When calcium oxide reacts with water, the energy that is released when new bonds form in the product is greater than the energy that is needed to break the bonds in the reactants. What type of reaction is this?

Which function is performed by earths atmosphere? a. ultraviolet rays are prevented from reaching the ozone layer. b. earths temperature is raised and moderated by trapping in heat c. charged particles from the sun are prevented from reaching earth. d. magnetic charges from space are prevented from reaching earths surface.

Ahydrogen atom has 1 electron. how many bonds can hydrogen form? a) 1 b) 2 c) 3 d) 4 e) 5

All motion is caused by force? true or false