Based on relative bond strengths, classify these reactions as endothermic (energy absorbed) or exothermic (energy released):

endothermic
b2+c2--> 2bc
a+bc--> ab+c

exothermic
ab+c--> ac+b
a2+c2--> 2ac
a2+b2--> 2ab

Identify the theory that can be used to explain each phenomenon. answers diffraction: wave theory interference: wave theory reflection: both particle and wave theories refraction: both particle and wave theories

Aturntable a is built into a stage for use in a theatrical production. it is observed during a rehearsal that a trunk b starts to slide on the turntable 10 s after the turntable begins to rotate. knowing that the trunk undergoes a constant tangential acceleration of 0.31 m/s2, determine the coefficient of static friction between the trunk and the turntable.

Which subatomic particle has a negative charge