A chemical reaction occurs when 2 white solids are stirred together. They turn into a slushy, white solid and the glass jar feels really cold. Energy is being by the solids, which means this is an reaction.

A) Released, exothermic
B) Absorbed, endothermic
C) Released, endothermic
D) Absorbed, exothermic

Ahot-air balloon is drifting straight downward with a constant speed of 2.40 m/s. when the balloon is 7.63 m above the ground, the balloonist decides to drop one of the ballast sandbags to the ground below. how much time elapses before the sandbag hits the ground?

Awalk up the phase change graph worksheet

(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present