Energy enables an object to do work. work is done when a. a force is put on an object, but the object does not move in any direction. b. no force is put on an object, and the object does not move in any direction. c. no force is put on an object, but the object moves at varying speeds in a random direction. d. a force is put on an object, and the object moves in the direction of the force.

Phosphoric acid is a triprotic acid ( =6.9×10−3 , =6.2×10−8 , and =4.8×10−13 ). to find the ph of a buffer composed of h2po−4(aq) and hpo2−4(aq) , which p value should be used in the henderson–hasselbalch equation? p k a1 = 2.16 p k a2 = 7.21 p k a3 = 12.32 calculate the ph of a buffer solution obtained by dissolving 18.0 18.0 g of kh2po4(s) kh 2 po 4 ( s ) and 33.0 33.0 g of na2hpo4(s) na 2 hpo 4 ( s ) in water and then diluting to 1.00 l.

Describe at least two advantages and two disadvantages of using hydropower as a source of energy.

Use the half-reactions of the reaction au(oh)3 + hi -> au +i2 +h2o to answer the questions