A weather balloon at ground level where the pressure is 725 mm Hg and the temperature is 13°C has a volume of 258 L. The balloon ascends to an altitude 2500 ft where the temperature is -22°C . The volume of the balloon increased to 375 L. What is the pressure inside the balloon at 1500 ft.

A student determined fluoride in a toothpaste sample using ion chromatography. A toothpaste sample of mass 0.100 g was dissolved in type I water and then quantitatively filtered through a Whatman #1 filter paper into a clean 100 ml volumetric flask. The flask was then made up to volume with type I water and mixed thoroughly.A portion of the solution was filtered through a 0.45 um filter into a sample vial for analysis. Analysis of the sample gave a fluoride concentration of 1.60 mg/l Calculate the % w/w fluoride in the original toothpaste sample. (Give your answer to 3 decimal places please)

Please give information about these chemicals.

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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.

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Balance each of the following neutralization reactions. Part A HNO, (aq) + Sr(OH)2(s)→H20(1) + Sr(NOs)2(aq) Express your answer as a chemical equation. Identify all of the phases In your answer. ΑΣφ ? DA chemical reaction does not occur for this question. Submit Request Answer t Speec.pdf