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when taking a tlc plate and recording the Rf values what must you always write down in order for someone else to be able to reproduce your work
Electrolysis - Aluminium extraction, a. Aluminium is extracted from its ore by an electrolytic process. One extraction plant uses an applied e.m.f. of 5 V, and a current of 225 000 A. One tonne of aluminium is extracted after 14 hours.
a sample of a binary compound of boron and chlorine weighing 2.842 g occupies .153 L. this sample is decomposed to give 0.664 g solid boron and enough gaseous chlorine to occupy .688 L at the same temperature and pressure. determine the molecular ..
The rate constant for a certain chemical reaction is. 0.0125 L mol^-1 s^-1 at 25 degree Celsius and 0.0125 L mol^-1 s^-1 at 50.0 Celsius. What is the activation energy for the reaction, expressed in kJ mol^-1
If carbon dioxide gas is collected over water at 25C and 775 torr, what is the partial pressure of the CO2? The vapor pressure of water is 23.8 torr at 25C.
The gas remaining in the bottle slowly warms up to 285 K. What is the final pressure in the bottle for a monatomic gas, for which CV = 3R/2, and for a diatomic gas, for which CV = 5R/2?
A 0.4564 g sample of a pure soluble bromide compound is dissolved in water, and all of the bromide ion is precipitated as AgBr by the addition of an excess of silver nitrate. The mass of the resulting AgBr is found to be 0.8815 g.
The Solubility of Silver Bromide at 100 Celsius degrees is 0.00037 grams for 100 grams of water. Calculate Ksp for Silver Bromide at this Temperature.
What is the half-life of a compound if 78 percent of a given sample of the compound decomposes in 45 min? Assume first-order kinetics.
Calculate the pH of the solution that results when 20 ml of 0.100 M CH3COOH is mixed with 10.00 mL 0.200 M NaOH
Calculate the theoretical yield of C2H5Cl when 139 g of C2H6 reacts with 232 g of Cl2 , assuming that C2H6 and Cl2 react only to form C2H5Cl and HCl .
What is the heat change of H 2 O If the final temperature of the mixture = 25 degree celsius?
Explain would the calculated molarity of NaOH be too high or too low If the KHP weighed in your experiment today was contaminated with some unknown inert substance.
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