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Is the melting of wax a physical or chemical change? from the mass measurement only,( the mass of the candle at 0 minute is 10.1g, after 30 minutes is 7.4g) how could a chemical also be proved to have occured in the burning of candle.( how does this all tie into the law of conservation of the mass?)
The monthly average rainfall data (assumed to fall evenly over the whole watershed of 18 square miles) is as given below. The rainfall pattern repeats every year. The runoff from the land area of the watershed into the lake is 45% of the precipita..
A system conducts 238 cal of heat to the surroundings while delivering 331 cal of work. what is the change in internal energy of the system (in cal).
A mixture of 8.50 g He and 26.5 g Ne has a pressure of 880. mm Hg. What is the partial pressure of each of the gases?
Calculate the molality of a sucrose (C6H22O11) solution containing 14.3 g of sucrose in 676 g of water
Calculate the kinetic energy of a K atom in the beam? b) Assuming that the molecules in the beam move one dimensionaly, what is the temperature of the beam?
The mass of a cube of iron is 379 g. Iron has a density of 7.87 g/cm3. What is the mass of a cube of lead that has the same dimensions?
A baseball weighs 220 g. Top speed for a professional pitcher is about 100 mph when he throws a fast ball. Find the de Broglie wavelength (in nm) associated
In one experiment, 11.5 g of NO formed when 112.4 g of each reactant was used. What is the highest percent yield of N2 that can be expected?
One of the key steps in brewing beer (or brewing root beer, if you prefer) is conversion of starch stored the barley into di- and trisaccharides through a process called "mashing" of the grain
Chromium is produced by reacting its oxide with aluminum. If 76 g of Cr2O3 and 27 g of Al completely react to form 51 g of Al2O3, how many grams of Cr are formed?
has Kp = 45.9 at 763 K. A particular equilibrium mixture at that temperature contains gaseous HI at a partial pressure of 4.00 atm and hydrogen gas at a partial pressure of 0.273 atm. What is the partial pressure of I2?
Determine the number of bonding electrons and the number of nonbonding electrons in the structure of SI2. Determine the number of bonding electrons and the number of nonbonding electrons in the structure of CO2.
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