Identify the element in the test tube
Identify the element in the test tube. Is sugar one of the elements? When sugar is burned a black material is left in the test tube along with what appears to be drops of water on the side.
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Explain why can methyl orange or phenolphthalein be used for an HCl-NaOH titration, but only phenolphthalein is suitable for acetic acid-NaOH titration?
What is the vapor pressure at 20C above a solution that has 85.5g of sucrose and 75 g of urea [CO(NH2)2] dissolved per kg of water when the vapor pressure of pure water at 20C is 17.5 torr.
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What mass of N2 gas was collected? At 20º C, the vapor pressure of water if 17.5 torr. A sample of N2 gas was collected over water at 20º C at a total pressure of 1.00 atm. A total volume of 250.0ml was collected.
At 4062 minutes after a particular experiment had begun, the HI concentration was equal to0.00045 mol/L. The second-order rate constant for the decomposition of HI at700 °C is 1.6*10-3L/mol/s.
A particular drug used in animals is eliminated metabolically by a first-order process in such a way those 2.76 hours after the initial dose of 29.7 mg/kg body weight had dropped to a level of 13.6 mg/kg bodyweight.
What is the rate constant for the reaction in the units' min-1if it takes 68.9 minutes for the concentration of a reactant to drop to 20% of its initial value in a first-order reaction?
Write down the mathematical expression/equation for calculating inherent error of NA (i.e. Na/Na) The equivalence point is the point when the number of equivalents acid equals to the number of equivalents of base.
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