Which is a sign of chemical change?

a. chocolate syrup dissolve in milk
b. folding paper changes the size
c. toast smells different than bread

Describe the interaction that occurs between two objects with the same electrical charge.

What is the compound name for the formula [ru(en)2cl2]2+ and [co(en)cl2br]-

As we move from left to right across the periodic table, what is the general trend? a) atomic radii increase. b) electronegavitiy decreases. c) nuclear shielding increases. d) metallic character decreases.