Exp 6 - Oil Degrading Properties of Marine Bacteria

DDT (molar mass % 354.49 g/mol) was a widely used insecticide that was banned from use in the United States in 1973. This ban was brought about due to the persistence of DDT in many different ecosystems, leading to high accumulations of the substance in many birds of prey. The insecticide was shown to cause a thinning of egg shells, pushing many birds toward extinction. If a 20-L drum of DDT was spilled into a pond, resulting in a DDT concentration of 8.75 X 10-5 M, how long would it take for the levels of DDT to reach a concentration of 1.41 X 10-7 M (a level that is generally assumed safe in mammals)? Assume the decomposition of DDT is a frst-order process with a half-life of 56.0 days.

Activity 4: TANGLED CATALYSTS PROCESS Directions: The diagrams and statements below show how a catalyst speeds up this reaction but they are in the wrong order. Cut them out, then match up the statements to the diagrams so they describe what is happening. Then, stick them down in the correct order. Use arrows to indicate the sequence and a separate sheet for your output. Molecules of reactant A form bonds The product leaves the surface of the catalyst. with the active sites on the catalyst. The bonds in between the atoms of the molecule start to break. Molecules of reactant A come close to active sites on surface of the catalyst. Molecules of reactant B align itself alongside reactant A. 33 AM 1/2021 e to se Bonds between the atoms in reactant B start to break as new ones are formed between the atoms of reactant A and B. active sites De in cks

DDT (molar mass = 354.49 g/mol) was a widely used insecticide that was banned from use in the United States in 1973. This ban was brought about due to the persistence of DDT in many different ecosystems, leading to high accumulations of the substance in many birds of prey. The insecticide was shown to cause a thinning of egg shells, pushing many birds towards extinction. If a 20-L drum of DDT was spilled into a pond, resulting in a DDT concentration of 8.9 x10^-5 M, how long would it take for the levels of DDT to reach a concentration of 1.41x10^-7  M (a level that is generally assumed safe in mammals)? Assume the decomposition of DDT is a first-order process with a half-life of 56.0 days.

18) In one of your experiments, you used a Grignard reaction to make a carboxylic acid. „Br 1) Mg 2) CO2 As part of this experiment, the following procedures were given: 1. When the Grignard reaction begins to slow down, place 10 g of crushed dry ice in a 150 mL beaker. Do not take time to weigh the dry ice. Use approximately the amount in the beaker indicated by your instructor. The CO2 is in large excess and will not affect your calculation of percent yield of benzoic acid product. Cover the beaker with a watch glass. 2. When most of the magnesium has reacted and the ether boiling subsides, quickly pour the contents of the tube into the beaker containing dry ice. 3. Add a few milliliters of ether to the test tube and swirl to rinse. Add the rinse liquid to the beaker. 4. Cover the beaker with the watch glass and allow it to stand until the next lab period. During the interim, the excess dry ice will have sublimed. 5. Hydrolyze the Grignard addition product by slowing adding 30 mL of…

Write the balanced reaction that corresponds to the data in graph.

You are trying to determine the KM for an enzyme. Due to a lab mishap, you have only two usable data points: Use these data to calculate an approximate value for KM. Is this value likely to be an overestimate or an underestimate of the true value? Explain.

Which theory model restricts itself to simple one-step reactions in which two particles collide and form products? O the collision theory model O the anticipation theory model O the simple collision theory model O the pressure variation theory model 1

Retype each equation into the adjacent box. Use the XY button for superscripts and the Xy button for subscripts. Use the right and left arrow keys on your keyboard to get out of either the superscript or the subscript mode. 2Na + Cl, → 2NACI L(s) + 2e → 21-(aq)

Consider this reaction diagrams where R is reactants and P is products.   What would the reaction diagram look like if a catalyst was added?

Run Reactants Temperature (Celsius) Initial Rate (kPa/s)   1 10 ml 3% H2O2 = 5ml 0.5M KI 23.0 0.0798 2 5ml 3% H2O2 = 5ml 0.5 M KI 23.0 0.0391 3 5ml 3% H2O2 + 10ml 0.5 M KI 23.0 0.0794     Run Initial Rate (mol/L*s) [H2O2] after mixing [I-] after mixing 1 3.24 x 10^-5 0.147 M 0.0417 M 2 1.59 x 10^-5 0.0733 M 0.417 M 3 3.23 x 10^-5 0.0733 M 0.0833 M   Calculate the rate law for the reaction

Concentration (mol L-¹) COCH₂(g) Cl₂(g) + CO(g) AH = + 108 kJ 0.14 0.12- 0.10- 0.08- 0.06 0.04 0.02- 0.00+ 2 minutes 4 minutes 14 minutes 0 2 4 6 10 minutes Cl₂ Match each stress that occurred at each time using the graph CO COCI₂ 8 10 12 14 16 18 Time (min) 1. Temperature Increase 2. Pressure Increase 3. Temperature decrease 4. Remove Chlorine gas 5. Add carbon monoxide 6. Pressure decrease 7. At equilibrium 8. Remove carbon monoxide

