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Calculate the pH at the points in the titration of 40.00 mL of 0.425 M NH3 for the reaction below. NH3(aq) + HNO3 -> NH4+(aq) + NO3(aq) For NH3, Kb = 1.8x10-5. Enter your answer with 2 decimal pl
A 1792 kg safe is 3.01 m above a heavy-duty spring when the rope holding the safe breaks. What is the spring constant of the spring
Enter scientific notation as 1.23E4. (a) When 11.50 mL of 0.470 M HNO3 have been added. (b) When 65.00 mL of 0.470 M HNO3 have been added
Four identical springs are used as part of a car's suspension system, one on each wheel. What will be the frequency at which the car will bounce
Draw the Lewis structures for each of the following molecules or ions. Which do not obey the octet rule? (a) NO, (b) BF3, (c) , (d) OPBr3 (the P is the central atom), (e) XeF4
A spinning flywheel has rotational inertia I = 401.0 kg · m2. Its angular velocity decreases from 20.4 rad/s to zero in 261.6 s due to friction
What is the mole fraction of NaCl in this solution. what would be the vapor pressure of this solution at 45C? The vapor presssure of pure water is 23.8 torr at 25C and 71.9 torr at 45C
The nucleus of radioactive polonium-210, with a mass of about 3.49?10?25kg , is known to decay by emitting an alpha particle with a mass of about 6.68?10?27kg. what is the recoil speed of the remain
Determine the molarity of each of the following. be sure to show the setups by which you get the answers. Na+ and SO3(2-) in .647 M Na2SO3 Ca2+ and SO4 (2-) in .035 M CaSO4
A 27.4 kg runaway grocery cart runs into a spring with spring constant 387 N/m and compresses it by 75.5 cm. What was the speed of the cart just before it hit the spring
A 8.05-L container holds a mixture of two gases at 39 degree Celsius. The partial pressure of gas A and gas B, respectively, are 0.178 atm and 0.894 atm. If 0.210 mol a third gas is added with no ch
1) What would be produced if water was used instead of methanol for the transesterification (fats/oils with strong alkali solution) 2) How does burning biodiesel produce no net CO2 in the atmosphere
A 70 kg crate is pushed at constant speed up the frictionless 35° ramp shown in the figure. What horizontal force F is required? What force is exerted by the ramp on the crate
A scientist wants to make a solution of tribasic sodium phosphate, , for a laboratory experiment. How many grams of will be needed to produce 250 of a solution that has a concentration of ions of 0.
A toy car with a mass of 120 g moves to the right with a speed of 0.43 m/s. What is the change in speed of the car
600g model rocket is on a cart that is rolling to the right at a speed of 4.5m/s. At what horizontal distance left of the loop should you launch
If each of the following gas samples have the same temperature and pressure, which sample has the greatest volume? A) 1 gram of O2 B) 1 gram of Ar C) 1 gram of H2 D) all have the same volume E) not
Suppose you prepared benzil by the oxidation of benzoin, describe how you could use TLC (thin layer chromatography) to decide when the reaction is complete.
An insect 4.00mm tall is placed 20.0cm to the left of a thin planoconvex lens. Calculate the location of the image this lens forms of the insect
Complete the equations that illustrate bicarbonate ion's capability to function as a buffer. a) HCO3^-1 + H+ --> ? b) HCO3^-1 + OH- -->
The average density of the planet Venus is 5219 kg/m3. The acceleration of gravity on its surface is 8.84 m/s2. Calculate the average radius of Venus
A proton (mass 1.67 × 10 ?27kg) is moving at 1.15 ×10 ?6m/s directly toward a stationary helium nucleus (mass 6.64 × 10 ?27kg). After a head-on elastic collision, what is the helium'
A speck of dirt is embedded 3.00cm below the surface of a sheet of ice having a refractive index of 1.309. What is the apparent depth of the speck
One of the limitations on the design of modern windmills for the generation of electricity is that the tip of the blades must not exceed the speed of sound in air, What is the acceleration of the bl
A student sits on a rotating stool holding two 3.5 kg objects. When his arms are extended horizontally, Find the kinetic energy of the student before and after the objects are pulled in