Final answer:
The reaction described converts A molecules into B, with the reaction progressing towards equilibrium and the formation of B over time. The change in A and B molecules is graphed to show the reaction direction and help determine its order. Different methods, including drawing and graphing, are used by chemists to depict chemical reactions.
Step-by-step explanation:
Based on the information provided in the diagrams and descriptions, it appears that the reaction progresses as A molecules decrease and B molecules increase over time, which is consistent with the conversion of A to B. The change in the number of A and B molecules as a function of time indicates that the reaction is moving towards equilibrium. The presence of an arrow suggests that the reaction is proceeding in one direction, likely under specific conditions that favor the formation of B from A, although it doesn't rule out the possibility of a reversible reaction.
For the reaction depicted in the graph, which shows the concentration changes over a minute, one could deduce that the reaction is shifting towards the formation of B, aligning with the representation of a simple exothermic reaction where reactant A is converted into product B. Chemists can describe such reactions through various methods, including drawing, but for quantitative analysis, graphing the data can help determine the order of the reaction, as indicated in the 'Check Your Learning' section.
The diagrams in the experiment illustrating two-step exothermic reactions with different changes in enthalpy show that although the reactions share similarities, they are distinct processes with different overall reactions.