A compund is formed by the substitution of two chlorine atoms and for two hydrogen atoms in propane. What is the number of structural isomers possible? no links.. .​

In an energy pyramid, which level has the most available energy?

The minerals found in bones are deposited by living cells called

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.