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What is the half-life of a compound if 81percent of a given sample of the compound decomposes in55 min? Assume first-order kinetics
Explain why it is necessary to remove the Erlenmeyer flask from the hot water bath at the moment the volatile liquid disappears from the flask, rather than while there is still water liquid in the f
Calculate the total heat change, the ΔE, the PV work, and the ΔH when 54 g of ice is converted into54g of steam. [H2O(s) at -10°C converted toH2O(g) at 110°C].
Ashlee pulls Andy on a skateboard. Ashlee pulls with a force of 52.2N to get it moving and 42.0N to keep it at a constant velosity. The mass of the skateboard and Andy are 75.0-kg. What is the Coeff
Argon crystallizes in the face-centered cubic arrangement at 40 K. Calculate the mass of the unit cell of solid argon in grams.
A circus performer stretches a tightrope between two towers. He strikes one end of the rope and sends a wave along it toward the other tower. He notes that it takes the wave 0.755 s to reach the opp
Heating oil is circulated in a circular conduitat an average velocity of 0.30 m/s. The diameter of the conduit is25 cm. The density of the oil is 810kg/m3.
A harmonic wave is traveling along a rope. It is observed that the oscillator that generates the wave completes 43.0 vibrations in 34.0 s. Also, a given maximum travels 430 cm along the rope in 9.0
A pendulum clock that works perfectly on Earth is taken to the Moon. Assume that the free-fall acceleration on the Moon is 1.63 m/s^2.
Two ideal gases, A and B, are at the same temperature, volume andpressure. Gas A is reversibly expanded at constant temperature to avolume V.
A man enters a tall tower, needing to know its height. He notes that a long pendulum extends from the ceiling almost to the floor and that its period is 21.5 s. (a) How tall is the tower?
Explain why the carbonyl group ( C=O ) group of methyl benzoate is a m-directing group. would you expect methylbenzoate to undergo EAS reaction such as nitration faster or slowerthen benzene? why?
Calculate the amount of Ca(NO3)2 x4H2O(s) needed so that the Ca2+ isin excess of the iodate ion concentration by 20% (i.e., calculate aweight of calcium nitrate that is 20% higher than the minumum r
When four people with a combined mass of 320 kg sit down in a car, they find that the car drops 0.50 cm lower on its springs. Then they get out of the car and bounce it up and down. What is the freq
A 0.39-kg object connected to a light spring with a force constant of 20.2 N/m oscillates on a frictionless horizontal surface. The spring is compressed 4.0 cm and released from rest. (a) Determine
What was the speed of the car before impact, assuming no energy is lost in the collision with the wall?
(a) What is the potential energy stored in the two bands together when a 40-g stone is placed in the cup and pulled back 0.15 m from the equilibrium position? (b) With what speed does the stone leav
A spring is hung from a ceiling, and an object attached to its lower end stretches the spring by a distance of 5.00 cm from its unstretched position when the system is in equilibrium. If the spring
The air in a bicycle tire is bubbled through water andcollected at 25 degrees Celsius. If the total volume of gas collectis 5.45L at a temperature of 25 degrees Celsius and a pressure of745 torr, h
A wooden cylinder 30.0cm high floats vertically in a tub ofwater with density = 1.00g/cm3 . The top of the cylinderis 14.1 cm above the surface of the liquid. What is the density of the wood?
Suppose that a 6.14-m/s wind is blowing across the roof of your house. The density of air is 1.29 kg/m3. Determine the reduction in pressure (below atmospheric pressure of stationary air) that accompa
The intensity (in W/m2) of one sound is 6.94 times as great as the intensity of another sound. Relative to the quieter sound, what is the intensity level ß of the louder sound?
By what factor does the rate of the reaction with the following rate law change if the concentrations of NO2 andCl2 are doubled. Rate =k[NO2]2[Cl2]. Express answer as whole number.
What voltage would you expect based on the joule tomson coefficient value for CO2 if op amp is set to 100 for a pressure drop of 90 psi across frit for this gas?
What volume of H2 could be produced at atemperature of 13 oC and a pressure of 760 torr by the reaction of 2.01 g of aluminum with hydrochloric acid?