2nahco3(s) + 129kj → na2co3(s) + h2(g) + co2(g) what is the best description of the energy exchange in this reaction? a) when heated, baking soda decomposes. this is an exothermic reaction. b) when heated, baking soda decomposes. this is an endothermic reaction. c) baking soda absorbs energy when heated. it is an exothermic reaction. d) baking soda releases energy when it decomposes. it is an endothermic reaction.

•what conclusions can you make about the relationship between the volume of a gas and its temperature? • what conclusions can you make about the relationship between the volume of a gas and its pressure? • what possible variables have you not accounted for? as you did the procedures, is it possible that the atmospheric pressure may have changed? if it did change over the course of your experiment, then how would your results have been affected?