Directions Tie a piece of semipermeable membrane around the mouth of the thistle tube using a tight rubber band or string.
Dissolve a teaspoonful of sucrose in about 20 milliliters of water.
Invert the sealed thistle tube into a beaker containing water and hold it securely using a ring stand and clamp. You may have to use some tissue around the clamp to secure the tube tightly without breaking the glass.
Pour the sugar-water solution into the stem of the thistle tube so the level of the sugar water within is even with the level of the water in the beaker. Set this experiment aside until the next day.
Answer the following questions:
What do you observe after twenty-four hours?
What two molecules (molecular species) are involved in this experiment?
In which region was the concentration of water greater—inside or outside the thistle tube—when you first set up the experiment? Explain.
Based on what you have learned about membranes and osmosis, how could you explain the results of this experiment?

Consider the motion of the balloon and its air contents in terms of momentum. in step 1 above, the total momentum of the balloon and its contents was zero. recall that momentum = mv. both the balloon and the air inside it had a velocity of zero and therefore the total momentum was zero. now think about what happened when the air escaped from the balloon. a certain mass of air accelerated in one direction. in order to keep the total momentum of the system zero, the balloon itself (which has mass) had to accelerate in the opposite direction. use this scenario to you explain why the soda can rotates when the water squirts out of the escape holes. what was your hypothesis concerning the water-filled can? according to your data, do you think your hypothesis was correct? (be sure to refer to your data when answering this question.) summarize any difficulties or problems you had in performing the experiment that might have affected the results. describe how you might change the procedure to avoid these problems. give at least one more example of newton's third law in everyday life.