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Jack and Jill exercise in a 25.0-m-long swimming pool. Find the average velocity and average speed of each swimmer
The required ionic concentrations are Na+=2.45M; K+=.0086M; Mg2+ =.0517M; Ca2+=.0109M, HCO3-=.0025M, CL-=2.48M; SO4 2-=.0486M
The general molecular formula for alkanes is CnH2n+2. What is the general molecular formula for cycloalkanes with two rings
For the gas phase decomposition of C2H5Cl, a graph of ln t versus 1 / T produced a straight line with a slope of 2.98 × 104 K. What is the activation energy for this reaction
A 70.0 cm thick layer of oil floats on a 120 cm thick layer of water. What is the pressure at the bottom of the water
What is the hydronium ion concentration of a 0.500 M acetic acid solution with Ka = 1.8 x 10-5. The equation for the dissociation of acetic acid is: CH3CO2H(aq) + H2O(l) <---> H3O+(aq) + CH3CO
A 75 g piece of ice at an initially unknown temperature is placed into a glass of 350 g of water sitting at room temperature, What is the specific heat capacity of the unknown metal
computer chips are etched on circular cylinder wafers of thickness 0.60mm that are sliced from a solid cylindrical silicon crystal of length 30cm
What is the average mass(in grams) of a flourine atom if Flourine has an atomic weight of 18.998 amu
A soccer ball lying on the ground is kicked with an initial velocity of 10.0 m/s at an angle of 37 degrees above the horizontal
A glass flask at 0 degrees Celsius is filled to the brim with 1000 cm(^3) of mercury, what is the coefficient of volume expansion in the glass
A cooking vessel on a slow burner contains 11.2 kg of water and an unknown mass of ice in equilibrium at 0°C at time t = 0. determine the initial mass of ice
A circular wheel has a radius R = 0.45 + or - 0.02 m. The wheel is observed to be rotating uniformly with period T = 2.00 +or- 0.05 s. Compute the frequency with which the wheel spins
A solution consists of 3.88 g benzene,C6H6 , and 2.45 g toluene ,C6H5CH3. The vapor pressure of pure benzene at 20. °C is 75 mm Hg and that of toluene at 20.0 °C is 22 mm Hg.
When my car has been parked for a while, its tires look a wee bit ‘low,' and, when their pressure is measured at 23 C, What is the temperature of the air inside the tires
Phenol is a weak organic acid with Ka=1.0x10^-10. How many grams of phenol do you need to add to 500. mL of water to make a pH=5.75 solution
To determine [Fe3+] in an unknown solution, 1.00 mL of the solution was diluted to 50.0 mL. After addition of excess SCN-, the absorption of the standard solution =0.193 at 580 nm. What is the [Fe3+
propose a structure for an amine of formula C4H9N, which liberates a gas when treated with NaNO2 and HCl. The 13C NMR spectrum is as follows with attached protons in parentheses: delta 14 (2), delta
An amount of ideal gas is con?ned to a sealed box at one-half atmospheric pressure, i.e., 50.65 kPa. What is the new pressure of the gas in the smaller box
Find the molarity of each ion present after mixing 27 mL of 0.25M HNO3 with 36.0ml of 0.42 M Ca(NO3)
A projectile is fired into the air from the top of a cliff of height h = 198 m above a valley. Where does the projectile land
Dilute the solutions of NaCl, Na2So4 and Na2S are available to seperate the positive ions from each other. In order to effect seperation, the solutions should be added in which order
It has been proposed to save fuel in air travel by reducing the air speed. How much fuel is saved in a 2000 mile trip
You have 135.8 mL of a 2.50, solution of Na2Cr04 (aq). You also have 125 mL of a 2.50 M solution of AgNO3. Calculate the concentration of Na+ after the two solutions are mixed together.
How much heat in Joules was lost by the water. How much heat would be lost by the water if 1 mole of KCl had dissolved. c) What is (Delta Heat reaction) in kL/mole for this process, which can be wri