Que significa reflexion de la luz

Can a molecule have bond dipoles but not have a molecular dipole?

You have 80 g of 60oc water and 80 g or 10oc water. what is the final temperature when the two are mixed? explain.

In a particular chemical reaction, the energy of the reactants is 30 kj and the energy of the products is 5 kj. 
 the maximum energy of the system is 40 kj. sketch a potential energy diagram for this reaction. make sure to label the energy of the reactants, the energy of the products, the activation energy, and the enthalpy change for the reaction.