John Pham Toothpick-ase Lab The Purpose: The purpose of this lab was to recreate and simulate the reaction of an enzyme with its substrate. Part A: Time (seconds) Number of toothpicks broken 20 10 Toothpicks 40 19 Toothpicks 60 30 Toothpicks 80 39 Toothpicks 100 51 Toothpicks Time Interval (seconds) Rate of reaction 0-20 .5 20-40 .45 40-60 .55 60-80 .45 80-100 .6 Analysis Questions: 1. The “Toothpickase” enzyme has 2 subunits‚ the hands‚ acting as the enzyme
Premium Enzyme Chemical reaction Reaction rate
because only a select portion of molecules during a reaction have enough energy and the correct orientation to break any existing bonds to form new ones at the moment of impact with other reactants. The very minimum amount of energy needed for this process to occur is referred to as activation energy. Collision theory explains why reaction rates differ for alternate reactions and also how chemical reactions occur in the first place. During a reaction‚ collision theory states that the higher the concentration
Premium Chemical reaction Reaction rate
Akademi‚ SF-20500 Turku (Finland.. (Received December 29‚ 1989; in final from July 5‚ 1991) Abstract A fixed-bed test reactor suitable for studying non-isothermal reaction kinetics was developed. The reactor allows axial and radial temperature measurement a.s well as online gas analysis. The water-gas shift reaction over a commercial iron-based catalyst was chosen as the subject of a case study. A non-isothermal reactor operating at temperatures between 575 and 675 K and with feed compositions
Premium Rate equation Chemical kinetics Reaction rate
Laura Marrongelli Demonstrator: Cheryl McDowall Objective The rate constant of the depolymerization of diacetone alcohol via basic catalysis was determined by monitoring the change in volume as a function of time at constant temperature of a pseudo first order reaction where the species in excess was sodium hydroxide. This was accomplished by using a dilatometer as the apparatus and following both methods: isolation and initial rates in conjunction. Introduction Depolymerization is the process
Premium Rate equation Sodium hydroxide Reaction rate
Affect of enzyme concentration to the rate of reaction Aim: With the experiment of protein solution‚ in this case egg white added to different pepsin concentrations (0%‚ 0.2%‚ 0.4%‚ 0.6%‚ 0.8%‚ 1.0%) shows‚ as the egg white is a protein and the pepsin works as an enzyme‚ how a higher pepsin concentration and therefore a larger amount of enzymes effect the rate of reaction. Hypothesis: An increased concentration of pepsin speeds up the time the mixture needs to come clear. Introduction:
Premium Chemical reaction Chemistry Enzyme
of the reaction between sodium thiosulfate and Hydrochloric acid is: S2O32- (aq) + 2 H+ (aq) SO2 (g) + S (s) +H2O (l) Using beakers with the same diameter was very important in conducting the experiment. If different sizes were used‚ the visibility of the “x” on the paper beneath the beaker could disappear from view too early or too late than the hypothetical time depending on the depth of the solution. It was also significant to use the same timer in recording the time of reaction because
Premium Chemical reaction Reaction rate Chemical kinetics
SYLLABUS CHEMISTRY (043) CLASS-XII – (2012-13) Annexure - ‘ I ’ S.No. 1. 2. 3. 4. Type of Question Long Answers (LA) Short Answers-II (SA II) Short Answers-I (SA-I) Very Short Answer (VSA) Total Marks for No. of Total Marks each Question Questions 5 3 2 1 3 9 10 08 30 15 27 20 08 70 Weightage 4 5 5 5 4 3 8 5 3 4 4 6 4 4 3 3 70 Total: S.No. UNIT 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. Solid State Solutions Electrochemistry Chemical Kinetics Surface Chemistry General Principles
Premium Chemistry Chemical reaction Reaction rate
Kinetic study of a Solvolysis (Sn1) Reaction Aneadra Bowles Adasia Rutledge Krystal Flakes Robert Grimes Jasmine Ross June 5‚ 2012 Purpose: The purpose of this experiment is to use kinetics to study a solvolyis reaction Introduction: The purpose of this experiment is to understand the kinetics of the hydrolysis of t-butyl chloride.The kinetic order of reaction was studied under the effects of variations in temperature‚ solvent polarity‚ and structure. It is particularly observed in
Premium Chemical kinetics Chemical reaction Solvent
into a glass of water is the result of a chemical reaction. After dropping the tablet into the water‚ the reaction causes the solid tablet to become dissolved and releases tiny bubbles of carbon dioxide. This reduces the time it takes for the medicine to work as it does not need to dissolve inside the body. Research Question: How does the surface area affect the rate of the reaction? Varaibles• Independent: Surface Area • Dependent: Rate of Reaction (time) • Controlled: Water temperature‚ Volume of
Premium Chemical reaction Reaction rate Chemical engineering
kinetics of the reaction can be monitored due to the carbocation form of the dye by measuring the decrease in absorbance at the wavelength corresponding to the absorption maximum(λmax). The hydrolysis is carried out by using a large excess of NaOH (more than 10-fold) with respect to the substratecrystal violet such that the reaction (CV+ + OH-↔ CVOH) obey the pseudo-first order reaction rate equation -d[CV+]/dt = kw[CV+][OH-]=k[CV+] Where k=kw[OH-] is the pseudo-first order rate constant and kw is
Premium Rate equation Reaction rate Chemistry