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americium-241 is used in smoke detectors it has a first order rate constant for radioactive decay of k16 x 10-3 yr-1 by
a deep-space probe moves away from earth with a speed of 074c an antenna on the probe requires 30 s in probe time to
an astronaut is traveling in a space vehicle that has a speed of 0500c relative to earth the astronaut measures his
2 moles of ideal gas at 300k with an initial volume of 25l are compressed under an external pressure of 2800 torr
an astronaut at rest on earth has a heartbeat rate of 72 beatsmin when the astronaut is traveling in a spaceship at
show the correct expression for the equilibrium in the reaction of benzoic acid with methanol to form methyl benzoate
derive a rate law for the exothermic reaction 2o3 3o2 based on the following mechanism and draw the corresponding
two hockey pucks a and b on a frictionless surface are coverd with velcro both pucks have a mass of 50kg puck a is
40 moles of methanol is allowed to react with 10 moles of benzoic acid to form methyl benzoate and water after the
pendulum a small rock with mass 022 kg is fastened to a massless string with length 070 m to form a pendulum the
methanol ch3oh is manufactured by the reaction of carbon monoxide with hydrogen in the presence of a znocr2o3
what is the minimum quantity of atmospheric oxygen required to completely convert 030 moles of propan-1-ol into carbon
a plane electromagnetic wave with wavelength 18 m travels in vacuum in the positive direction of an x axis the electric
assume you live in a medium-sized city of 150000 people and that 660 l of water is consumed per person per day what
to make sure that the white powder was all sodium chloride and not mixed with sodium hydrogen carbonate would you need
a 59 h coil with a resistance of 84960 ohm is in series with a 373824 ohm resistor this circuit is connected to an ac
when a certain liquid of molar mass 461 gmol freezes at -365 degrees celsius its density changes from 0789 gcm3 to 0801
pressure was exerted with a piston on molten naphthalene at 95 degrees celsius the vapour pressure of naphthalene
if you have a 11 m solution of hcl how many milliliters of a 0150 m magnesium hydroxide soultion are needed to
a particular laser consumes 1400 watts of electrical power and produces a stream of 259times1019 photonssecond 1012nm
white gas is a mixture of c5 compounds and c6 compounds the heavier hydrocarbons in white gas are hexanes c6h14given
using data from the following reactions and applying hesss law calculate the heat change for the slow reaction of zinc
sucrose table sugar has the formula c12h22o11 molar mass 34230 gmol and a food value of 649 kjg determine the
calculate the final temperature of a mixture of 1500 g of ice initially at -135 degrees celsius and 3450 g of water
dry air is bubbled through 25 litres of water at a rate of 15 litres stpmin the air leaving the liquid is saturated