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Calculate the standard enthalpy of formation of solid diboron trioxide (B2O3) using the following thermochemical information
When you touch a friend after walking across a rug on a dry day, you typically draw a spark of about 2 mm. Estimate the potential diference between you and your friend before the spark
What are the steps to determine isotope fractionation between water and vapor at 25 degrees C
Two point charges of magnitude 3.02 nC and ?1.82 nC are separated by 41.4 cm. What is the potential energy of the pair of charges
Calculate the change in heat when 17.25 g of water vapor (steam) at 100.0 degrees C condenses to liquid water and then cools to 10.00 degrees C
Write the balanced complete ionic equations and net ionic equations for the reactions that occur when each of the following solutions are mixed. AgNO3(aq) and K2SO4(aq)
Draw the structure of the one alkene which upon treatment with O2 followed by Zn and acid, would give rise to formaldehyde and cyclohexanone
Some wastewater has a BOD5 of 150 mg/L at 20 degrees Centigrade. The reaction rate k at that temperature has been determined to be 0.23/day.
What is the isotopic difference (in per mil) at 25degrees between gas, liquid, and solid phase for the elements carbon and sulfur. Show calculations
Pool players often pride themselves on their ability to impart a large speed on a pool ball. At what speed did his pool ball hit the ground
A 0.180kg block of ice is placed against a horizontal, compressed spring mounted on a horizontal tabletop that is 1.40m above the floor. what is the speed of the block of ice when it reaches the floo
Write the balanced complete ionic equations and net ionic equations for the reactions that occur when each of the following solutions are mixed. (NH4)3PO4(aq) and CaCl2(aq)
A point charge Q is located at the center of a very thin, spherical metal shell. what is the electric potential of the shell
Calculate ?G at 25 ºC for a reaction in which Ca2+(aq) combines with CO32-(aq) to form a precipitate of CaCO3(s) if the concentrations of Ca2+(aq) and CO32-(aq) are 0.023 M and 0.13 M, respecti
Compare the magnitudes of the gravitational force of attraction and the electric force of attraction between the electron, Find the ratio of the electric force to the gravitational force
Order the following compounds according to their expected lattice energies: LiBr, LiCl, LiI, KI, NaI, Express your answers as chemical formulas. decreasing expected lattice energy separated by commas.
A barge is hauled along a straight-line section of canal by two horses harnessed to tow ropes and walking along the tow paths on either side of the canal. What is the net force on the barge
A 18.0L gas cylinder is filled with 5.20moles of gas. The tank is stored at 29 degrees C . What is the pressure in the tank
A catapult launches a test rocket vertically upward from a well, giving the rocket an initial speed of 80.8 m/s at ground level. What is its maximum altitude
How much water would I need to add to 500mL of 2.4 M KCl solution to make a 1.0 M solution?
Two metal spheres, each of mass 20 g and initially at rest, are dropped from a height of 9 m in an evacuated chamber. Find the difference in final speeds of the two spheres
A balloon is floating around outside your window. The temperature outside is 1\, ^{\circ}C , and the air pressure is 0.700atm . Your neighbor, who released the balloon, tells you that he filled it w
The specific heat of a certain type of metal is 0.128 J/(g x C). What is the final temperature is 305 J of heat is added to 63.8 g of this metal initially at 20.0 C
Calculate Earth's average speed relative to the Sun (in m/s). According to my book, the answer is 3.0x10^4 m/s