38%. Calculate the sample size that should not be exceeded when analyzing these alloys for nickel.
- Glass transition temperature is important for fabrication of polymers. Justify this statement. Draw the graph show the relationship of degree of polymerization with Tensile strength. Explain which one is having high Tg and Why?A. Polystyrene and Polyethene B. Nylon 66 and PolypropenePolymeric composite materials can be obtained by adding fillers in the form of particles or fibers in a polymeric matrix and are intended to form a new material with properties different from those of pure components. Regarding polymeric composites, review the statements below and check which is true and which is false. (I) The mechanical properties of a fiber reinforced polymer composite are not influenced by fiber length. (II) Composites with unidirectional continuous fibers have isotropic mechanical properties. (III) The interfacial adhesion between matrix and dispersed phase does not influence the magnitude of the final mechanical properties of the composite. (IV) In polymeric composites, fibers are normally less ductile than polymeric matrices. (V) The specific area of a material at the nanoscale is significantly less than the specific area of the same material at the microscale.Determine whether the first part of statement will INCREASE, DECREASE or HAVE NO EFFECT in the second part of the statement. 1.If there is an increase in amount of plasticizer in polycarbonate then the stiffness will _____. 2. If we substitute the Fe3+ (64 pm) in hematite ((-Fe2O3) by Zn2+ (73 pm), then the Interplanar distance will _______. 3. If there is an increase in plar groups then the degree of polymerization will ________.