Cover these leaves with some drops of iodine solution and observe; Observation: Alcohol breaks down the chlorophyll and hot water kills the leaf. Hence, the leaf is no more green in color; When leaves are treated with iodine, one of them turns its colour to blue-black due to the presence of starch with iodine as an indicator.
Feb 02, 2009 · State Lab Review Packet Lab #3 Making Connections Key Points: 1. Resting pulse varies with each individual 2. Pulse rate increases under physical or emotional stress. 3. Increase in activity produces muscle fatigue. 4. By collecting data scientists can help to answer questions they have proposed. 5. Use the scientific method to solve a problem. 6.
Picture of Hyperhidrosis: Starch-Iodine Test Hyperhidrosis , or excessive sweating , is a common disorder that produces a lot of unhappiness. An estimated 2%-3% of Americans suffer from excessive sweating of the underarms ( axillary hyperhidrosis ) or of the palms and soles of the feet (palmoplantar hyperhidrosis ).
Students can work individually or in groups of two to four. If the students work in groups, they can share equipment and duties. For efficiency, one student might perform the tests in this lab, while another observes and records findings. They can change roles for some activities. Answer Key to Questions Asked on the Student LabSheet
May 24, 2020 · You can add the iodine directly to your samples or place the iodine in the bottom of a cup, lay your sample on a paper towel, and place it on top of the iodine. X Research source If you are unable to find an iodine solution you can also use Betadine (povidone-iodine mix), Lugol’s (a mixture of iodine and potassium), or a tincture (where the ...
4. STAIN with iodine (Lugol’s) stain, as demonstrated by the teacher. 5. Put on a cover slip; be sure to angle the cover slip to avoid air bubbles. 6. Locate cells on LOW power and then bring up to MEDIUM power and then HIGH power. 7. Observe, draw, and label.
Explain your answer. (Vegetables should be soaked in plain water. Because of the high concentration of water outside the cells, water will flow into the cells. As the cells and central vacuole fill up with water, cells will become rigid.) Have students answer the Conclusions questions of the worksheet in their lab notebook.
Aug 07, 2019 · Here, two clear, colorless solutions (named solutions A and B) react to form a blue-black solution, due to the reaction between starch and iodine. When either solution is heated to different temperatures or a series of concentrations is made students will be able to observe a measurable difference in reaction rate.