Which of the following is an example of kinetic energy? a book sitting on a library shelf

b. a soccer ball rolling across the field

C. a coat hanging in the closet

d. a train stopped at the station

All motion is caused by force? true or false

Given the following at 25c calculate delta hf for hcn (g) at 25c. 2nh3 (g) +3o2 (g) + 2ch4 (g) > 2hcn (g) + 6h2o (g) delta h rxn= -870.8 kj. delta hf=-80.3 kj/mol for nh3 (g), -74.6 kj/mol for ch4, and -241.8 kj/mol for h2o (g)

Analyze the reaction to determine whether the reaction is exothermic or endothermic. explain your reasoning.