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Certain metals can be extracted from their salts (usually halides: those containing Group 17 elements such as chlorine, fluorine, bromine or iodine) by the process of electrolysis. In a typical electrolysis cell like that in the diagram, a sample of magnesium chloride (MgCl2) was placed and heated until molten. From the list below, select the three true statements with regards to the electrolysis of magnesium chloride: (i) Molten magnesium chloride conducts electricity and so allows the circuit to be completed in the electrolysis cell.(ii) Molten magnesium chloride does not conduct electricity.(iii) The chloride ions are reduced at the anode to give Cl2 gas.(iv)The chloride ions are oxidised at the anode to give Cl2 gas.(v) Magnesium ions are reduced at the cathode to give magnesium atoms.(vi) Magnesium ions are oxidised at the cathode to give magnesium atoms.
a 5.00 gram sample of potassium chlorate/potassium chloride mixture was heated in a test tube. A total of 1.00 L of oxygen gas was collected over water at 25 degrees c and 741 torr. determine the percentage of potassium chlorate in the mixture.
The molar mass of cellulose is approximately 6.0 x 10^5 g/mol and the molar mass of a soluble starch is on the order of 4.0 x 10^3 g/mol. The monomer unit in both of these molecules has the emperical formula C6H10O5.
what is the pressure in atmospheres of the gas inside the container connected to an open-end mercury-filled manometer
Raidum-226 (atomic mass=226.025402 amu) decays to radon-224 (a radioactive gas) with a half-life of 1.6 x 10^3 year. What volume of radon gas a (25 degrees C and 1.0 atm) is produced by 1.0 g of radium in 5.0 days
Determine the oxidation numbers of each elements in the following reaction, identify which of them are oxidized or reduced, if any: 2MnCO3(s)+O2(g) ---> 2MnO2(s)+2CO2(g)
Write the balanced equation for the ionization of the weak base pyridine, C5H5N, in water, H2O. Phases, such as (aq) or (l), are optional.
Calculate the pH of the solution that results from adding 28.0ml of 0.100M NaOH to 50.00 mL of a 0.0500 M solution of hydrochloric acid
In the following experiment, a coffee-cup calorimeter containing 100. \rm mL of \rm H_2O is used. The initial temperature of the calorimeter is 23.0
needed to titrate 45.25 mL of NaOH. Calculate the moles of NaOH needed for the reaction. Calculate the Molarity of the NaOH solution
A solution of Na2CO3 is added dropwise to a solution that contains 1.14Ã-10âˆ'2 M Fe and 1.53Ã-10âˆ'2 M Cd . What concentration of CO3 is need to initiate precipitation?
Magnesium burns in oxygen gas to produce magnesium oxide. What mass of magnesium will react with a 0.25 L container of oxygen gas at 80oC and 770 mmHg?
The hydrogen carbonate ion can act as both an acid and a base. Write out two equations which demonstrate this and calculate (or look up) the equilibrium constants for both expressions
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