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Analysis with an elaborate instrument indicates that substance A contains two elements. Substance B and substance C react to give a new substance D. Substance E decomposes upon heating to give substance F and substance G. Heating substance H to 1000°C causes no change. Substance I cannot be broken down into simpler substances by chemical means. Substance J cannot be broken down into simpler substances by physical means. Heating substance K to 500°C causes it to change from a solid to a liquid. Element ? Compound? cannot be classified?
Calculate the voltage difference between two points of corroding iron differing only in their partial pressure of oxygen
How many grams of water can be cooled from 34°C to 11°C by the evaporation of 85 g of water? (The heat of vaporization of water in this temperature range is 2.4 kJ/g. The specific heat of water is 4.18 J/g-K.)
Determine how many moles each of Na+ and Cl- are in 0.700 L of the saline solution (A physiological saline solution contains 167 mEq/L each of Na+ and Cl-.)?
what happend of the particles of the substance in the cup (i) when it is a liquid; (ii) as it begins to evaporate; (iii) when the last bit of liquid has just evaporated.
Consider H2, D2, and H2O, treated as ideal gases as pressures of 1 atm and temperatures of 293.2 K.
Why do solutions of iodide ion in water appear yellow when I- is oxidized to I2 by a suitable oxidizing agent, while solutions of I- in CCl4 or CHCl2 appear violet when the same oxidationis done?
When 6.82x1015 ng of potassium chlorate is heated, how many grams of potassium chloride and oxygen are formed?
what is the maximum amount of sodium chloride that can be separated at 25 ºC by filtration, and what is the mass percentage of sodium chloride in the filtrate?
If the pressure exerted on a 100-L weather balloon changes from 1.0 atm to 2.0 atm, what would be the volume of the balloon at the higher pressure? Assume the temperature does not change and tha balloon has no leaks.
Calculate the final volume of the gas,and express your answer in milliliters and determine the pressure in the flask if the temperature is raised to 25 degree celcius?
Bomb Calorimeter, gross heat of combustion, In the following experiment 1.1651g of benzoic acid (6318 cal/gm) produced a net corrected temperature rise of 3.047C, also 8 cm (2.3 cal/cm) of fuse wire were consumed in the firing.
The resulting solution freezes at 26.5 oC. If Kf for the solvent is 1.74 o C/m then determine the molar mass of the nonelectrolyte compound?
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