The graph for run 1‚ which plotted ln(Abs at 595nm) versus time‚ a first order reaction‚ with an R^2 value of 0.99621 was the most linear. Therefore‚ crystal violet is a first order reaction. The observed rate constant from run 2‚ as shown in figure 4‚ was significantly lower then the observed rate constant from run 1‚ shown in figure 1. Therefore‚ the R^2 for the first order reaction for run 2‚ 0.946418‚ represented in figure 4‚ which is also extremely low‚ was not taken into consideration for calculations
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find the order of a reaction Introduction When peroxodisulfate (VI) ions and iodide ions react together in solution they form sulfate (VI) ions and iodide. This reaction is shown below: S2O82-aq+ 2I-aq SO42-aq+ I2(aq) The reactants and the sulfate (VI) ions are colourless however the Iodine is a yellow/brown colour. This allows you to measure the progress of the reaction through the colour change when the iodine is produced. In order to determine the order of the reaction we need to measure
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LANNING Aim: Our aim is to detect which factors affect the rate of the decomposition of hydrogen peroxide with a fixed mass of catalyst. A catalyst is a substance‚ which alters the speed‚ or rate of a chemical reaction but is chemically unchanged at the end of the reaction. The two factors that we can change are the temperature and the concentration. We chose to vary the concentration of hydrogen peroxide. The catalyst to speed up the reaction without affecting the result will be manganese oxide. Prediction:
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EFFECT OF INTEREST RATE ON FOREIGHN EXCHANGE RATE (EVIDENCE FROM ASIAN REGION) ABSTRACT: In this article we investigate the impact of a change in U.S. short term interest rates relative to those in some Asian countries like Bangladesh‚ Thailand‚ Japan‚ Pakistan‚ and China on the bilateral foreign exchange rates between the U.S dollar and each country’s currency. Several factors determine the exchange rate of a country. A higher currency makes a country’s exports more expensive and imports cheaper
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5.05 – Rate and Collision Theory Materials: -Water -Alka-Seltzer tablets -Thermometer -2 Small glass cups -Phone (to use as a timer) -2 big class cups Procedure: 1. Using the glass‚ fill it with water that is 25 degrees Celsius‚ use the thermometer to make sure the temperature is correct. 2. Have my phone ready to time how long it takes for the tablet of alka-seltzer to dissolve in the water. 3. Then‚ getting another cup‚ we have room temperature water. Then‚ we drop another alka-seltzer
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temperature on reactions between the enzyme catalase found in animal tissue with the substrate H2O2. The hypothesis stated that an increase in the temperature of the substrate would create a subsequent increase in the rate of reaction between the enzyme and the substrate. This hypothesis was tested by immersing 1cm cubes of animal tissue (sheep liver) which contained the enzyme catalase into the substrate (H2O2 ) mixed with detergent which foamed showing a visual display of the reaction. After 10 seconds
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Clock reactions If you choose a project that explores the kinetics of a chemical reaction you will need a way of measuring the rate of the reaction. Clock reactions provide an interesting way of doing this for some systems. In a typical reaction the first part of a graph showing the concentration of product against time is approximately a straight line (see Figure 1). If you choose any value of concentration that lies on this straight line (say c1) the initial rate of reaction can be found
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Growth rates and how to calculate them. Growth rates can be tricky to calculate and interpret and many people get confused. So here’s how to get ahead of everyone. Let’s start with a time series where we know the answer. In the example below‚ X starts at 100‚ grows 3%‚ then falls back again‚ then grows 3% again. So over the three years‚ it has grown from 100 to 103. 1 Year 2000 2001 2002 2003 Average CAGR 2 3 4 X Growth X DlnX 100 103 0.03 0.0295588 100 -0.0291262 -0.0295588 103 0.03 0.0295588
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The Rate of a Reaction Chemical Kinetics is the area of Chemistry that is concerned with the speed‚ rate or mechanism at which a chemical reaction occurs. Reaction Rate is the change in the concentration of a reactant or product with time (i.e. M/s). It measures how fast a reactant is consumed and how fast a product is formed. 1.2 WRITING RATE EXPRESSIONS Consider the following hypothetical reaction. A + 2B ( 3C + D Rate = - rate of consumption of A = -[pic]rate of
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Virtual Lab: Enzyme Controlled Reactions Worksheet 1. Which of the following does NOT apply to an enzyme: Inorganic 2. When an enzyme catalyzes a reaction: Substrate(s) bind in the active site 3. Which of the following would interfere most with the ability of an enzyme to catalyze a reaction? Reduced concentration of substrate available 4. Feedback mechanisms regulate the rate of enzyme activity‚ effectively “turning off” an enzyme
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