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A man driving a car toward a large vertical wall sounds his horn. The car is traveling at 81 km/h. What is the frequency of the cars horn
Calculate the pH of the solution formed by the addition of 55.5 mL of 0.100 M NaOH to 49.2 mL of 0.100 M H3PO4.
The howler monkey is the loudest land animal and can be heard up to a distance of 1.3km. determine The acoustic power emitted by the howler
Calculate the potential of a hydrogen ( p= 1.02 atm) electrode in an aqueous solution of HBr (0.05 m ) at 298 K A) assuming ideal solute behavior. B) using the Deby- Huckel equation.
Which one of the following salts, when dissolved in water, produces the solution with the highest pH. and WHY. KCl, KF, KI, KBr
A voltaic cell consists of a standard H2 electrode in one half-cell and a Cu/Cu2+ half-cell. Calculate [Cu2+] when Ecell is 0.25 V
The rate constant of the reaction: a. Depends on the concentration of reactants b. Describes the rate of the reaction when it reaches equilibrium c. Is a thermodynamic constant that is always true f
A farsighted person has a near point of 60.0 cm for the left ye and a near point of 90.0 cm for the right eye. What power should contact lenses have to allow the person
An astronomical telescope uses an eyepiece of power +100.0 D. what are the power of the objective and the magnifcation of the telescope
A student adds 33.0045g of potassium acetate to water and then adds 7.0 ml of 1.0 M HCl to this . the resulting solution is diluted to 250.0 ml calculate the PH of the resulting solution.
to combat wasteful habits we often speak of "conserving engery", by which we mean turning off lights, find the difference in energy conservation and conserving energy
The decomposition of ammonia is 2NH3(g) = N2(g) + 3H2(g). If Kp is 1.5x10^3 at 400 degrees C, what is the partial pressure of ammonia at equilibrium when N2 is 0.10 atm and H2 is 0.15 atm
A circuit consists of two 475-k%u03A9 resistors in series with an ideal 12.0-V battery. Calculate the potential drop across one of the resistors
Net ionic equation for 2CH3COOH(aq)+ Sr(OH)2(aq)----> Sr(CH3COO)2(aq)+2H2O(l) Here's the hint the question came with: (hopefully this means something to you) - what are the two products of a neu
A string %uFB01xed %uFB01xed at both ends is 1 m long. It resonates in its second harmonic at a frequency of 55 Hz. What is the speed of transverse waves on the string
Pure tungsten melts at 3370 C . The liquid has a vapor pressure of 5 torr at 4337 C and of 60 torr at 5007 C calculate the normal boiling point of tungsten.
A violin string that is 57.8 cm long has a fundamental frequency of 350 Hz. What is the speed of the waves on this string
The result described is impossible, given the fact that delta G is -60 kJ/mol. d. The activation energy for the reaction is very large; equilibrium has not been reached by 24 hours. e. An enzyme has
A block of unknown mass is attached to a spring of spring constant 7.9 N/m and undergoes simple harmonic motion with an amplitude of 13.2 cm. Calculate the mass of the block
A 0.377 kg mass is attached to a spring and undergoes simple harmonic motion with a period of 0.57 s. The total energy of the system is 3 J
A 45.3 g mass is attached to a horizontal spring with a spring constant of 14 N/m and released from rest with an amplitude of 37.2 cm. What is the velocity of the mass
When a mass of 25 g is attached to a certain spring, it makes 19 complete vibrations in 4.5 s. What is the spring constant of the spring
The equilibrium contant Kc for the reaction HF(aq)+H20(l)-->H30+(aq)+F-(aq) is 3.5x10^-4. What is the equilibrium concentraction of H30+ if the initial concentration of HF is 1.0M
Determine the acid dissociation contant for a 0.10M acetic acid solution that has a pH of 2.87. Acetic acid is weak monoprotic acid.
Whats the reduced mass of CO2. I know how to do it for CO but since its 3 molecules do you go m1+m2+m3/m1m2m3 or is m2 just 32