Observations of Chemical and Physical Change PART 1 – OBSERVATIONS OF CHEMICAL CHANGE No credit will be given for this lab report if the Data section is not completely filled out and if the required photographs are not received. At least one photograph must show the student’s face. OBJECTIVES 1. Observe physical and chemical changes. 2. Define physical and chemical change. 3. Identify the relationship between a chemical change and a chemical reaction. 4. Observe several indicators of a chemical reaction
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But the 3% took almost the whole 7 minutes to finish rising in temperature. So essentially‚ the higher the concentration of hydrogen peroxide‚ the faster the reaction will take place. Furthermore‚ the foam (water and oxygen produced by the potatoes catalase reacting with hydrogen peroxide) was a kind of indicator of how the reaction was going. It almost indirectly related to the temperature increase‚ because every time the temperature was rising there also seemed to be foam also rising at the
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Biology Controlled Assessment. Kenishia Pascal 10x3. Investigating How Different Concentration Effects The Rate Of Reaction. Strategy A Possible Factors * Source of catalase * Concentration * Surface Area of enzyme * Concentration of enzyme * pH * Temperature Chosen Factor We chose to investigate the concentration of enzyme as we had previously investigated the optimum temperature for catalase in the preliminary investigation. Concentration of enzyme
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enzyme involves monitoring the change in absorbance of the reaction medium at 405 nm. Exergonic (i.e energy producing reactions) exhibit a negative free energy change. Sometimes these reactions occur spontaneously‚ but generally some energy must be supplied to initiate the reaction; in other word an energy barrier exists between the reactants and the products. The “energy barrier” represents the activation energy of a chemical reaction. In this practical the activation energy of hydrolysis
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b) Write the anode and cathode half-reactions‚ and the net cell reaction for the above diagram. [ T/I / 2 ] Oxidation: Zn (s) Zn2+ (aq) + 2e- Reduction: Cu2+ (aq) +2e- Cu(s) Zn (s) + Cu2+ (aq) +2e- Zn2+ (aq) + 2e- + Cu(s) Zn (s) + Cu2+ (aq) Zn2+ (aq) + Cu(s) c) Write the cell notation for the above galvanic cell drawn. [ T/I / 1 ] Cu(s) | Cu2+(aq) || Zn 2+(aq) | Zn (s) d) Calculate the percent error of the cell potential for the above galvanic cell. Show all
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neutralization reaction Introduction: When an alkali neutralizes an acid‚ a salt and water are formed. Aqueous hydrogen ions (H+(aq)) from the acid react with the hydroxide ions (OH-(aq)) from the alkali‚ forming water. For hydrochloric acid and sodium hydroxide: H+(aq) + Cl-(aq) + Na+(aq) + OH-(aq) → Na+(aq) + Cl-(aq) + H2O(l) Hydrochloric acid Hydrochloric acid Sodium Chloride Sodium Chloride Sodium Hydroxide Sodium Hydroxide Neutralization is an exothermic reaction which means
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Ice Calorimeter Determination of Reaction Enthalpy Shannon Wedepohl 9/17/13 Abstract: During this experiment‚ an ice calorimeter was used to measure the change in volume in milliliters of magnesium metal and 1.00 M of sulfuric acid. We found the experimental molar enthalpy of the reaction to be ∆H = -370 ± 1 kJ/mol at 0˚C. This compares with an expected value of -466.9 kJ/mol at 25 ˚C‚ a 20.75% difference. Introduction: Many chemical reactions truly only encompass changes by
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Purpose: In this experiment I will predict the amount of product produced in a precipitation reaction using stoichiometry by accurately measuring the reactants and products of the reaction. I will also determine the actual yield vs. the theoretical yield by calculating the percent yield. Materials: 1 Distilled water 1 Paper towels 1 Small paper cup 1 Coffee cup or mug 1 Beaker‚ 100 mL‚ glass 1 Funnel 1 Cylinder‚ 25 mL 1 Goggles-Safety 1 Scale-Digital-500g 1 Weighing boat‚ Plastic 1 CaCl2·2 H2O-Calcium
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that acts on a molecule called substrate and it also significantly speed up a chemical reaction by lowering the activation energy. In order to learn about the enzyme and its behaviour‚ this lab practical is conducted to examine the kinetic of the enzyme alkaline phosphatase. As illustration‚ when alkaline phosphatase is added to a substrate called p-Nitrophenyl phosphate (colourless in alkaline solution)‚ a series of reaction takes place and eventually releases a product called p-nitrophenol (yellow
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rate of reaction (mol dm-3 s-1) for the following chemical reaction: CaCO3(s) + HCl(aq) CaCl2(s) + H2O(l) + CO2(g) Research question: How does altering concentration (mol dm-3) of hydrochloric acid (HCl) affect the rate of reaction (g/s) for the following reaction: CaCO3(s) + HCl(aq) CaCl2(s) + H2O(l) + CO2(g) Background information: The reaction between calcium carbonate and hydrochloric acid is an example of a neutralization reaction between an acid and a base. Neutralization reactions involve
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