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A spacecraft descends vertically near the surface of Planet X. An upward thrust of 25.0 kn from its engines slows it down at a rate of 1.20 m/S2, but it speeds up at a rate of 0.80 m/S2 with an upwa
104.2mg CaCO3 was found through a gravimetric analysis experiment from a 0.2653g portion of a 1.5219g tablet. What is the mass of CaCO3 in the complete tablet?
What is the heat of sublimation (kcal/mol) of I2 at 298.15 K? (the heat of formation of iodine gas is 62.25 kJ/mol)
If the same volume of the buffer was 0.330 M in HF and 0.330 M in NaF, what mass of NaOH could be handled before the pH rises above 4.00?
Show that the minimum stopping distance for and automobile traveling at speed v is equal to v2/2µsg, where µs is the coefficient of static friction between the tires and the road, and g
An isotope of the element Thallium, Tl-206, undergoes beta decay with a half life of 3.1 minutes. Assume you begin with 1.0 grams of the thallium isotope, what mass of the isotope will be left after
During an Olympic bobsled run, the Jamaican team makes a turn of radius 7.6 m at a speed of 96.6 km/h. What is their acceleration in terms of g?
Show that delta G^degree= delta H^degree - (T)(delta S^degree). Indicate whether the reaction is spontaneous or not.
The most important commercial process for converting N2 from the air into nitrogen-containing compounds is based on the reaction of N2 and H2 to form ammonia (NH3):
An aquarium 2 m long, 1 m wide, and 1 m deep is full of water. Find the work needed to pump half of the water out of the aquarium. (Use the fact that the density of water is 1000 kg/m)
What volume of 0.250 mol/L Ca(CH3COO)3 (calcium acetate) solution should you add to 25.00 mL of 0.500 mol/L CH3COOH to prepare a buffer solution which has a pH of 4. 754?
A baseball diamond is a square with side 90 ft. A batter hits the ball and runs toward first base with a speed of 24 ft/s.
How many moles of iodine will sublime into a 500mL flask at this temperature? If the volume of the flash is doubled at constant temperature, what will happen to the equilibrium vapor pressure of I2?
15 swallows flew 380 miles south to escape the cold. After resting for a day they flew another 800 miles towards the coast. How many miles did each swallow fly? How many did they fly altogether?
The radioisotope argon-41 is used to measure the rate of the flow of gases from smokestacks. It is a γ emitter with a half-life of 109.2 minutes. Calculate the fraction of an argon-41 sample
Substance B is composed of small molecules but boils at -188 degrees celsius. Which substance is more likely a polar molecule?
Calculate the molar mass of benzoic acid in the solution based on the boiling point elevation. (kb for CCl4 is 5.03 C/m)
What would be the pressure of the gas sample if the gas is compressed at a constant tempterature to a volume of 5.44 L?
A 1.00 mol sample of A2 and 1.00 sample of B2 are placed into an evacuated 1.00L container at 500K and allowed to reach equlibrium. At equilibrium concentration of A2 is equal to 0.800M. Calculate
A worker pushes horizontally on a 35 kg crate with a force of magnitude 110 N. The coefficient of static friction between the crate and the floor is 0.37.
By how much will the temperature rise when mg of phenol, C6H5OH (s), is burned in the calorimeter under the same conditions? (ΔcH (C14H10 ,s) = -7061 kJ/mol).
Pittsburgh, Pennsylvania and Miami, Florida lie approx. on the same meridian. Pittsburgh has a latitude of 40.5 degrees North and Miami has latituded of 25.5 degrees North. Find the distance between
The buffer is diluted by adding enough water to make 1.50 L of solution. What is the pH of the diluted buffer?
Question: A ball is tossed so that it bounces off the ground, rises to a height of 1.30 m, and then hits the ground again 1.70 m away from the first bounce. A) How long is the ball in the air betwee
What is the angle of the velocity vector with respect to the ground right after the first bounce?