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1. Explain in detail how glass transition temperature and molecular mobility relate to the following:
Stable drying process
Stable freezing process
Stable freeze drying process
2. Nonfat dried milk is produced by spray-drying skim milk. During dehydration, the water activity (Aw) was monitored as mositure was removed. The graph shown below contains isotherms for dehydration of teh skimmilk, rehydration of teh nonfat dry milk as well as an isotherm for another food (confectionary product) containing large levels of sugar.a.) Identify the isotherm that you would expect to obtain during skim milk dehydration. Provide reason for your answer (use the graph below)b.) Divide the isotherm you have chosen (in a) into regions based on the type of water removed from skimmilk while undergoing dehydration to produce nonfat dry milk. Identify the various types of water repsented in each region.c.) The isotherms shown above were obtained at 25C. Show (Graphically) the effect that determining water activity at 40C would have on the desorption isotherm obtained for the production of nonfat dry milk. Provide reason for your answer.
** x axis = water activity
The air is cooled as the water evaporates. How much water must be evaporated to cool the air in a room of dimensions 4.0 m x 5.0 m x 3.0 m by 20. C? Assume that the enthalpy of vaporization of water is the same as it is at 25 c.
The evaporation of water H2O(l) ->H2O(g) is endothermic: Change in T degree +44.01 kJ Determine the minimum mass of water (in ) has to evaporate to absorb 183 joules of heat?
Problem- In a solution of 108.5 mM acetate buffer (again, this is the concentration of all ionization states of the acetate/acetic acid combined), what is the pH of the solution if the concentration of acetate is 94.9 mM
If 6 grams of benzoic acid were dissolved in 600mL of water, explain how much benzoic acid would be extracted with four150-mL portions of dichloromethane
A piece of iron weighing 85.690 g was burned in air. the mass of the iron oxide produced was 118.350 g. What are the moles of iron in the original sample
A patient is given 0.055mg of technetium -99m, a radioactive isotope with a half-life of about 6.0 hours.
What is the ph at the equivalence point for the titration of .20M nitrous acid by .20M sodium hydroxide
Determine how long will it take for a sample of N2O5 to decay to sixty percent of its initial value?
Question- An unknown compound contains only C, H, and O. Combustion of 8.20 g of this compound produced 16.4 g of CO2 and 6.71 g of H2O. What is the empirical formula of the unknown compound
Based on the following equation, determine the mass of a 50.0mL sample of your salt solution. Report the mass as a number and use all lower case letters to spell out the word(s) in the unit(s).
Determine the molar ratio of hydrogen to carbon in the fuel (r), where r=y/x, and the percentage excess air used in the combustion.
Determine the binding energy of an O-16 nucleus. The O-16 nucleus has a mass of 15.9905 amu, A proton has a mass of 1.00728 amu, a neutron has a mass of 1.008665amu, and 1amu is equivalent to 931 MeV of energy.
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