The valence of aluminum is +3, and the valence of chlorine is –1. the formula for aluminum chloride is correctly written as
a. al3cl.
b. alcl3.
c. clal3.
d. cl3al.

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms