According to the assumptions upon which most reaction mechanisms are based, collisions must occur in order for a chemical reaction to occur, but: a. energy is destroyed in these collisions. b. some molecules react with each other without colliding. c. there are very few collisions every second. d. not every collision results in a reaction. e. only certain collisions will increase the energy of the reaction.

Which common material is an example of a polymer? (25 pts) a. steel b. plastic c. petroleum d. rubbing alcohol

When the speed of the bottle is 2 m/s, the average maximum height of the beanbag is m.

Two metal blocks that have slightly different temperatures are placed next to one another. after five minutes, they both have lower but equal temperatures. according to the law of conservation of energy, what  most likelyhappened? energy was created inside the blocks.energy was destroyed inside the blocks.energy was absorbed into the blocks from outside the system.energy was transferred from the warmer block to the cooler block.