in order for a reaction to occur, reactant molecules must collide with each other. true or false

An engineering team designs a new rocket that is faster and lighter than any other model being produced. however, the materials end up being so expensive that no company can afford to buy them. which step of the engineering process should have addressed this problem? a. know the background. b. evaluate the results. c. identify a need. d. do the work.

What are transitions between a liquid and a solid called? identify which way they are transitioning

What will most likely happen when two bromine atoms bond together?