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Explain why this atomic orbital arrangement cannot account for the observed bonding in NH3. Explain briefly the hybridization that must take place.
A golf ball sitting of the surface of an unknown planet is struck by a golf club such that it is launched from the surface with an intial speed of 30.0 m/s at an angle of 20.0 degrees above the hor
A car starts from rest on a curve with a radius of 160 m and accelerates at 1.80 m/s^2. How many revolutions will the car have gone through when the magnitude of its total acceleration is 2.10 m/s^2
If the acyloin condensation were carried out with 4.60m Lbenzaldehyde (density = 1.04g/mL), 1.48 thiamine hydrochloride, and5.2mL 2.0M aqueous NaOH, what is the limiting reagent?
Sam, whose mass is 70.0 kg, takes off down a 46.0 m high, 8.00^\circ slope on his jet-powered skis. The skis have a thrust of 180 N. Sam's speed at the bottom is 42.0 {\rm m/s}. What is the coeffici
Iron crystallizes in a body-centered cubic structure. The volume ofone Fe atom is approximately 8.38x10-24cm3, and the density of Fe is 7.874 g/cm3.Calculate an approximate value for Avogadro's number
The bullet remains embedded in the block, which is observed to slide a distance 0.260 m along the surface before stopping. What was the initial velocity of the bullet?
If the potential energy of the pendulum-Earth system is taken to be zero at the stone's lowest point, what is the total mechanical energy of the system?
How many silver atoms are present in a vapor colume of 486 mL whenAg(l) and Ag (g) are in a equalibrium at 1360 degree celcies? (vapor pressure of silver at 1360 degree celcius==1.00mmHg.
A solution contaning 2.00g of an unknown substance in25.0g of naphthalene was found to freeze at 75.4 degrees celsious.what is the molar mass of the unknown substance?
A sledge loaded with bricks has a total mass of 18.0 kg and is pulled at constant speed by a rope inclined at 19.1° above the horizontal. The sledge moves a distance of 20.4 m on a horizontal su
A Mercedes-Benz 300SL (m = 1850 kg) is parked on a road that rises 15° above the horizontal. (a) What is the magnitude of the normal force?
How do you construct an electron dot expression for the change that occurs when an atom of zinc is converted to a Zn2+ ion?
A proton cyclotron has a magnetic field of .20T between it's poles and a radius of .40m. What is the maximum energy for the protons from this machine?
In a game of basketball, a forward makes a bounce pass to the center. The ball is thrown with an initial speed of 4.3 at an angle of 15 below the horizontal. It is released 0.90 above the floor. Wh
An object is placed in front of a concave mirror, 27.0 cm from the mirror's focal point. The image formed by the mirror is five times farther away from the focal point. Calculate the focal length of
In this experiment, 0.170g of caffeine is dissolved in 10.0 mLof water. the caffeine is extracted fromt he aqueous solution three times with 5.0 mL portions of methylene chloride.
Given that the focal length of the eyepiece is 2.79 cm, and the focal length of the objective is 0.511 cm, calculate the magnitude of the angle subtended by the red blood cell when viewed through th
The concentration of a chemical degrades in water ccording tofirst-order kinetics. The degredation constant is 0.2day-1. If the initial concentration is 100.0mg*L-1, how many days are required for the
How would the rate of disappearance of ethylbromide change if the solution were diluted by adding an equal volume if pure ethyl alcohol to the solution?
A 5-g lead bullet traveling in 20oC air at 300m/s strikes a flat steel plate and stops. What is the final temperature of the lead bullet? (Assume the bullet retains all heat.) The melting point of l
Two small plastic spheres, one charged to 21 nC and the other to -21 nC, are connected by a 26-mm-long insulating rod. Suppose this dipole is placed in a uniform electric field with strength 7.4*10^
A tank with a volume of 0.150 m3 contains 27.0oC helium gas at a pressure of 100 atm. How many balloons can be blown up if each filled balloon is a sphere 30.0 cm in diameter at 27.0oC and absolute
A certain liquid has astandard enthalpy of vaporization of 26.0 kJ/mol. Determine the energy exchanged with the surroundings as heat during the process of vaporizing 0.50 mol at 250 K and 750 Torr.
A proton is released from rest just outside the surface. How far will it be from the surface of the cylinder when its speed has reached 2550 km/s? The mass of the proton is 1.67 × 10-27 kg and