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A 269 mg sample of rock was found to have 2.45 × 10-6 mol of potassium-40 (t1/2 = 1.3 × 109 yr) and 2.45 × 10-6 mol of argon-40. How old was the rock? What assumption is made about
A 2200 kg car is moving at a speed of 30.0 m/s. Determine the stopping distance (in meters) if the brakes supply a force of 3500 newtons
What is the molarity of C6H12O6 in an aqueous solution that is prepared by dissolving a 20.95 g sample of impure C6H12O6 in water to make 1,450 mL of solution. Assume that the sample is 93% C6H12O6
A 30 cm spring is compressed to 2 cm. a force of 200 N was used to do this. How much potential energy is stored in the spring
A mass is attached to a spring. It oscillates at a frequency of 4/? Hz when displaced a distance of 7.00 cm from equilibrium
If the partial pressure of helium is the same as the partial pressure of oxygen, what do you know about the number of helium atoms compared to the number of oxygen molecules? explain.
A 3.07 kg particle has a velocity of (3.10 i hat - 4.04 j hat) m/s. Find the magnitude and direction of its momentum
The vapor pressure of the water at 16 degrees C is 14 mmHg; CaCO3(s)-->CaO(s)+CO2(g): a) what is the partial pressure of the CO2 gas? b) How many moles of CO2 gas were in the CO2 gas sample
A technician wraps wire around a tube of length 33 cm having a diameter of 7.9 cm, Find the self-inductance of this solenoid
What is the minimum mass of oxygen, in grams, needed to burn 39.7 g C6H6O? Give your answer to three significant figures
A 76 kg sprinter starts a race with an acceleration of 5.8 m/s2, What is the magnitude of the net external force on him in N
Use the activity series to determine which of the following ions will be reduced when an aluminum strip is placed in an aqueous solution of that ion: a)Fe^2+(aq) b)Au^3+(aq) c)Zn^2+(aq) d)H^+(aq) e)
An object with mass 3.2kg is executing simple harmonic motion, attached to a spring with spring constant 260N/m, Calculate the maximum speed attained by the object
Nitrogen dioxide reacts with water to produce oxygen and ammonia; 4NO2(g)+6H2O(g)-->7O2(g)+4NH3(g). At a temperature of 415 degrees C
What volume, in liters, of O2 at 35 degrees C and 1.19 atm can be produced the decomposition of 50.0 g of KNO3? 2KNO3(s)-->2KNO2(s)+O2(g).
A 0.25 m long wrench is placed around a bolt and a 20 N force is applied halfway along the wrench at an angle of 30 degrees, What is the torque (in Nm) applied to the bolt from this force
2NH4NO3(s) delta--->2N2(g)+4H2O(g)+O2(g): a) How many liters of water vapor are produced when 25.8 g of NH4NO3 decomposes? b) How many grams of NH4NO3 are needed to produce 10.0 L of oxygen
Determine the molar mass of each of the following gases: a) 2.90 g of a gas that occupies 0.500 L at 0 degrees C and 1.00 atm (STP); b) 1.43 g of gas that occupies 2.00 L at 0 degrees C and 760 mmHg
A juggler throws a ball straight up with some initial velocity. Half a second later, the juggler throws another ball straight up from the same height, then what is the initial velocity of each ball
A 0.5 kg dart is fired vertically from a spring gun that has spring constant of 4000 N/m. Determine maximum height reached by dart.
A 10.0-g sample of krypton has a temperature of 25 degrees C at 575 mmHg. What is the volume, in milliliters, of the krypton gas
The Black body radiation emitted from a furnace peaks at a wavelength of 4.1 x 10^-6 m (0.0000041m)
a)the anode b)the cathode c)the half reaction at the anode d)the half reaction at the cathode e)the overall reaction f)the shorthand cell notation
What is the IUPAC name for a molecule with a tert-butyl chain binded to the 3rd carbon of a cyclopentane, with an OH at the top (on first carbon)