Le Chatelier's Principle in Iron Thiocyanate Equilibrium QUESTIONS 1. Write the equilibrium constant expression for the reaction between Fe" and SCN". 2. Based on your observation in test tube 10, is the reaction between Fe" and SCN exothermic or endothermic? 3. Write the net ionic equations of any reactions that occur in test tubes 4 to 9. (Use the table given.) 4. When equilibrium is once more established in test tube 8, how do the concentrations of Fe", SCN", and FESCN* with their concentrations before adding the Na;C,O,? compare

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There are 2 boxes for each reactant and product. Type the coefficient in the first box and the chemical formula in the second. Enter the chemical formulas in the order they appear in the problem. Each box must have a coefficient or formula. Type in a "1" if you did not change the coefficient. Type the formula in this format: CO_2. Omit the subscript "1" in the chemical formulas. This is case-sensitive. Carbon monoxide reacts with iron(III) oxide to produce iron and carbon dioxide.

What is calibration and why is it essential in relation to food analysis? Provide examples.

Many common materials that we ingest, though quite safe in reasonable quantities, become toxic when taken in very large doses. A measure of toxicity is the LD50 value (Lethal Dose, 50%). It is the quantity of material, expressed in mg of material per kg of subject-body-weight that, if administered to a population of subjects, would cause 50% of the population to die. The LD50 value for FD&C Red Dye No. 40 is >10,000 mg/kg in rats. Assume that the LD50 value for humans is the same as for rats. Calculate the number of mg of Allura Red present in an 8 fluid ounce glass of the beverage you used in this lab. Assume that the concentration of Allura Red in the beverage is 0.000054 M. The molar mass of Allura Red is 496.42 grams/mol 1 fl oz = 29.5735 mL Do not include units with your answer.

Suppose some measurements are made on two different homogeneous stones to find out if they are made of the same kind of rock. The mass and volume measurements are listed below. Are the two stones the same type of rock? Why or why not? Show all calculations. Mass Volume Calculations Stone 1 58.0 g 20.0 cm Stone 2 50.1 g 15.0 cm3 21/common/assets/pdfjs/1.0.0.30/web/viewer.ht...ndered-pdf&fullscreen=Dd21-fileviewer-rendered-pdf-dialog&height=746#0

You have a 11.5 mg sample of blood that contains various proteins. Hemoglobin is the only protein in the sample containing Fe. Hemoglobin contains 3.83% by mass of a compound called heme (C₃₄H₃₂FeN₄O₄, MW = 616.49 g/mol). You find that your 11.5 mg blood sample contains 34.9 micrograms of Fe. What is the mass percent of hemoglobin in your protein sample?   -don't prematureley round