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The focal length of a relaxed human eye is approximately 1.71 cm, Calculate the focal length of the eye when we focus closely
An airplane pilot wishes to fly due west. A wind of 72.0 km/h is blowing toward the south, What is the speed of the plane over the ground
The activity coefficients of the Mg2+ and Cl- ions in this solution. The mean ionic activity coefficients of these ions.
In compressing the spring in a toy dart gun, 0.9 J of work is done. When the gun is fired, the spring gives its potential energy to a dart with a mass of 0.05 kg, What is the dart's speed
calculate w for the following reactions that occur at 298k and 1 atm pressure, CO2(g) + NaOH(s) -> NaHCO3(s) and 3O2(g) -> 2O3(g)
Two metal conductors that are separated by a distance of 0.89 mm. When an electric spark jumps between them, What is the magnitude of the potential difference
What are the major products formed upon treatment of (E) 3-methyl-2-hexene with HBr in the absence of peroxides?
A point charge q = ?2.3 nC is initially at rest adjacent to the negative plate of a capacitor, What is the potential difference between the plates
For [Co(en)(NH3)2Cl2]ClO4 identify the coordination number of cobalt, the coordination geometry for cobalt, the oxidation number of cobalt, the number of unpaired electrons
Dizziness. Our balance is maintained, at least in part, by the endolymph fluid in the inner ear. Spinning displaces this fluid, causing dizziness, What is the radical acceleration (in m/s^2) of the
In which of the following complexes are geometric isomers possible, [Co(H2O)4Cl2]+, [Co(NH3)3F3], [Pt(NH3)Br3]-, [Co(en)2(NH3)Cl]2+, if isomers are possible draw their structures and label them as c
C double bond O x2 for the first reaction and in the second reaction the CO has a tripple bond i've tried to do this several times and have gotten 166.5 kj/mol 81kj/mol and 48.5 kj/mol and all of th
Three charges are fixed in the x-y plane as follows: 1.4nC at the origin (0, 0); 2.4nC at (0.90m , 0); -2.1nC nC at (0, 1.25m)
An emerald gemstone is an impure form of the mineral beryl, Be3Al2Si16O18. What is the percentage of silicon in the mineral
What is the molarity if pH at the stoichiometric point is 8 and the volume of base needed is twice the volume of acid being titrated? What is the molarity of the base
the density of the fuel is 0.78 g/mL the initial temperature of the water is 25 degrees celcius and the standard enthalpy of formation is -224.4 kJ/mol
The potential at location A is 478 V. A positively charged particle is released there from rest and arrives at location B with a speed vB, Find the potential at B
An aluminum bar has a length of 2.0 m and transverse dimensions of 3.5 mm and 6.9 mm, What force is required to stretch the bar 1.2 mm
A buffer contains 0.19 mol of propionic acid (C2H5COOH) and 0.22 mol of sodium propionate (C2H5COONA) in 1.20L. What is the pH of the buffer after the addition of 0.02 mol of HI
How many grams of sodium benzoate should be added to prepare the buffer? Neglect the small volume change that occurs when the sodium benzoate is added
An electron beam is deflected upward through 3.23 mm while traveling in a vacuum between two deflection plates 11.6 mm apart, What is the kinetic energy of each electron when it leaves the space betwe
A lactic acid/lactate ion buffer solution contains 0.29 M hc3h5o3 and 0.80 M C3H5O3-, respectively. The Ka value of lactic acid is 1.4X10^-4. Calculate the pH of this buffer.
Consider an insulated enclosed volume of 27m^3 containing dry air at 23 degrees celsisus and 980mb, What is the specific volume and mass of the air sample
A 613-mL sample of unknown HCl solution reacts completely with Na2CO3 to form 11.1g CO2 . What was the concentration of the HCl solution
The additive was a compound containing carbon, hydrogen and lead (Pb). When 51.36 g of this compound was burned in excess oxygen, 55.90 g of CO2 and 28.61 g of H2O were produced. Determine the empir