Homework Unit 57 Section 7 1. What friction rate should be used to size a duct for a static pressure drop of 0.1 in wc if the duct has a total equivalent length of 150 ft? (57.10) 2. What size metal duct should be used to deliver 170 CFM with a pressure drop of 0.15 in wc if the total equivalent length of 130 ft? (57.10) 7 in.
Pb (NO3) 2 10. A compound is 42.3 % C, 5.94 % H, 32.9 % N, and 18.8 % O and has a molecular mass of 425.25 g/mol. Calculate the empirical and molecular formula. C15H25N10O5 11. How many moles of Al2O3 are produced by the reaction 200. g Al?
Calculate the mass of the liquid for each trial. (Subtract the mass of the empty graduated cylinder from the mass of the graduated cylinder with liquid.) * Trial 1 35.46-25.3=10.16 * Trial 2 36.01-25.39=10.62 * Trial 3: 36.41-26.03=10.38 2. Calculate the density of the unknown liquid for each trial. (Divide the mass of the liquid calculated above by the volume of the liquid.)
Zing Substances. For ionizing substances, such as NaCl , 1mosm is 1mmole times the number of ions formed when each molecule dissociates. One mmole of NaCl is 58 mg, but when it dissociates, it yields 1 mmole of Na+ (23mg) and 1mmole of Cl ( 35mg). Therefore , 58 mg of NaCl is 2 mOsm of NaCl is put into a beaker and distilled water added to make 1 liter, the osmolarity is 2mOsm/l. A) How many mosm solute will 1 gram of NaCl yield?
What amounts of stock solution and water do you need to use? (Remember that you will need enough solution to more than cover the egg.) p. Write up your new dilution procedure in your lab notebook, including the calculated salt concentrations for each cup. q. Make the new dilution series.
How many kilograms of pure HCl would be used to make this hydrochloric acid? (Assume that 30% has two significant figures. There are 2000 lb/ton.) (Obj 15) 30 ton HCl 2000 lb 1 kg ? kg HCl = 6.0 × 105 ton HCl soln 100 ton HCl soln 1 ton 2.205 lb 30 ton HCl 2000 lb 453.6 g 1 kg ?
-Use the titrations of the following chemical reactions: NaHCO3 + HCl (aq) NaCl (aq) + H2O (l) + CO2 (g) 2HCl (aq) + Na2CO3 (s) 2NaCl (aq) + H2O (l) + CO2 (g) Experimental procedure- Two Erlenmeyer flask must be labeled “unknown 1 and unknown 2”. Assure that all containers used are dried and cleaned properly. Two bigger flask are labeled “waste” according to each unknown. A pipette is set up and primed with HCl. The two unknown solids are weighed to a mass of 0.15g each.
Because all forensic scientists are required to have their DNA in CODIS Toxicology Lab: Where is vitreous humor normally located? In the eyes How is a maggot milkshake used? The maggots feed on decomposing bodies so when the maggots are mashed up and tested the results come out with the DNA of the person they were feeding on Why do toxicologists analyze so many different body fluids? Because looking at multiple fluids helps confirm results Who invented Forensic Toxicology? Paracelsus What is the name of the document you signed the evidence out on?
Explain what might have occurred (be sure to explain what conditions had to exist both inside and outside the egg)using all of the following terms: diffusion, semi-permeable membrane, high concentration, low concentration. 2. Draw the egg after it has been in the food coloring for 24 hours. Explain what might have occurred (be sure to explain what conditions had to exist both inside and outside the egg)using all of the
The experiment was divided into two parts using a different apparatus for each part. Part A: For this part of the experiment, the used apparatus was constructed by a pump type Dayton Split phase A.C. Motor 1/5 HP 1725 rpm 115 V sf 1.0 manufactured by Dayton Manufacturing Company, a tank, pipes (L drawn copper tubing type), valves, well type manometer, 1 venturi meter, 1 orifice meter and 4 pressures taps (figure 1). According to Daniel measurement, the theoretical accuracy of orifice meter is +/- 1% and the theoretical uncertainty of venturi meter is +/-1.0 %. Flow calibration is necessary for critical measurement and it results in +/- 0.25 % of uncertainty. The well type nanometer uncertainty is +/-1/2 of the smallest scale graduation.