substance in order to ascertain the nature of its chemical constituents (Qualitative analysis). The substances that could be found were iron‚ cinnamon‚ corn starch‚ baby powder‚ copper‚ and strontium. A magnetism test was used to determine whether iron or cinnamon was contained in the substance. An iodine test was used to indicate whether corn starch or baby powder was contained in the mixture because it is an indicator. An indicator is a substance that undergoes a distinct observable change when conditions
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EXERCISE 3 PHYSICO-CHEMICAL REACTIONS IN THE CELL ACTIVITY SHEET BROWNIAN MOVEMENT: 1. What is Brownian movement? - 2. Is there a difference in the speed of movement among the different sized particles of India ink? If so‚ explain the difference. - 3. Is there a difference in the speed of movement of the India ink particles in hot and cool slides? If so‚ explain. - DISPERSION SYSTEMS IN PROTOPLASM 4. DEFINE THE FF: a. Solute: The dissolve matter in a solution; The
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Lab 4 – The Cell Answer Key Procedure 4.3 Draw a picture of a single Elodea cell and label all visible structures. See the diagram in your lab manual. Without staining‚ the only structures that should have been clearly visible should have been the cell walls and the green chloroplasts. Is this cell prokaryotic or eukaryotic? ______Eukaryotic_______________________ What evidence do you have to support this claim? The presence of organelles (chloroplasts) and its large size.
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electrons from aldehyde or ketose group of reducing sugars to form cuprous oxide‚ a red brown precipitate. Materials: The materials used in order to detect starches was: test tubes‚ distilled water‚ Benedict’s solution‚ starch were used. Negative Control: H20 Positive Control: Starch Obtain nine test tubes and number them 1-9 Add to each tube the materials to be tested. Add 2ml of Benedict’s solution to each tube. Place all the tubes in boiling water- bath for 3 minutes and observe color changes
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Title : The Vitamin C content of fruit juice Aim : To investigate the vitamin C content of fruit juice. Introduction : [2]Vitamin C‚ also known as the ascorbic acid or the L-ascorbate‚ is required for the growth and repair of tissues in all parts of our body. It is necessary to form collagen‚ an important protein used to make skin‚ scar tissue‚ tendons‚ ligaments‚ and blood vessels. Vitamin C is essential for the healing of wounds as well as for the repair and maintenance of cartilage‚ bones
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solution‚ (Na2S2O3‚ 160 cm3) 1 M potassium iodide solution‚ (KI‚ 20 cm3) 0.5 M H2SO4‚ (150 cm3) freshly prepared starch solution. Apparatus Titration apparatus Principle In this experiment you are required to determine the vitamin C content of a commercial tablet and compare this with the manufacturers specification. Vitamin C is ascorbic acid‚ which is rapidly and quantitatively oxidized by iodine in acidic solution according to the following equation Ascorbic acid The standard method
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to an area of lower concentration. Because of the selective permeability of the membrane only water and other very small particles (iodine) can be diffused through simple diffusion. The solution out of the dialysis tubing had a higher distelled iodine concentration of solutes (iodine + H2O) than did the starch solution. So iodine move into the cell and react with starch molecules to formed starchiodine‚ the blue compound‚ with a specific rate. The test show that mean rates of diffusion are significantly
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amylase Bacteria and Fungi with the presence of starch is the purpose of this experiment. Optimal conditions are known as conditions in which organism are able to thrive in‚ where it is able to function at its best. If an organism was to surpass its optimal temperature‚ the denaturing of the active site occurs‚ which means that it changes form‚ which in turn prevents the binding of substrates. For this experiment‚ amylase is an enzyme‚ which starch and glycogen is converted into a simple sugar.
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Effect of different temperatures on the rate of an enzyme controlled reaction I will place starch and amylase into five water baths which are at different temperatures‚ and record the time it takes to break down the starch in the solution. Independent variables The independent variable is what I am going to change in my experiment. In this case it is the temperature of the water in the five water baths- 10‚ 25‚ 40‚ 55‚ 70 degrees Celsius Dependant variable This is what will stay the
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experiment conducted was to observe if a higher concentration or lower concentration gradient would affect the diffusion rate of the iodine moving through the starch concentration. This was shown to be an accurate experiment as with a higher concentration gradient the diffusion that did occur happened a lot faster and diffused more efficiently compared to no iodine solution and just water. This is due to the molecular collisions speeding up the experiment in the time period given because of the Soule
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