1.you have three elements, a, b, and c, with the following electronegativity values:
a = 0.9
b = 3.0
c = 3.5
you react the elements to form the substances ab, ac, and bc. answer the following questions:
•what type of substance is ab? what types of bonds are present? explain your answer.
•what type of substance is ac? what types of bonds are present? explain your answer.
•what type of substance is bc? what types of bonds are present? explain your answer.
•if any of the substances are ionic compounds, which element is the cation and which is the anion? explain your answer.

Two nitro no2 groups are chemically bonded to a patch of surface. they can't move to another location on the surface, but they can rotate (see sketch at right). it turns out that the amount of rotational kinetic energy each no2 group can have is required to be a multiple of ε, where =ε×1.010−24 j. in other words, each no2 group could have ε of rotational kinetic energy, or 2ε, or 3ε, and so forth — but it cannot have just any old amount of rotational kinetic energy. suppose the total rotational kinetic energy in this system is initially known to be 32ε. then, some heat is removed from the system, and the total rotational kinetic energy falls to 18ε. calculate the change in entropy. round your answer to 3 significant digits, and be sure it has the correct unit symbol.

If you burn 10 kilograms of wood in a fire (combustion) what is the weight of the products after the fire has finished burning the wood?

Which of the following electromagnetic waves can create ions?