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Example on how to make up a buffer: A student has 100 mL of 0.1 M acetic acid and has plenty of 0.1 M sodium acetate and wants to make up a buffer with pH = 5.1.
2 students are titrating and started the titration at 30.0 mL. The buret was at 49.50 mL and the solution still had not chnaged to the base color. They stopped, now at 49.80 mL and refilled the bure
If a solution contains 0.01M Ca^2+, 0.01 M Zn^2+, and 0.01 M Ni^2+ ions and you want to separate them using aqueous (NH4)2C2O2, which ion will precipitate first as an ozalate, CaC2O4, ZnC2O4, or NiC
Planet A and Planet B are in circular orbits around a distant star. Planet A is 4.5 times farther from the star than Planet B. What is the ratio of their speeds
Calculate for the process ?G°, ?H°, ?S°, and DCp at 36.8oC (the ‘°' refers to the reference temperature of 36.8°C). Attach all work and a well labeled van't Hoff plot and e
Comet Halley has an orbital period of about 75 years. Determine the average distance of Comet Halley from the sun in AU
During normal beating, the heart creates a maximum 3.50 mV potential across 0.290 m of a person's chest, What is the wavelength of the electromagnetic wave
Determine the following characteristics of the titration curve for 25.0 mL of 0.400 M NH3(aq) titrated with 0.335 M HI(aq). (For NH3, Kb = 1.8x10-5.)
A lamp is placed 10 cm in front of a concave spherical mirror that forms an image of the filament on a screen placed 3.0 m from the mirror. What is the radius of curvature of the mirror
two converging lenses, each of focal length 15.0 cm, are placed 40cm apart, and object is placed 30cm in front of the first. what is the magnification of the system
In a certain particle accelerator, a current of 0.5 mA is carried by a 5 MeV proton beam that has a radius of 1.5 mm. Find the power consumption of the accelerator
Calculate the wavelength in nm: a) a muon (a subatomic particle with a mass of 1.884 x 10^-25 g) traveling at 345 m/s b) an electron (me = 9.10939 x 10^-28 g) moving at 3.80 x 10^6 m/s in an electro
If a solution contains 0.01 M Ca^2+, 0.01 M Zn^2+, and 0.01M Ni^2+ ions and you want to separate them using aqueous (NH4)2C2O2, which ion will precipitate first as an oxalate, CaC2O4, ZnC2O4, or NiC
A circular conducting loop of radius 11.0 cm is located in a region of homogeneous magnetic field of magnitude 0.300 T pointing perpendicular to the plane of the loop. Calculate the magnitude of the
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 place
The radioactive hydrogen isotope 3H is calledtritium. It has beta-minus decay and a daughter necleus of 3He. What is the time constant for tritium
Projectile is fired with launch angle of 60.0 degrees with a speed of 100.0 m/s at t = 0. (assume no air friction), How far from the launch point does the projectile hit the ground
A projectile is shot from the ground at an angle of 55 degrees with respect to the horizontal, and it lands on the ground 5 seconds later. find the horizontal component of initial velocity
A 2.10 kg mass attached to a spring oscillates with a period of 0.375 s and an amplitude of 20.5 cm. Find the total mechanical energy of the system
A body of mass 2.65 kg moves along the x-axis, and its motion is described by the equation x = 6 sin (13 t + 2), Find the resultant force on the body at t = 0.100 s
A 6-kg bucket of water is being pulled straight up by a string at a constant speed. What is the tension in the rope
A hiker, who weighs 900 N, is strolling through the woods and crosses a small horizontal bridge. What is the magnitude of the force
A long straight horizontal wire located on the equator carries a current. What direction should current be
Two identical clocks are set to 12 noon time when on the ground at rest relative to the ground. What will the moving clock read if the first clock reads 6 p.m.
A string fixed at both ends is 8.98 m long and has a mass of 0.125 kg. What is the longest possible wavelength for a standing wave