In this activity, you’ll watch a video of an experiment that relates to climate change. The experiment compares the effects of heat on carbon dioxide and air. Watch the video now. Then answer the series of questions below. Part A In the video, the experimenter used a model to represent a phenomenon observed in the natural world. What did the light and each of the flasks represent in this model?

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.