You need to analyze the fuel oil in a river that runs along a highway. You start by collecting the sample. Fuel oils are best analyzed by gas chromatography. Aqueous sohutions don't work well in a GC. Therefore you need to extract the fuel oil into an organic phase. Fortunately, being an organic molecule fuel oil is more attracted to an organic solvent than to an aqueous one. The distribution coefficient is 8.3. Your lab has been extracting 100 ml aqueous samples with three 10 ml aliquots of petroleum ether. You think that takes too much time so you shortcut the procedure by performing only one extraction with the whole 30 ml of petroleum ether. What is the percent error introduced by your haste?

What does a particular point on a line of a phase diagram represent? o a. the maximum temperature a substance can exist at without bonds breaking b. the pressure created by the kinetic energy of molecules at a particular temperature c. the melting point or boiling point of a substance at a specific pressure d. the conditions in which temperature and pressure have equal effects on a substance

According to periodic trend, which of the following most likely has the highest ionization energy? kr be ni sc

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.