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10mg of potassium was deposited when a current of 0.5A was passed through fused potassium chloride for 1.5hr at 25°C. Calculate the electrochemical equivalent of potassium at this temperature.
A wave has a wavelength of 0.05m and a wave speed of 10 m/s. What is the frequency of the wave?
Two metal objects are placed in direct contact. Both objects have the same shape and about the same mass. Initially block A has a temperature of 100C and block B a temperature of 20C. After placing the two blocks in direct contact, the temperature of both blocks are again checked and this time the temperature of Block A is 60Cand block B is 60C. How can we explain why the final temperature of both objects are so different? *
Thermochemical changes: Standard Enthalpies of Formation
Fe2O3(s)+3CO(g)→3CO2(g)+2Fe(s) Standard enthalpy change of this reaction is: -24.8kJ
Question: what is the mass of carbon dioxide produced in the above reaction when 250 kJ of energy are released?
4g of sodium is reacted with excess oxygen to make sodium oxide. Work out the mass of sodium oxide produced.
An object has a kinetic energy of 275 J and a momentum of magnitude 25.0 kg * m/s. Find the (a) speed and (b) mass of the object.
what is the expected volume of 10 grams of oxygen gas at STP? given that the volume of 1 mole of a gas at STP is 22.4 Liters
what would happen to the reading of a open end manometer if it was brought up a mountain from sea level?
Determine ΔH for the following reaction.
C4H10 (g) + oxygen (g) carbon dioxide (g) + water (g
C4H10 (g) + oxygen (g) carbon dioxide (g) + water (g
What is aluminum
