In a container which can expand or contract (like a balloon), increasing the outside pressure pushing in on a balloon filled with a gas the volume the gas occupies. a. decreases b. has no effect c. increases

For a particular reaction, ? h = -144.6 kj and ? s = -301.2 j/k. calculate ? g for this reaction at 298 k.

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?

Emmy kicks a soccer ball up at an angle of 45° over a level field. she watches the ball's trajectory and notices that it lands, two seconds after being kicked, about 20 m away to the north. assume that air resistance is negligible, and plot the horizontal and vertical components of the ball's velocity as a function of time. consider only the time that the ball is in the air, after being kicked but before landing. take "north" and "up" as the positive ‑ and ‑directions, respectively, and use ≈10 m/s2 for the downward acceleration due to gravity.