solution on the rate of the reaction when reacting with dilute hydrochloric acid. It is hypothesized that as the concentration of the sodium thiosulfate solution increases‚ the rate of the reaction will also increase proportionately. Variables The independent variable is concentration. This will be varied by increments of 10mL (10mL to 50mL) and distilled water will be added accordingly to maintain a constant volume of 50mL. The dependent variable is the rate of the reaction. This will be indirectly
Premium Chemical reaction Chemistry Chlorine
Given the evidence‚ it can be determined that a reaction will occur when reactants have a kinetic energy greater than the activation energy‚ this is a theory of collision theory. For example‚ in the first experiment‚ the test tube filled with 10 mL of 3% hydrogen peroxide and had scoop of manganese dioxide‚ had a greater reaction than the other test tube. Which simply contained 10 mL of 3% hydrogen peroxide. The factor that affected the reaction rate was that the manganese was seen as a catalyst
Premium Chemical reaction Reaction rate Chemistry
over a time limit of 600 seconds for a reaction between copper (II) sulfate (CuSO_4) and zinc(Zn) using a temperature probe. Time/ s (± 1 s) Temperature / °C (± 0.05 °C) 0 27.9 30 25.9 60 25.9 90 25.8 120 25.8 150 48.7 180 57.6 210 61.1 240 62.7 270 63.5 300 62.8 330 61.3 360 59.3 390 58.9 420 57.7 450 56.5 480 55.2 510 54.2 540 52.6 570 51.9 600 51.1 Qualitative observations:- Table 2: table depicting the qualitative observations observed during the reaction between Copper (II) sulfate solutions
Premium Chemistry Sulfuric acid Copper
An investigation to show how the rate of reaction between hydrochloric acid and sodium thiosulphate is affected by the concentration of the acid Simple Procedure Place a conical flask on a piece of paper with a cross on it. Add hydrochloric acid and sodium thiosulphate‚ and record the amount of time taken for the cross to disappear through the solution from the top of the flask. Record this time and repeat this for different concentrations of hydrochloric acid. Fair Test The variables in
Premium Chemical reaction Chemistry Concentration
Enzymes lower the activation energy of chemical reactions but they themselves are not consumed or altered when doing so. These catalysts work best at optimum temperatures and pH’s. The temperature and pH at which the reaction occurs the quickest is the ideal condition for the enzymatic reaction. Alpha amylase converts starch into glucose and when starch is combined with I2KI indicator a dark purple solution forms. As the enzyme breaks down the starch the absorbency will decrease. The absorbency
Premium Enzyme Chemical reaction Catalysis
Factors Affecting Reaction Rate Bob Jones Josh October 2‚ 2014 Period 3 Introduction: In reference to the collision theory‚ molecules act as small spheres that collide and bounce off each other‚ transferring energy among themselves when the collide. In order for a reaction to occur‚ there must be collisions between molecules. Through experimentation‚ factors are discovered that influence the reaction rates of chemical reactions include the concentration
Premium Chemical reaction Reaction rate Chemical kinetics
out so that tubes containing a reaction solution of the Amylase enzyme and starch were simultaneously mixed. The reactions were then introduced to I2-KI‚ which stopped the reactions‚ at two minute intervals. Each of these trials was repeated three times to ensure proper accuracy. After concluding the reactions they were placed into a spectrophotometer (A580) for analysis. Graphing the values of the absorbance to time for each pH it was found that the rate of reactions in the neutral pH solutions were
Premium Enzyme PH Chemical reaction
Ryan Kawiecki Ms. Lahr Ap-Biology September 17‚ 2013 Title: The Effect of Abiotic and Biotic Factors on Enzymatic Reactions Problem: Will increased pH affect the rate of reaction in an enzyme catalyzed reaction? Hypothesis: Increased pH substance will increase the rate of reaction Table: Table 1: Baseline of peroxide Time (min) Qualitative color 1:00 5 2:00 6 3:00 7 4:00 8 5:00 9 Table 2: effect of increased pH on peroxidase Increased pH by 5mL Color intensity
Premium Enzyme Catalysis Chemical reaction
more mL of hydrogen peroxide‚ the reaction occurred again. Again‚ small bubbles formed; intensity of (1). The solution did not change in temperature. The reaction lasted about 15 minutes. 3. After adding more manganese dioxide‚ the reaction occurred again. This time‚ the bubbles being formed were larger; intensity of (4). The solution got a little warmer‚ but the difference in temperature was hardly distinguishable by simply touching the test tube. The reaction lasted about 10 minutes. 4. a) The
Free Chemical reaction Enzyme Catalysis
Determine the Activation Energy of the Reaction between Br— and BrO3— in Acid Solution S.6 ( ) Name: [ ] ( ) Time allowed: 55 minutes Introduction: The reaction can be represented by 5Br—(aq) + BrO3—(aq) + 6H+(aq) → 3Br2(aq) + 3H2O(l) The progress of the reaction may be followed by adding a fixed amount of phenol together with some methyl red indicator. The bromine produced during the reaction reacts very rapidly with phenol. Once
Free Chemical reaction Chemical kinetics Chemistry