How is pH affecting catalase activity? Hypothesis The catalase activity is assumed to be the most active in pH7. The higher or lower concentration away from the optimum pH of catalase‚ the slower the rate of activity is. Data Collection & Processing I collected the results of pH4‚ pH7‚ pH10 and pH13 after 2 minutes‚ and I repeated the experiment 3 times. Below is a table to show the results‚ their averages and standard deviations: | 1st time (sec) | 2nd time (sec) | 3rd time (sec)
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-1A2 CHEMISTRY MODULE 4 definitions (aqa) Rate of Reaction The rate of change of concentration with time (mathematically d[X]/dt). Units are mol.dm-3.s-1 (moles per cubic decimetre per second) Initial Rate This is the rate at the very beginning of the reaction when all the starting concentrations are known exactly. Rate Equation Rate Expression A mathematical expression which relates the rate to the concentrations of substances involved in the reaction Rate Constant‚ k This is the multiplying
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CHAPTER 5. DISCUSSION 5.1. Water quality The average water temperature and average dissolved oxygen obtained during the experiment has been reported as the optimum range (3-10mg/l) for tilapia growth and yields (Meske‚ 1985). Siddiqui et al. (1989) stated that Oreochromis mossambicus has a low oxygen demand and can survive at low oxygen levels (1-2mg/l). Riche and Garling (2003) reported that dissolved oxygen levels should be maintained above 4.9 mg/l for best growth. The water quality tolerance
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A change in pH changes the shape of the active site of the enzyme. The bonds within the active site of the enzymes are polar‚ this means that they are extremely sensitive to ions. The decrease in pH increases the concentration of H+ ions in the solutions‚ these interact with the polar bonds in the enzymes structure to form individual bonds. This disrupts the shape of the active site and thus the substrate PNPP is no longer complementary to the enzyme’s active site. So no Enzyme substrate complexes
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Concentration of a Solution: Beer’s Law The objective of this experiment is to determine the concentration of an unknown copper sulfate solution. You will be using the Colorimeter. In this device‚ red light from the LED light source will pass through the solution and strike a photocell. A higher concentration of the coloured solution absorbs more light (and transmits less) than a solution of lower concentration. The Colorimeter monitors the light received by the photocell as either an absorbance
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Solution A homogeneous mixture of two or more substances with each substance retaining its own chemical identity. Solute – substance being dissolved. Solvent – liquid water. General Properties of a Solution 1. Contains 2 or more components. 2. Has variable composition. 3. Properties change as the ratio of solute to solvent is changed. 4. Dissolved solutes are present as individual particles. 5. Solutes remain uniformly distributed and will not settle out with time. 6. Solute
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Chemistry Textbook Notes: Solutions Chapters 13 & 14: LH 1. Define soluble‚ solution‚ solvent‚ solute‚ suspension‚ colloid (p.395398) Soluble- capable of being dissolved solvent0 the dissolving medium in a solution solute- the substance dissolved in the solution suspension- a mixture in which the particles in the solvent are so large that they settle out unless the mixture is constantly stirred or agitated colloid- a mixture consisting of particles that are intermediate in size between
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1. Define the following terms: a. aqueous solution- a solution in water b. colloid mixture of large molecules that will not settle or join with the other substance it is in c. concentration ratio of mass or volume of solute to mass or volume of solvent d. heterogeneous a mixture is made up by two or more different substance which are (mixed) together but are not combined e. homogenous mixture mixture that is uniform throughout f. Henry’s Law An expression for calculating the solubility
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Case Study #3 1. Out of the three time points‚ Max was the most dehydrated immediately after exercise. 2. The two parameters that can be used to determine Max’s hydration status is color and and pH. It is not specific gravity (SG) because Max’s SG is 1.035 which is within normal range. It is also not protein because in the lab manual it says that a trace amount of albumin in Max’s urine is normal. 3. If ADH levels increase‚ water reabsorption by the DCT/collecting ducts increases and the resulting
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Purpose The purpose of this experiment is to find out the molarity of each solution while finding out how many grams of sodium chloride we have. Materials 1. Wire gauze 2. tongs 3. Burner 4. balance 5. Matches 6. hot hands 7. ring stand 8. ring clamp 9. graduated cylinder 10. evaporating dish Procedure Steps: 1. Mass the evaporating dish 2. Record how many mL of solution you add into the evaporating dish then mass them together. 3. Set the evap. dish on the
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