8111

Chemistry Organic Chemistry Level: Misc Level

Indicate the mechanism for each reaction using the designation Sn1 or Sn2 above each arrow.


8110

Physics Heat & Thermodynamics Level: Misc Level

Calculate the amount of energy required to heat 21.7 g of water from 18.2 degrees Celcius to 39.7 degrees celcius.Then calculate the amount of energy required to heat 21.7 g of iron from 18.2 degrees Celcius to 39.7 degrees celcius. Does heating the iron take more or less energy than heating the same mass of water?


8109

Chemistry Inorganic Chemistry Level: Misc Level

What volume of 1.024 M H2SO4 is required for a complete reaction with 100.0ml of 0.8845 M NaOH??(acid base reaction produces salt and water)


8108

Chemistry Inorganic Chemistry Level: Misc Level

When ammonium dichromate is heated, it decompeses to nirtogen gas, chromium oxide, and water.How many g of water will be produced when 1.0 g of ammonium dichromate is heated?


8107

Chemistry Organic Chemistry Level: Misc Level

Wine turns into vinegar when the ethanol in the wine C2H5OH reacts with oxygen to form acetic acid CH3COOH.suppose 1.12g of oxygen were sealed in a wine bottle that contains 2.28 g of ethanol. which reactnt is limiting, oxygen or ethanol?What would he the theoretical yeild of acetic acid produced?


8106

Chemistry Organic Chemistry Level: Misc Level

What mass of ethylene glycol (C2H6O2), the main component of antifreeze, must be added to 10.0 L water to produce a soltion for use in a car,s radiator that freezes at-23.3oC? Assume the density for water to be exactly 1g/mL.


8104

Mathematics Transformations Level: Misc Level

What point do we get by rotating the (x,y) around the origin clockwise through 90 deg? give coordinates of the new point in terms of x and y.


8100

Physics Force & Laws Of Motion Level: Misc Level

A short 10 gram string is used to pull a 50 gram toy across a frictionless horizontal surface. If a 3.0 x10 Newton force is applied horizontally to the free end.Find the force of the string on the toy,at the other end.


8099

Physics Force & Laws Of Motion Level: Misc Level

A rocket exhausts fuel with a velocityy of 1500 m/s, relative to the rocket.It starts rest in outer space with feul comprising 80% of the totoal mass.Find its speed in all the fuel has been exhausted.


8097

Physics Force & Laws Of Motion Level: Misc Level

A stone of m=0.8 kg is projected across a sheet of ice with an initial speed of 2.40 m^-1.The coefficient of sliding friction between the stone and the ice is 0.0250.How far will the stone travel before it comes to rest?Take g=9.81 ms^-2.


8096

Physics Collisions Level: Misc Level

A bullet of mass 100 g is fired horizontally into a 14.9 kg block of wood resting on a horizontal surface, with the bullet becoming embedded in the block.If the muzzle velocity of the bullet is 250 m/s, what is the velocity of the block containing the bullet immediately after the collision? If the coefficient of friction between the block and the surface is 0.60, how far will the block slide before coming to rest?


8095

Physics Force & Laws Of Motion Level: Misc Level

Two masses are suspended from a frictionless pulley as shown. The pulley itself has a mass of 10-kg and its radius r=10 cm.(a) What is the magnitude of the acceleration of the suspended masses if m1=12 kg,and m2=8 kg? (b) What are the tensions in the string? (Neglect the mass of the string.)


8094

Physics Force & Laws Of Motion Level: Misc Level

A child whose weight is 287 N slides down a 6.6 m playground slide that makes an angle of 41% with the horizontal.The coefficient of kinetic friction between slide and child is 0.086.(a) How much energy is transferred to thermal energy? (b) If she starts at the top with a speed of 0.568 m/s, what is her speed at the bottom?


8093

Physics Collisions Level: Misc Level

A bullet of mass 100 g is fired horizontally into a 14.9 kg block of wood resting on a horizontal surface, with the bullet becoming embedded in the block.If the muzzle velocity of the bullet is 250 m/s, what is the velocity of the block containing the bullet immediately after the collision? If the coefficient of friction between the block and the surface is 0.60, how far will the block slide before coming to rest?


8092

Physics Force & Laws Of Motion Level: Misc Level

A child whose weight is 287 N slides down a 6.6 m playground slide that makes an angle of 41% with the horizontal.The coefficient of kinetic friction between slide and child is 0.086.(a) How much energy is transferred to thermal energy? (b)If she starts at the top with a speed of 0.568 m/s, what is her speed at the bottom?


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