What chemical process is involved here
When relatively small amounts of magnesium burn, the fires are extinguished using commercially available dry powder. Why might this fire rekindle days later as someone tries to remove the residue with water? What chemical process is involved here?
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A pn-junction is uniformly doped and has dopant concentration of NA = 4 x1016 cm-3 in the pregion at 300K. At zero bias, 20% of the total space charge region (W) is extended in the pregion.Calculate Vbi, ND, W, xn and xp. Given that ni = 1.8 x 106
If the fuel-to-air ratio is 0.06 and the pressure and temperature in the intake manifold are 1 atm and 285 k, respectively, calculate the power available from the engine - propeller combination at 2800 rpm.
A gas expands and does P-V work on the surroundings equal to 343 J. At the same time, it absorbs 159 J of heat from the surroundings. Calculate the change in energy of the gas.
The voltage drops across three resistors in series are measured 10V, 15V, and 25V. If the largest resistor is 47 ohms, what is the value of the smallest resistor?
A disk has a mass of 4kg and a radius of 90mm, it is at rest when it is placed in contact with the belt, which moves with a constat speed (v =15m/s). knowing that friction is .25 between the disk and the belt. Determine the number of revolution by th
A tank is initially filled with 1000 litres of brine, containing 0.15kg of salt per litre. Fresh brine containing o.25kg of salt per litre runs into the tank at the rate of 4L/s, and hte mixture (kept uniform by vigorious stirring) runs out at
Ethylene glycol, HOCH2CH2OH, is effective as an antifreeze, but it also raises the boiling temperature of automobile coolant. What is the freezing point of a 50.0% solution of ethylene glycol in water?
An aqueous solution of a nonelectrolyte boils at 100.32C. What is its expected freezing point?
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