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A certain lightbulb has a tungsten filament with a resistance of 18.0 when cold and 138 when hot. Find the temperature of the hot filament
A solution of H2SO4 (aq) with a molal concentration of 6.80 m has a density of 1.318 g/mL. What is the molar concentration of this solution
Two identical spheres are placed with centers 0.25 m apart, one is given a charge 20nC and the other-36nC, what will be the electric force each exerts on the other
The tricky part of this multi-step synthesis is the isolation of the neutral p-aminobenzoic acid in the second step. Why is this isolation so difficult
A uniform thin rod of length 0.778 m is hung from a horizontal nail passing through a small hole in the rod located 0.043 m from the rod\'s end
At 25 degrees C, what are the molar H3O+ and OH- concentrations in (e) 0.200 M NaOCl? (f) 0.0860 M CH3CH2COONa
An electron of mass 9.11×10?31 leaves one end of a TV picture tube with zero initial speed and travels in a straight line to the accelerating grid, Find the Time to reach the grid
this is a post lab question: you did not correct for the barometric pressure for the vapor pressure of water. what happens to your calculations
The aorta carries blood away from the heart at a speed of about 40 cm/s and has a radius of approximately 1.1 cm. find the approximate number of capillaries in the human body
for the experiment with eudiometer, you did not correct for the barometric pressure for the vapor pressure of water.
what differences would you expect to observe. Would the order of reaction change with respect to the dye? Would the rate constant change
A space traveller weighs herself on Earth, at a location where the acceleration due to gravity is 9.82 m/s2, and finds a value of 571 N. What is the traveller\'s mass on the planet
Two parallel metal rods form a plane inclined at 20.0° to the horizontal. The upper end of the rods are connected together by a resistor of 102.0 ?. What is the maximum speed of the bar
A lamp (R = 148 ), an electric heater (R = 23 ), and a fan (R = 48 ) are connected in parallel across a 117 V line. What is the voltage across the fan
What changes would I make in my experimetal procedure to determine the rate law for the oxidation of red dye by sodium hypochlorite
A nuclear power reactor generates 4.2 × 109 W of power. In one year (365.25 days), what is the change in the mass of the nuclear fuel
A 1.90 × 102-kg sculpture hangs from a horizontal rod that serves as a pivot about which the sculpture can oscillate. How far is the pivot from the sculpture\'s center of mass
Aluminum readily displaces hydrogen in sulfuric acid according the following balanced reaction: 2Al(s) + 3H2SO4(aq) = Al2(SO4)3(aq) + 3H2(g). How many moles of Al and how many moles
A news station in your local area has predicted a severe winter storm on the way and they want to make sure the streets don't freeze over. Which solution should they use to put on the streets to low
A sophomore with nothing better to do adds heat to 0.440kg of ice at 0 oC until it is all melted. The source of the heat is a very massive body at a temperature of 25.0 oC. What is the change in entro
A Carnot engine is operated between two heat reservoirs at temperatures of 530K and 300K. What is the thermal efficiency of the engine
How many mL of Br2 (l) with a density of 3.12 g/mL must you dispense to have 1.56 mole (mol) of Br2 (l).
A reaction yields a colored product and the absorbance at a given wavelength increases at 0.2 per minute. The molar absorbtivity of the product is 4.0 ?M-1cm-1. What is the rate of product formation
An ice-making machine operates in a Carnot cycle. It takes heat from water at 0.0 oC and rejects heat to a room at 24.0 oC. How much energy must be supplied to the device
A heat engine is to be built to extract energy from the temperature gradient in the ocean. what is the maximum efficiency such an engine can have