An adult takes about 12 breaths per minute, inhaling roughly 500ml of air with each breath. the molar compositions of the inspired and expired gases are as follows: species inspired gas (%) expired gas (%) o2 20.6 15.1 co2 0.0 3.7 n2 77.4 75.0 h2o 2.0 6.2 the inspired gas is at 24°c and 1 atm, and the expired gas is at body temperature and pressure (37°c and 1 atm). nitrogen is not transported into or out of the blood in the lungs, so that n2in n2out. (a) calculate the masses of o2, co2, and h2o transferred from the pulmonary gases to the blood or vice versa (specify which) per minute. (b) calculate the volume of air exhaled per milliliter inhaled. (c) at what rate (g/min) is this individual losing weight by merely breathing? (d) the rate at which oxygen is transferred from the air in the lungs to the blood is roughly proportional to po2 air po2blood , where po2blood is a quantity related to the concentration of oxygen in the blood. compared to regions where atmospheric pressure is 14.7 psia, what effect 17 see problem 4.17 for definitions and source of data. safety bioengineering 250 chapter 5 single-phase systems does the atmospheric pressure in denver, which is approximately 12.1 psi, have on the transport rate and breathing rate? how does the body adjust to address this condition?

List the two type of transporst that the cell in orde to transport molecules acroos the membrane

Experiment: effect of solution concentration on reaction rate you have learned that as the concentration of reactants increases, there will most likely be a greater number of collisions, and hence increase the rate of a reaction. in this experiment, you will see a demonstration of this, with a twist. there will be three reactions going on in this experiment. objectives determine how solution concentration can affect the rate of a reaction. the first reaction will be a reaction of the iodide ion (i-1) with hydrogen peroxide (h2o2) in an acidic solution. this reaction produces a slightly orange solution. in our experiment, we will add some orange food coloring to make this solution more orange. 2 h+ (aq) + 2 i- (aq) + h2o2 (aq) ⟶ i2 (aq) + 2 h2o (l) the next reaction will be between the iodine and starch i2 + starch ⟶ i2-starch complex (blue-black) so, when starch is added to the iodine solution made from the first reaction, the solution will turn black immediately, so it is difficult to find the rate of reaction. in order to be able to time this reaction, you will slow it down with another reaction. adding ascorbic acid will react with the iodine, reducing the concentration of the iodine available to react with the starch. c6h8o6 (aq) + i2 (aq) ⟶ 2i- (aq) + c6h6o6 (aq) + 2 h+ (aq) when the ascorbic acid is used up, the remaining iodine molecules can react with the starch and form the black color. the more ascorbic acid you add, the slower the reaction to form the iodine-starch complex will be. use your data and observations to complete the assignment. analysis and conclusions submit your data and the answers to these questions in the essay box below. what was your hypothesis? plot your data as drops of ascorbic acid vs. time. as the concentration of ascorbic acid was increased, did the rate of the formation of the iodine-starch complex increase or decrease? explain your answer in terms of the chemical reactions involved. was your hypothesis correct? make a general rule about the effects of concentration of reactants on reaction rates. for practice, the molecular formula for ascorbic acid is c6h8o6, and you used 6 g in this experiment, calculate the molarity of the ascorbic acid. now calculate the concentration in moles per drop (assume 1 ml = 20 drops).

Which of the following changes will decrease the total amount of gaseous solute able to be dissolved in a liter of liquid water? (2 points) decreasing temperature decreasing pressure decreasing surface area decreasing solute concentration