3. When should weighing paper be used, as opposed to a weigh boat? A. Weighing paper should be use to weigh out small quantities B. Weighing paper should be use to weigh out liquids C. Weighing paper should be use to weigh out large quantities D. Weighing paper should be use when the sample is not yet at room temperature

2. A 1 L, 100 g (dry weight) sample is removed from a continuous crystallizer which is operated with a residence time of 1000 s. The following particle size distribution is obtained for the sample: i) Size range (um) Mass (g) 200- 300- 400 500 600-700- 800- 300 400 500 600 700 800 900 0- 100- 100 200 2.5 26.0 30.0 21.0 12.0 6.0 2.0 0.5 0.0 Microscopy based on the sieve fractions has found that a volumetric shape correction factor, ky, of 0.52, for the crystal population and the crystal density has been found to be 2000 kg/m³ Determine whether the MSMPR model describes the system. If it does so, then determine the growth and nucleation rates for this system; if it does not, suggest why reasons that may cause deviation of this CSTR type crystallizer from the MSMPR model.

Aluminum is not as strong as steel. What other factor needs to be considered when comparing the desirability of aluminum versus steel if strength is an important consideration for a design?