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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
Two carts are involved in an elastic collision. The dynamics cart A with mass 0.550 kg hits the collision cart B with mass 0.550 kg (initially at rest). What is the final kinetic energy of the syste
Consider the reaction of sulfur dioxide and water, which is represented by the following equation: 2SO2(g) + 2H2O(g) ® 2H2S(g) + 3O2(g) How many moles of electrons are transferred according to t
One solenoid is centered inside another. The outer one has a length of 46.0cm and contains 6600 coils, Find the emf induced in the inner solenoid
Why are the bond angles of methane, ammonia, and water different for each even though the electron domain geometry is the same for each
The centers of a 12kg lead ball and a 100g lead ball are separated by 6.0cm. What gravitational force does each exert on the other
An aqueous solution containing 5.77 g of an optically pure compound was diluted to 500.0 mL with water and placed in a polarimeter tube 20.0 cm long. The measured rotation was -3.95° at 25 °
It is possible to make a barometer using a liquid other than mercury. What would be the height (in meters) of a column of water at a pressure of 0.390 atm, given that 0.390 atm is equal to a 0.296 m
A 450 gram ball of copper at 20.0 degree C is placed in a pot of boiling water until equilibrium is reached. How much thermal energy is absorbed by the ball
A circus clown wiwith a mass 54 kg is launched vertically from a springloaded cannon using a spring with a spring constant of 3.5*10^3 N/m. What is maximum speed of clown
indicate the direction of the bond polarity of NH3 and CH4. are either of the molecules polar. is ClH3 polar. why or why not.
A hunter on a frozen, essentially frictionless pond uses a rifle that shoots 4.20g bullets at 960m/s. Find the recoil velocity of the hunter if he fires the rifle horizontally
Draw the MO diagram for S2 and indicate all atomic and molecular orbitals for both core and valence electrons.
The first dissociation constant for carbonic acid (H2CO3) is K1 = 4.45e-7. Assume all activity coefficients are equal to 1.0. What is the concentration of carbonic acid in a) moles/liter, b) mg/l as
Calculate an approximate delta_h in kilojoules for the industrial synthesis of ethyl alcohol from ethylene: C2H4(g) + H2O(g) -> C2H5OH
Identify the change in state that does not have an increase in entropy. Identify the change in state that does not have an increase in entropy. Water freezing Dry ice subliming Water evaporating Ice
If the boiling point of the pure of (S)-(-)-alpa-phenylethylamine is 186-188 degrees Celsius, what is the bp of its enantiomer. What optical rotation would be observed if 3.72 g of (S)-amine were mi
Dopa (Levodopa) is an oral medication used to treat Parkinson\'s disease, the symptoms of which result from a lack of dopamine in the brain. L-Dopa relies on L-type, or leucine-preferring, transport