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Compare the amount of .200 moles of KOH needed to neutralize 50 mL of .200 moles of HNO3 with the amount of .200 moles of KOH needed to neutralize 50 mL.
A cannon is fired from the top of a castle wall. The cannonball is fired at a speed of 50 m/s and an angle of 30 degrees. A cannonnall that was accidently dropped from the top of the wall hits the
Consider the sodium sulfate/sodium bisulfate (Na2SO4/NaHSO4) buffeer system where Ka=1.1*10-2 for HSO4-. How Many grams of wach of these salts should you add to 1L of water in order to make the buf
A car drives straight off the edge of a cliff that is 49 m high. The police at the scene of the accident observed that the point of impact is 130 m from the base of the cliff. How fast was the car t
Block 1, of mass M1= 0.550, is connected over an ideal (massless and frictionless) pulley to block 2, of mass M2. Assume that the blocks accelerate as shown with an acceleration of magnitude a= 0.35
A mixture of 0.1079 M CO (g) and 0.1079 M H2O(g) was allowed to react and come to equilibrium at some temperature. If Kc = 5.668, what is the equilibrium molar concentration of H2 for the reaction?
Moe and Joe take a car trip. Moe drives at an average speed of 38 mph for the first hour and then they stop for gas for 10 minutes. After filling gas, Joe drives at an average speed of 30 mph for 40
A 30.5-g sample of an alloy at 93.0°C is placed into 50.0 g of water at 22.0°C in an insulated coffee cup with a heat capacity of 9.2 J/K. If the final temperature of the system is 31.1°
A calorimeter contains 18.0 mL of water at 12.0, ^{circ}C. Calculate the enthalpy change, Delta H, for this reaction per mole of rm X
One electron collides elastically with a second electron initially at rest. After the collision, the radii of their trajectories are 1.00 cm and 2.40 cm. the trajectories are perpendicular to a unif
Suppose that a certain atom possesses four distinct energy levels.Assuming that all transitions between levels are possible, how manyspectral lines will this atom exhibit? Which transitions corresp
A standard men's basketball has a circumference of 29.5 inches. If I fill the ball with Helium to the recommended 9.0 psi at room temperature (25 C), how many grams will the Helium in the ball
A more realistic model of such a magnet can be derived by assuming a constant magnetization throughout M=kz. where k is constant and z is the main axis.
A sample of 0.600 moles of a metal M reacts completes with excess of fluorine to form 46.8g of Mg2. How many moles of F are present in the sample of MF2 that forms?
A wire carries a current of 9.8 A in a direction that make an angle of 32.4? with the direction of the magnetic field of strength 0.262 T. Find the magnetic force on a 5.4 m length of the wire.
Calculate the average speed of an oxygen gas molecule,o2 , at 25.0.
Two air carts of mass = 0.80 and = 0.44 are placed on a frictionless track. Cart 1 is at rest initially, and has a spring bumper with a force constant of 690 . Cart 2 has a flat metal surface for a
How much work is done by the system when 2.00 moles of O2 expand from a volume of 3.00 liters to a volume of 3.5 liters against a constant external pressure of 0.0100atm? Answer in units of J.
Find maximum and minimum frequencies of sound detected by the detector, if vibration frequency of each block is 3.5Hz.(sound velocity is 330m/s).
A cook wants to heat 2.00 of water from 35.0 to 100.0 .If he uses the combustion of natural gas (which is exothermic) to heat the water, how much natural gas will he need to burn? Natural gas produ
Consider a local concentration of 106 units per cm3 which drops by 10% over a distance of 1 cm. Then the gradient is -105 [units cm-4]. Assume the diffusivity is 103 [cm2/s]. Calculate the flux.
A chemist wanted to determine the concentration of a solution of lactic acid, HC3H5O3. She found that the pH of the solution was 2.59. What was the concentration of the solution?
From the damage sustained, police estimate that the car was moving at 18 at the time of the collision. They also measure skid marks 34 long. How fast was the motorist going when the brakes were firs
Balance the following molecular equations for these reactions. Write the ionic equation for the reactions. Write the net ionic equation for the reactions.
Chlorophyll found in plant cells and essential to the process of photosyntheses, contains 2.72% Mg by mass. Assuming one magnesium atom per chlorophyll molecule, calculate the molecular mass of chl