The orange material that coats the base of this stream is ferric hydroxide (Fe(OH)3). It is characteristic of streams in areas polluted by acid mine drainage where oxygen-rich water comes in contact with pyrite-rich (FeS2) coal. The reaction responsible for the creation of this iron compound is an example of which of the following? A. hydration B. hydrolysis C. oxidation D. dissolution

What is the length x of the side of the triangle below? (hint: use the cosine function)

A30 kg weight lies on top of a massless piston of area a = 0.01 m2 the exterior air is at a (constant) p =1 atm and t = 27 c. the interior gas is 0.4 moles of (ideal) n2 and it has initial temperature 27.00 degrees c. 1. what is the initial pressure in the interior? a. 29.4 kpa b. 130.7 kpa c. 101.3 kpa the next three questions concern what happens when an amount of heat q is slowly added to the interior, raising the piston by 1 mm and raising the interior temperature to 27.40 c

Amodel rocket with a mass of 0.212 kg is launched into the air with an initial speed of 84 m/s. how much kinetic energy will the rocket have at a height of 214 m? assume there is no wind resistance. 634 j 303 j