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Scientists often use models to illustrate abstract concepts or to help in evaluating a theory. Describe the three types of models (layer sequence drawings, computer graphics, balls and sticks) used for visualizing the three dimensional structure of unit cells. Then explain how each type helped you to learn about the structures in different ways.
student performed two melting-point determination on a crystalline compound. in one determination the capillary tube contained a sample about 1-2 mm in hight and the melting range was found to be 141-142C
Blending of two wines with different concentrations of acid, Two wines are available for blending: One tank of 1000 L has a Titratable Acidity of 9.0 g/L and another tank containing 2000 L has a Titratable Acidity of 0.6 g/L.
Two liters of a buffered solution are created from .55 M HC3H5O3 (Ka= 1.3 E-4) and .45 M NaC3H5O3. what is the pH of the solution?
How many moles of CF4 can be produced when 5.00 mol C react with 8.00 mol F2?
Calculate the number of [CH2CHOH] monomer units in the average strand of PVA (78,000 g/mol).
Cyanogen is a gas which contains 46.2 % C and 53.8 % N by mass. At a temperature of 25oC and a pressure of 750 mmHg, 1.50 g of cyanogen occupies 0.714 L.
How many moles of BCl3 are needed to produce 25.0 g of HCl(aq) in the following reaction?
how many calories are used to heat a 50g sample of water from 8.1 degrees celius to 27.4 degrees celcius?
What liquid is insoluble in water and soluble in cyclohexane and alcohol; and has a boiling pint of 58 degress Celsius at 670 mm Hg.
does it mean that the solution will shift towards the products because there is excess of reactants? what does it mean when the solution is orange (is it shifting towards products or reactant)?
Rb has two naturally occurring isotopes 85Rb and 87Rb, with masses 84.9118 amu and 86.9092 amu, respectively. The average atomic mass is 85.468 amu.
You have pure beta-D-glucopyranose of 100 grams nearly, it was dissolved in an ethanol/water combination with the intention to recrystallize the sugar. You get pure beta-D-glucopyranose crystals 60 grams back why this 40% loss was to happen.
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