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Sylvanite is a mineral that contains 28.0% gold by mass. How much sylvanite would you need to dig up to obtain 70.0 g og gold?
A metallic sphere has a charge of +4.7 nC. A negatively charged rod has a charge of -6.0 nC. When the rod touches the sphere, 7.3 109 electrons are transferred. What are the charges of the sphere an
The average rate of consumption of Br- is 1.85×10-4 over the first two minutes. What is the average rate of formation of Br2 during the same time interval?
A student collected hydrogen gas in a buret overwater at 230 C. The buret could not be submergeddeep enough in a water bath to equalize the pressure. The liquid level inside the buret was 14.2 cm ab
A zero-order reaction has a constant rate of 1.60*10-4M/s. if after 40.0s the concentration has dropped to1.00*10-2 M, what is the initial concentration?
Why is it that a solution of sodium dichromate in sulfuric acid is perfect to oxidize a secondary alcohol to a ketone...is it equally good a reagent for the oxidation of a primary alcohol to a aldeh
50.0 mL of water are placed in a calorimeter. When 15.0 g of ice are added to the calorimeter, the temperature drops from 70.0 C to51.2 C. Calculate the heat of fusion of ice in kJ/g, and inkJ/mol
What volume of dry hudrogen would be produced understandard conditions when 0.250 g of magnesium reacts withexcess HCL?
A billiard ball of mas 0.3kg moves with a speed of 5m/s and collides elastically with a ball of mass 0.2kg moving in the opposite direction with a speed of 3m/s. Show that because momentum is conser
Is it possible for the velocity and the acceleration of an object to have opposite signs? If not, state a proof. If so, give an example of such a situation and sketch a velocity vs. time graph to pr
(a) Use the data in Problem 1 to construct a smooth graph of position versus time. (b) By constructing tangents to the x(t) curve, find the instantaneous velocity of the car at several instants. (c)
Two equally charged particles are held 3.2 x 10^3 m apart and then released from rest. The initial acceleration of the first particle is observed to be 7.0 m/s^2 and that of the second to be 9.0 m/s
A large power plant under full load burns about 10000.0 tons of coal a day. How many new power plants would need to be built to meet a projected global energy demand equivalent to 100.0 MB of oil p
A rabbit runs in a straight line with a velocity of +1.4 m/s for a period of time, rests for 12 s, and then runs again along the same line at +0.54 m/s for an unknown amount of time. The rabbit tra
Suppose she drives around a flat curve in the road (radius of curve=25 meters). If her tires are just on the verge of slipping as she drives through the curve, what is her speed?
Why must the equipment for a Grignard reaction be very dry? In some reactions, simply rinsing with acetone prior to the reaction is satisfactory. Why might rinsing with acetone before starting the
How much specific heat must be added or removed(isobarically) to maintain the cabin at 25 degrees Celsius? Consider the air as dry air.
A 2.2 kg object slides down a frictionless track (starting 0.35 m above the ground) to a horizontal surface where it collides elastically with a 0.3 kg mass. 2.8 m later the 0.3 kg mass hits a k=16
Gold forms a substitutional solid solution with silver. Calculate the number of gold atoms per cubic centimeter (in atoms/cm^3) for asilver-gold alloy that contains 18.9 wt% Au and 81.1 wt% Ag.
An elephant has legs that stretch 2.3 from its shoulders to the ground. How much time is required for one leg to swing forward after completing a stride?
What is the SHORTEST distance in meters she must walk (in any direction) to get to a location where there is no sound, due to destructive interference? The velocity of the sound is 350m/s.
The quantity 432 mg of a monoamino monocarboxylic amino acid isobserved to consume 7.39 mEq of acid and base in the titrationrange pH 0.8 to 12.0. What is the name of the amino acid?
Suppose an electron starting from rest is accelerated in a uniform electric field directed horizontally and having a magnitude of 2900 N/C. The electric field covers a region of space 12.5 cm wide.
When a molecule must have a double bond inaccordance with the octet rule, what shape does it have accordingto VSEPR? Or if you can't answer that, does that double bond countas a lone electron pair,
When the rock strikes the styrofoam, it becomes imbedded in the block and causes the block to swing backward. a) Calculate the period of oscillation of the styrofoam as it swings backward.