Burning a log is an example of a. an endothermic reaction b. a solution. c. a catalyst. d. an exothermic reaction

Clouds form when water vapor to form small droplets. a. humidifies b. condenses c. evaporates d. precipitates

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.

Joan writes four numbers on the board in standard form, and then she writes their scientific notation