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A substance gives a positivexanthoproteic test and a positive Hopkins-Cole test but a negativebiuret test. What might the substance be?
A police car is moving at 36.7 m/s (82.1 mi/h) behind a speeding car that is going faster. The speed limit is 29.1 m/s (65.0 mi/h). A police car radar "clocks" the speed of the other car by emitting
Why do you suppose only symmetrical ethers are prepared by the sulfuric acid -catalyzed dehydration procedure?
A heavy drape, hung close to a cold window, reduces heat loss considerably by interfering with heat transfer. Which heat transfer process would be most affected by the drape and why?
A satellite circles the earth in a circular orbit of radius of R where R is the distance from the center of the earth. A second identical satellite circles in an orbit that is at twice the distance
The heat fusion of pure silicon is 43.4 kJ/mol. How much energy would be needed to melt a 5.24 - g sample of silicon at its melting point of 1693 K?
If 226 kJ of heat increases the temperature of 47.0 kg of copper by 12.5 degrees Celsius, what is the molar heat capacity of copper?
The intensity of the sunlight that reaches Earth's upper atmosphere is approximately 1330 W/m2. (a) What is the total average power output of the Sun, assuming it to be an isotropic source?
CO(g)+Cl2(g)↔COCl(g)+Cl(g) . Kenetic studies indicate that the rate constant for the forward reaction,Kf is 1.38x10-28 M/s; for the reverse reaction kR= 9.3x 1010M/s( both rate con
(a) What is the time constant of the circuit? (b) What is the potential difference (in V) across the capacitor at t = 19.0 s?
When, according to the clock attached to the nose of the spaceship, is the signal received?
At 450 K the equilibrium concentrations for the followingreaction were measured and used to calculate the Kc value of0.0321. What is the value of Kp for the reverse reaction under same conditions?&n
Three resistors all have resistance 30 W . What are the largest and smallest equivalent resistances that can be created with these three resistors?
The girl pushes the boy hard, sending him backward with a velocity 2.10 m/s toward the west. Ignore friction. How much potential energy in the girl's body is converted into mechanical energy of the
Suppose you have separated molecules from a mixture by column chromatography, and there is a color overlap.What do you think might be the cause and how could the procedure be modified to get a bette
A 0.405-µF capacitor is connected across the terminals of a variable frequency oscillator. (a) What is the frequency when the reactance is 5.88 kO?
(a) Find the common speed the two gliders have when the spring is at maximum compression. (b) Find the maximum spring compression distance.
Calculate the amount of ammonium chloride that must be dissolved in 0.75L of water to produce a solution of pH 5.25 Please show all your work and explain.
Air is 78.0% Nitrogen molecules and 21% Oxygen molecules. What is Nitrogen partial pressure at atmospheric pressure of 1 atm?Assume ideal behavior.
The object is pulled down an additional 15.5 cm and released from rest to oscillate without friction. What is its position x at a moment 84.4 s later? Find the distance traveled by the vibrating obj
A variable capacitor with negligible resistance is connected to an ac voltage source. By what factor does the current in the circuit increase if the capacitance is increased by a factor of 6.0 and t
What is the pH of a buffer solution containing 35.0 g of NH4Cl dissolved in 1.00 L of 1.00 NH3?Kb of NH3 = 1.8 x 10-5 How many moles of HCl are required to change the pH of this solution by
The astronaut is strapped into a seat 4.00 m from the axis. What is the astronaut's tangential acceleration during the first 40.0 s?
Determine the concentration of the species present at equilibrium if 0.10 mol of ethylenediamine is dissolved in 2.00 L of asolution that contains 6.5 x 10-3 M Ni2+.Kf of [Ni(en)3]2+