Carbon nanotubes can be produced by ..method * chemical vapor deposition Sol-Gel physical vapor deposition chemical precipitation The surfactants which used in the emulsion method have the ability to create an intermediate surface between water and oil. * TRUE FALSE Phytochelatin synthase is one of the stress-relieving enzymes in yeasts.
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- Polyurethane is a very common polymer that being used in various application from rigid interior product up to flexible foam product. Illustrate the reaction in the formation of polyurethane foams, state the function of each reactant and briefly explain 2 main applications of polyurethane foam in industries. How can you design or formulate flexible polyurethane foam that can be used as cleaning sponge?What is a fluid? Discuss some examples of fluids and give an example eachDraw a graph (not to scale) depicting the relationship between shear stress and shear rate of the fluids discussed aboveDescribe what happens to blood at both low and high shear rates.What is the law that differentiates Newtonian fluids from Non-Newtonian fluids?Polyethylene glycol 400 (PEG400) is a nonvolatile liquid polymer, which when mixed with water canbe used as a base for parenteral formulations. The designation “400” means that the molecular weightof PEG molecules is approximately 400 g/mol. Preparation with water (ΔHv = 40.7 kJ/mol) requires that the two be mixed at 56 oC, at which the equilibrium vapor pressure of pure water is 16.5 kPa. a. If 105 g of PEG400 are added to 500 g of water at 56 oC, what will the boiling temperature of the solution be?
- In which option is the order showing whether the questions given below are true or false? ( ) Airborne humectants are generally called hygroscopic substances. ( ) Removing water from solids can be done by heating your sample in the oven just below its melting point. ( ) Drying capacity is a measure of the drying efficiency of the dryer. ( ) Drying intensity is the amount of water held by 100 grams of dryer. ( ) For the phenomenon called "blooming" to occur, the vapor pressure of the hydrate system must be higher than the partial pressure of water in the air. A. Right, Wrong, Right, Wrong, RightB.Right, Right, Wrong, Wrong, RightC.Right, Wrong, Wrong, Wrong, RightD. Right, Wrong, Wrong, Right, RightE.Right, Right, Wrong, Wrong, Rightwhy spontainiety occur??synthetic ion exchange resins. These resins are organic polymeric networks that contain functional groups that are permanently attached to the resin. One such functional group is sulfonic acid, -SO3H. When placed in water, the resin (being a large organic molecule) will not dissolve. However, the ionic functional groups become hydrated and the resin will swell as it takes up waters of hydration. The resin may then be thought of as a solid solution mixture with the functional groups being "dissolved" but the polymer remaining as a solid. The hydronium ion (H3O+) associated with acidic functional groups like sulfonic acid will dissociate just as it would if the acid were free of the resin. If other cations such as Cu2+ or Na+ are added to the resin, an ion-exchange reaction can occur: . Note that one H+ is released for each positive charge bound to the resin. Since the resin exchanges a hydrogen ion for a sodium ion in this reaction, sulfonic acid resins are called cation-exchange…
- This is the most common industrial process for preparing large-scale production of nanoparticles wherein a liquid or gas is fed into a furnace and the nanoparticles are recovered by air classification. a. sol-gel method b. sputtering c. pyrolysis d. laser ablationWhat is the chemical formula of the solid represented by the verticalphase boundary passing through point g? (Hint: use mole fractions of A and B to answer this)Which of the following statement/s is/are TRUE? The Arrhenius Theory cannot be applied to account for the behavior of the molar conductivity of strong electrolytes, since these solutes are completely dissociated, at least in dilute solutions. Debye=Huckel Theory of interionic attraction satisfactorily explains the variation of the molecular conductivity of strong electrolytes with concentration. The ions interact with the solvent molecules through dipole-dipole interaction. When an electric potential is applied across the solution, the ions migrate and the ionic atmosphere around these ions is modified. I, II, IV I, III II, III, IV I, II I, II, III
- Which of the following statement/s is/are TRUE? The Arrhenius Theory cannot be applied to account for the behavior of the molar conductivity of strong electrolytes, since these solutes are completely dissociated, at least in dilute solutions. Debye=Huckel Theory of interionic attraction satisfactorily explains the variation of the molecular conductivity of strong electrolytes with concentration. The ions interact with the solvent molecules through dipole-dipole interaction. When an electric potential is applied across the solution, the ions migrate and the ionic atmosphere around these ions is modified.What is the amount of energy required (in KJ) to convert 100g of ice at -20 degrees to steam vapour at 120 degrees? If the total amount of surfactant to be used in an emulsion is 5g, calculate the amount of Span 80 (HLB=4.3) and Tween (HLB =16.7) in order to obtain an HLB value of 9.5a. Colloidal particles typically have a negative surface charge that attracts oppositely charged positive ions in the surrounding bulk solution. These so-called _______-ions are held at the particle surface through electrostatic and van der Waals forces of attraction strongly enough to overcome thermal agitation. b. Turbine and propeller type mechanical mixers used for rapid mixing of reagent chemicals have either ------------- flow impellers with flat or curved blades located parallel to the axis of the drive shaft, or --------------------- flow impellers with blades making an angle of less than 90o with the drive shaf
