The bond enthalpy value for a carbon to hydrogen bond is 413 kj. what does this mean? a. it takes 413 kj of energy to break a carbon to hydrogen bond. b. the formation of a carbon to hydrogen bond releases 413 kj of energy. c. both of the above

At 20∘c, the hole in an aluminum ring is 2.800 cm in diameter. you need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm . 1. to what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? coefficients of linear thermal expansion of steel and aluminum are 12×10−6 k−1 and23×10−6 k−1 respectively.

You notice the birds sitting on the electrical wires which of the following explain why the birds don't get shocked

Use vsepr theory to predict the molecular geometry of the molecule hcn.