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In writing the chemical formula of a compound such as Al2O3, the following statement is a true relationship between the Al and O atoms
How much voltage is required to cause possible heart fibrillation in a man, which corresponds to 490 mA of direct current?
Based on the pKa of benzoic acid and the pKa of HCl, what do you hypothesize will happen in terms of reaction equilibrium. The equilibrium will favor the starting materials (sodium benzoate and HCl) b
Josh starts his sled at the top of a 3.3m -high hill that has a constant slope of 25 ^\circ. How far from the base of the hill does he end up
A runner covers one lap of a circular track 40.0m in diameter in 63.3s. what were her average velocity(in m/s) for that half-lap
Suggest a synthesis for the following alcohol starting from an aldehyde or ketone and propylmagnesium bromide
It's 37 by road from town to a ski resort, What's the road's average inclination angle
A 75-kg piece of metal has specific heat 430 J/kg°C and is initially at 950°C. To cool it down, it is dunked into 710 kg of oil that has a temperature of 32°C and specific heat of 27
Arrange the following in order of increasing basicity: a) ch3nh2, ch3nh3+, ch3nh- b) ch2o-, ch3nh-, ch3ch2- c) ch2ch(triple-bond)ch-, ch3ch2ch2-, ch3c(trip-bond)c-
A positive charge +q1 is located to the left of a negative charge ?q2. On a line passing through the two charges, What is the distance between the charges
A car owner forgets to turn off the headlights of his car while it is parked in his garage. how long will it take the battery to completely discharge
Describe in words how you would go about calculating the work done by the electric field on the electron as it travels along its trajectory.
In order to measure the radial velocity of a star (the speed of motion towards or away from us) what type of instrument would be used and how would the data be used to derive the velocity?
The force of attraction between a -20.0 ?C and +80.0 ?C charge is 4.00 N, What is the separation between these two charges
Two identical metallic blocks resting on a frictionless horizontal surface are connected by a light metallic spring having a spring constant k as shown in the figure and an unstretched length Li
A charge q = +929 ?C is uniformly distributed on a thin nonconducting ring of mass m = 0.60 g and radius r = 2.60 cm. What is the final angular velocity of the ring
Pretend you run a reaction and your theoretical yield is 5.25 grams, but you isolate 5.50 grams. What is the most likely reason for the excess weight
The hypotenuse of a right triangle measures 11.5. what are the lengths of the other two sides
A dockworker applies a constant horizontal force of 85.0N to a block of ice on a smooth horizontal floor. The frictional force is negligible. What is the mass of the block of ice
A heat engine with 0.500mol of a monatomic ideal gas initially fills a 1000cm^3 cylinder at 700K. How much work does this engine do per cycle
The following molecular equation represents the reaction that occurs when aqueous solutions of silver nitrate and calcium iodide are combined. 2 AgNO3(aq) + CaI2(aq) 2 AgI(s) + Ca(NO3)2(aq) Write th
She titrated the acid with a NaOH solution whose exact concentration was unknown. A volume of 18.19 mL of NaOH solution was required to reach the endpoint of the titration. What was the concentratio
Write the net ionic equation for the precipitation of chromium(III) hydroxide from aqueous solution
You are practicing throwing darts in your dorm. You stand 2.89 m from the wall on which the board hangs. Calculate the speed of the dart when it hits the board
An aqueous solution containing 5.85g of an optically pure compound was diluted to 800.0mL with water and placed in a polarimeter tube 10.0cm long. The measured rotation was -5.93degrees at 25degrees