Answer both questions at bottom

Chemistry (2023) 1 (iii)

3. A sample of glucose reacts in anaerobic respiration. The right-hand box below shows a particle diagram of the moles of substances present after the reaction is complete. On a piece of paper draw the "Before" box as shown and draw a particle diagram of the reactant molecules that produced the mixture shown on the right. Key Before = C₂H5OH = CO₂ = C6H12O6 After You will need to draw a diagram to answer this question. On a piece of paper, draw the "Before" box as shown, and then draw a particle diagram of the reactant molecules that produced the mixture shown on the right. Upload an image of your drawing by clicking "Upload files" or by dragging and dropping your file into the box. Or, use your device's camera to take a photo of your work by clicking the camera icon.

www-awn.aleks.com Significant Figures Counter Chapter 5. The Nervous System-Neurolo... https://learn-us-east-1-prod-fleet01-xyth... ALEKS Sabina Lamgadhey Learn ALEKS Sabina Lamg O CHEMICAL REACTIONS Solving for a reactant using a chemical equation Sabin Green plants use light from the Sun to drive photosynthesis. Photosynthesis is a chemical reaction in which water (H,O) and carbon dioxide (CO,) chemically react to form the simple sugar glucose (CH206) and oxygen gas (0,). What mass of simple sugar glucose is produced by the reaction of 8.45 g of water? Be sure your answer has the correct number of significant digits. x10 Explanation Check 2/2020 McGraw-Hill Education, All Rights Reserved. Tems of Use Privac 10 MacBook Air F3 F4 F5 F6 II

What can contamination of reagents leads to? Unreliable results Reliable results Reproducible results Good results Catalase is the enzyme found in potatoes and It decomposes hydrogen peroxide (H202) to form water and oxygen gas. H202 + catalase - ----> H2O + 02 +E. The reaction is maintained at temperature 40 degree Celsius and there was a formation of bubbles. Based on the enzymatic reaction given, What do you think is the substance responsible for the formation of bubbles? Oxygen gas Hydrogen gas no reaction, because the enzyme catalase will be deactivated no reaction, because the enzyme catalase will be denatured Other: Based on the Fehling's test video, do you think the sugars ribose (in RNA) and the deoxyribose (in DNA) will both form a positive result (red precipitate) No Yes

Compare the rates of change at the different points of the pH scale. a) Does adding two to a pH at one end of the scale (going from a pH of 1 to 3) have the same effect as adding two to a pH at the other end of the scale (going from a pH of 10 to 12)? Support your conclusions. b) Does doubling the pH from 2 to 4 have the same effect has doubling the pH from 5 to 10? Support your conclusions? Paragraph B I U V A/ lılı

Time (min) 0.5 1 15 2 2.5 3 4.7 [Z] (mg/mL) 1 0.66 0.5 0.4 A. 5.1 B. 7.5 C. 9.5 D. 19.5 E. 14.8 0.334 0.286 0.192 From time zero, how long (in min) will it take for the drug's concentration to drop down to 0.05 mg/ml? (Hint: While you can, you do not have to calculate Co to answer this question) Rationale (YRI Chemical Kinetics and Drug Stability: Calculations: Please refer to calculations of the variou

Q2. Carbonic Anhydrase or carbonic dehydratase is a family of metalloenzymes containing zinc (Zn) ion in its active site. Carbonic anhydrase can greatly increase the rate of this reaction, reaching a reaction rate of 104 - 106 per second. It is defined as the enzyme found in red blood cells, other parts of animals and plants, that breaks down carbonic acid with carbon dioxide and water. CO:(2) – H»O(1) – H.CO:(ag) For the carbonic anhydrase activity specified by the equation above, evaluate the standard reaction Gibbs energy at 25 °C?

Based on your ICE table (Part 2) and the definition of Ka, set up the expression for Ka in order to determine the unknown. Each reaction participant must be represented by one tile. Do not combine terms. Ka = 2.9 × 10-8 RESET [0] (0.13] [0.37] (0.010] [0.040] [0.10] [0.40] [x] [2x] [0.13 + x) [0.13-x] [0.010+x] [0.010-x] [0.040 + x] [0.040 - x] [0.10+x] [0.10-x] [0.40+x] [0.40-x] PREV 2 Based on your ICE table (Part 2) and the equilibrium expression for Ka (Part 3), determine the pH of solution. pH = RESET 0 7.3 × 10* 5.86 18.74 1.4 × 10+ 0.13 8.14 0.89