Angela is a serious basketball player, but lately she has been struggling. First, her legs started getting tired halfway through practice. Next, her bones started aching. This week, she feels like she can’t even take a full breath.

Angela goes to see Dr. Chao. “I feel like my whole body is falling apart. How can there be so many different things going wrong with me at the same time?” Angela asks. Dr. Chao does a physical exam and asks Angela to take a few deep breaths. “Actually,” the doctor responds, “there’s only one small thing wrong with your lungs. Fortunately, there is a medicine that will improve all your symptoms right away.”

How can a problem in Angela’s lungs cause problems all over her body?

Astudent made a graph plotting the progress of a reaction over time. the student forgot to label the y-axis of the graph. a graph is shown with two graph lines. one graph line starts at a higher position on the y axis and slopes downwards towards the right. the other graph line starts at a lower position on the y axis and slopes upwards towards the right. the two graph lines stop short of intersecting each other and continue as separate lines which gradually become straight and parallel to the x axis. a vertical line is shown at a point where the two graph lines finally became parallel to the x axis. this vertical line is labeled equilibrium. the title on the x axis is time and an arrow pointing towards the right is shown above time. the title on the y axis is left blank. what best explains the label that the student should use on the y-axis? amount, because as the amount of product decreases, the amount of reactant increases over time. reaction rate, because forward and backward reaction become equal at equilibrium. amount, because the amounts of reactants and products become constant after equilibrium is reached. reaction rate, as the rate of forward reaction increases and rate of backward reaction decreases over time.