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The starter motor of a car engine draws a current of 160A from the battery. The copper wire to the motor is 4.80mm in diameter and 1.2 m long. How much charge passes through the starter motor
Which solution should be the most acidic? 1) Zn(NO3)2(aq) 2) Cd(NO3)2(aq) 3) Ga(NO3)3 (aq) 4) Hg(NO3)2(aq) 5) Al(NO3)3(aq)
A rotating wheel requires 2.99-s to rotate through 37.0 revolutions. What is the constant angular acceleration of the wheel
The thermochemical equation for the burning of ethyl alcohol is C2H5OH(l) + 3O2(g) --> 2CO2(g) + 3H2O(l) ?H = -1,367 kJ What is the enthalpy change (in kJ) for burning 9.68 g of ethyl alcohol
The current in an electric hair dryer is 12A. How many electrons flow through the hair dryer in 5.2 min
Why do extremely dilute charged particles in an electric field move slower in an aqueous solution that contains other ions at much higher concentration in colution compare to the same particles in t
In an integrated circuit, the current density in a 3.0??m?thick× 80 ??m?wide gold film is 7.9×105A/m2. How much charge flows through the film in 15 min
Use the Henderson-Hasselbalch equation to calculate the pH of each solution: a solution that is 0.140 in propanoic acid and 0.125 in potassium propanoate.
The electric field component of a sinusoidal electromagnetic wave traveling through a plastic cylinder is given by the equation E = (5.35(V/m))cos[(1.39x10^7 (rad/m))x-(3.02x10^15(rad/s))t]
what is/are the organic product(s) in the reaction below. draw a stepwise, detailed mechanism for the following reaction. a.) CH3C=C-CH3 + Br2
1.00 ×1020electrons flow through a cross section of a 3.90?mm?diameter iron wire in 4.50s . The electron density of iron is n =8.5×1028m?3
Explain why viruses, in physiologic conditions, are capable of packing extremely large amounts of DNA (negatively charged) into their tiny capsids.
Devise a synthesis of the ketone 3-hexanone, CH3CH2COCH2CH2CH3, from CH3CH2Br as the only organic starting material; that is, all the carbon atoms in 3-hexanone must come from CH3CH2Br
Calculate the H3O+ concentration and the PH for the following: a) a solution with OH- concentration= 4.5*10^-4 M? b) a solution with a pH of 5.6
Jack and Jill are standing on a crate at rest on the frictionless, horizontal surface of a frozen pond. Jack has a mass of 74.5kg , What is the final speed of the crate if Jill jumps first and then J
A.) If 75.0 g of sodium is mixed with 40.0 g of nitrogen gas, what mass of sodium nitride forms? B.) If the reaction in part A has a percent yield of 90 % , how much sodium nitride is actually produ
How many liters of H2 gas, measured at 752mm Hg and 85 degrees C, are required to synthesize 0.65mol of CH3OH? How Many liters of CO gas, measured under the same conditions are required? CO(g)+2H(g)
What is the pH of a buffer solution that is 0.255 M in lactic acid and 0.333 M in sodium lactate? The Ka of lactic acid is 1.4 × 10-4.
A solid, uniform ball rolls without slipping up a hill, How far from the foot of the cliff does the ball land
A vacuum cleaner belt is looped over a shaft of radius 0.44cm and a wheel of radius 1.50cm. What is the speed of a point on the belt
If the x-component of the velocity of an electron can be measured only to a precision of , what is the minimum uncertainty of the position of the electron in the x-direction. ( )
A person whose near-point distance is 52cm wears a pair of glasses that are 2.2cm from her eyes. Find the refractive power of her glasses
How many liters of hydrogen gas are formed from the complete reaction of 1.06mol of C? Assume that the hydrogen gas is collected at a pressure of 1.0 atm and temperature of 325K? Using C(s)+H2O(g)=C
For 0.51 M HCN (Ka=6.2 x 10-10), mark the major species found in the solution. H+ , HCN , CN-, H2O , OH, Now calculate the pH of the 0.51 M HCN solution (Ka= 6.2 x 10-10).
Acetylene gas, , burns in oxygen to produce carbon dioxide and water. If 60.4 g of CO2 are produced when 22.62 c2h2 react with sufficient oxygen, what is the percent yield for the reaction