Chlorofluorocarbons (CFCs) are greenhouse gases that, for a specific amount of mass, trap significantly more heat than CO2. How can you classify CFCs

Can someone me with 1 to 4 plz. fast

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

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.