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A car is traveling at 28 m/s when the driver spots a large pothole in the road a distance 25 m ahead. She immediately applies her brakes. If her acceleration is -6.9 m/s2, does she manage to stop be
How do you calculate the mass of magnesium that is required to produce 35.8ml of hydrogen gas at 28°c and a barometric pressure of 745 mmHg when collected over water?
How much rations must the hiker consume to avoid a reduction in body temperature of 4.0 K as a result of heat loss? Assume the heat capacity of the body equals that of water. Assume the
What is the mole fraction of ethanol in a solution made by dissolving 14.6 g of ethanol in 53.6 g of water?
A nuclear power plant operating at 40.0% efficiency produces 1072 MW of usable power. What is the energy in joules released by the fission of a single uranium-235 atom?
Thomas poured 25 mL of 0.60 M HCl into a large bottle. He then added enough water so that the new (diluted) concentration was 0.10 M HCl. How much water did Thomas add?
How many molecules of carbon dioxide are produced when 130 molecules of acetylene (HCCH) to react in excess oxygen produce carbon dioxide and water
A frictionless pulley with zero mass is attached to the ceiling, in a gravity field of 9.80 m/s2. Mass M2=0.100 kg is being accelerated downward with a=1.10 m/s2. Calculate the mass m1
The half-life of C-14 is 5730 years. A 3.4 g sample of bone has 33.3 disintegrations per minute. How old is the bone sample in years?
Calculate the enthalpy change associated with the conversion of 25.0 grams of ice at -4.00°C to water vapor at 110.0°C.
If the volume of a container is 69.4 L. and the container holds a gas at 23.2 oC. and 7.00x104 mmHg. The density of the gas is 16.88 g/L.
Phenyl-methane-sulfonyl-fluoride (PMSF) inactivates serine proteases by binding covalently to the catalytic serine residue at the active site; this enzyme-inhibitor bond is not cleaved by the enzyme
An under damped harmonic oscillation has its amplitude reduced to 1/10thof its initial value after 100 oscillations. If its time period is 1.15s then calculate (i)damping constant (ii) relaxation ti
A sample contains BaCl2.2H2O and NaCl. After 0.678 g of sample was heated and residue weighted 0.648 g. What is the percent of BaCl2.2H2O in the sample?
Buffer capacity = moles of H+ or OH consumed/ change in ph x volume of buffer solution. Okay how do I find the moles of H+ or OH consumed?
0.780 g of aluminum sulfate was mixed with 0.400 g of barium chloride. A white precipitate barium sulfate was formed.
If you take a 10.5mL portion of the stock solution and dilute it to a total volume of 0.350 L, what will be the concentration of the final solution?
A tank having a volume of 0.100 m3 contains helium gas at 125 atm. How many balloons can the tank blow up if each filled balloon is a sphere 0.300 m in diameter at an absolute pressure of 1.10 atm?
Calculate the enthalpy change (H) of the reaction for per mole patassium carbonate. Assume the specific heat of all solutions are 4.18 J/g.oC and all solutions have a density =1.0 g/mL.(10.2kJ/mol)
A chair of weight 85.0 N lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of F = 36.0 N directed at an angle of 39.0 degrees below the horizontal and
Minimum energy needed to eject an electron from a sodium atom is 4.41 x 10(-19) j. what is the maximum wavelength of light, in nonometers that will cause this effect with sodium?
When 4.0 mL of concentrated NaK solution is diluted into 100.0 ml, the final concentration is 0.056 M, what is the initial concentration?
One of the fastest recorded pitches in major-league baseball,thrown by Billy Wagner in 2003, was clocked at 101.0 mi/h. If a pitch were thrown horizontally with this velocity, how far would the ball
A sample contains BaCl2.2H2O and NaCl. The total mass of the sample is 1.500g. After the sample was heated, the residue weighs 1.353 g.