We discovered that we were going to observe and understand the conditions under which diffusion, dialysis, and osmosis occur. Then we constructed models of diffusion, dialysis, and osmosis. We predicted that the direction of change would be from the membrane to the beaker. We understood how these processes affected the selectivity of the cell membrane. The second part of the lab was dealing with dialysis. In this part we studied starch and sodium chloride for dialysis activity. In Part A We hypothesized that NaCl existed in 1-3 and AgNO existed 2-4.
In Part B We hypothesized that there will be more changes in the cell then outside the cell. In Part C We hypothesized that there will be a difference due to the different environments that are provide to help change the appearance of a molecule. Procedure A. Qualitative testing for sodium chloride and starch We got 6 clean test tubes and number them 1-6. Test tubes 1&2 had 5ml of 10% sodium chloride (NaCl).
Test tubes 3&4 had 5ml of starch. Test tubes 5&6 had 5ml of distilled water. We added 2-3 drops of silver nitrate (AgNO )to 1,3,5. We added 2-3 drops of iodine solution to 2,4,6. B. Dialysis of a starch/sodium chloride mixture
Get one dialysis tube and tie one end. Fill the bag with 5ml of 10% Sodium chloride solution and 5ml of starch solution from Part A. then tie the tube and place it in a beaker of distilled water. Leave the tube for 30 minutes. Afterwards test for the presence of starch and sodium chloride. Then split the solution into to test tubes and 2-3 drops of iodine into one test tube and 2-3 drops of AgNO in the other test tube. C. Osmosis using dialysis tubing as a model of the cell membrane Obtain 5 beakers and label them 1-5. Fill beakers 1-4 halfway with distilled water. And beaker 5 with 30% sucrose halfway.
The Essay on Sodium Chloride Oxygen Beaker Enzyme
DESCRIPTIVE TITLE The Effect of Different Amounts of Sodium Chloride on the displacement of oxygen. INTRODUCTION The dependability of the rate of an enzyme-mediated reaction is based on two factors: the substrate concentration and the concentration and action of the enzyme that catalyzes the reaction (Vander, et. al. , 2001). Enzymes are catalysts that produce chemical reactions in cells. Enzymes ...
Obtain 5 dialysis tubes that will be filled with 10ml of different solutions. Tube 1 has distilled water, Tube 2 has 10% sucrose, Tube 3 has 20% sucrose, Tube 4 has 30% sucrose, and Tube 5 has distilled water. Tie the tubes and weigh each of them before placing them in there respected beakers. Every 15 minutes weigh the tubes to record the change. There will be 5 tables for each beaker. Results A. TT1: yes NaCl; TT2: no AgNO; TT3: no NaCl; TT4: yes AgNO; TT5: no NaCl; TT6: no AgNO B. Test Tube 1Test Tube 2 Outside: no starch; Inside: yes starch; Outside: yes salt; Inside: yes salt C. #1 TIME 0 -9. 7 15 -9. 30 -9. 7 45 -9. 7 #2 TIME 0-9. 8 15-10. 3 30-10. 8 45-10. 9 #3 TIME 0-9. 8 15-10. 8 30-11. 5 45-11. 9 #4 TIME 0-10. 9 15-12. 4 30-13. 1 45-15. 7 #5 TIME 0-9. 5 15-8. 3 30-7. 5 45-6. 8 Conclusion In Part A we found that test tube 1 had NaCl and test tube 4 had AgNO . Test tubes 2,3,5,6 had no change and no presence of starch nor salt. Part A was the easiest part in this three part lab. There weren’t any problems in this section which allows me to move on to the next section. This proving that our hypothesis was right because it meant that there was going to be sugar and salt present in the experiment.
In Part B we found that outside test tube; salt existed and not sugar. But inside the test tubes both the starch and the salt existed in the two different tubes. In this part there weren’t any problems and we were successful in gathering the necessary results to move to the next section. This helping prove our hypothesis right because it meant that there would be more changes inside the cell than outside the cell. In Part C we found that Beaker 1 had no changes in weight. In Beaker 2 there were changes that ranged from 0-1. 1. In Beaker 3 there were changes that ranged from 0-2. 1.
The Essay on Bunsen Burn Candle Beaker Test
Chemistry Coursework Burning Candles Aim: To find out what effects how long a candle burns. Prediction: I predict that the less amount of oxygen that the flame has the less time it would stay a lit for. The flame gives out heat. The oxygen turns to carbon dioxide because of the carbon in the candle. The carbon dioxide formed puts out the candle. Method: Input Variable- We change the size of the ...
In Beaker 4 there were changes that ranged from 0-4. 8. In Beaker 5 there were changes that ranged from -2. 7-0. This is the results that my group gathered from another group that did well because our results were way off and inconsistent. So we were forced to use better results to find better explanations. We understood that the conditions under which osmosis is possible and to what degree it occurs. There were three different types of temperate environments. This helping prove our hypothesis right because it meant that different environments help change the appearance of a molecule.
