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.

Review I Constants i Perlodic Table As a food chemist for a major potato chip company, you are responsible for determining the salt content of new potato chip products for the packaging label. The potato chips are seasoned with table salt, NaCl. You weigh out a handful of the chips, boil them in water to extract the salt, and then filter the boiled chips to remove the soggy chip pieces. You then analyze the chip filtrate for Cl- concentration using the Mohr method.First you prepare a solution of silver nitrate, AGNO3, and titrate it against 0.500 g of KCl using the Mohr method. You find that it takes 64.5 mL of AgNO3 titrant to reach the equivalence point of the reaction. You then use the same silver nitrate solution to analyze the chip filtrate in a Mohr reaction, finding that the solution yields a rusty brown precipitate when 45.4 mL of titrant is added. Part A If the sample of chips used to make the filtrate weighed 76.5 g , how much NaCl is present in one serving (105 g ) of chips?…

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

How was Thin Layer Chromatography (TLC) used in organic synthesis reactions ? TLC is used to find the exact concentration of a catalyst in the reaction. TLC can speed up a reaction because silica gel is polar. TLC can separate components of a reaction mixture such as starting materials and products allowing the experimenter to identify what compounds are in the reaction mixture. TLC is used to find percentage yield of the reaction.

Lab 6: Chemical Reactions Post-Lab Questions Station V: Heating Cu with Atmospheric O₂ Chemical equation: Complete ionic equation: Net ionic equation: General reaction type: Station VI: Reacting CuSO4 Solution with Steel Wool (Fe)

ACTIVITY 1 APPEAR OR DISAPPEAR

Which of the following chemical kinetic (reaction rates) factors in biological systems results in a more efficient system? Group of answer choices Decreased activation energy. Large cell size. Liquid state of cells. Solid state of cells. Lower body temperature.

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…

this is my homework practice assignment that is very important and I really need help please give the answer for the 2 questions which I have highlighted with the green color I need a step by step explanation please please please help me.

Resarch project ( le chatelier's principle ) Be sure to explain the Chemistry involved in this reaction or process and how this reaction relates to Technology, Society and/or the Environment. Some examples include: Haber-Bosch Process Blood Buffering Ocean Acidification add lots of pictures and details

Use the References to access important values if needed for this question. Write the Ksp expression for the sparingly soluble compound calcium phosphate, Ca3 (PO4)2. (If either the numerator or denominator is 1, please enter 1.) Ksp Submit Answer Retry Entire Group 9 more group attempts remaining Previous Next

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)

Name (please print): Fall 2022 Basic Laboratory Operations Post Lab Questions 1.) Suppose you're attempting to measure the density of a liquid that is highly volatile (it evaporates quickly). If you first measure the mass and then several minutes later you measure the volume of the liquid will the measured density be higher than the true value, lower than the true value, or the true density of the liquid. [It helps to understand this problem with the density equation.] 2.) Suppose you're attempting to measure the density of a liquid that is highly volatile (it evaporates quickly). If you first measure the volume and then several minutes later you measure the mass of the liquid will the measured density be higher than the true value, lower than the true value, or the true density of the liquid. [It helps to understand this problem with the density equation.] 3.) You're attempting to calculate the density of an alloy. The alloy is in the shape of a cylinder. If the mass of the alloy is…

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

please box answers

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

1. A daily low dosage of aspirin (acetylsalicylic acid) can lower the risk of heart attack and stroke for individuals at risk. Aspirin suppresses the generation of prostaglandins by irreversible binding to the enzyme COX-1. Inhibition of prostaglandin synthesis lowers the production of thromboxanes that are responsible for the aggregation of platelets and the formation of blood clots. You will explore the mechanism of aspirin binding. 1.1 The average pH of the human body is 7.4 (also known as a physiological pH). Draw the structure of aspirin at a physiological pH. OH 1.2 Aspirin reacts with the amino acid Serine. What is the structure of serine? Draw the structure of the tripeptide Ala-Ser-Trp (draw these structures as they exist at physiological pH) serine Ala-Ser-Trp 1.3 Aspirin reacts with Serine 530 of COX-1 by transesterification reaction. Draw a general mechanism of acid-catalyzed transesterification reaction. Use HA as an acid. 1.4 Draw an arrow-pushing mechanism for the…

(NH4)2CO3(s) 22 NH3(g) + CO2(g) + H2O(g) [(NH4)½CO3] [NH3] [CO2] [H2O] [H2O] [(NH4)2CO3] K. = [NH3] [CO2] Build the equilibrium constant expression for the reaction shown. Step 1. Drag the reactants and products to the numerator or denominator as appropriate. Click a species to remove it from the expression. Step 2. Drag the coefficients to the appropriate species. Click a coefficient to remove it from the expression. Recheck Next (5 of 8) 1?nd attemnt

According to the Arrhenius equation, what does the slope of the line on this graph represent? In(k) vs 1/T -5 -50200315 0.002 0.00325 0.0033 0.00335 0.0034 -5.4 + -5.6 y = -9253x + 24.504 25.8 -6 -6.2 -6.4 -6.6 -6.8 1/T a) 24.504 Ea b) -9253 = LnA c) -9253 -Ea d) -9253-Ea/R =

Which of the following is an example of a catalyst?   dNTP's used as building blocks for a new DNA strand synthesized in a PCR reaction. Enzymes in your saliva that increase the rate of the breakdown of food molecules A compound that is produced in the final step of a reaction mechanism, and appears as a product in the net reaction. Phenolphthalein indicator used in acid/base titrations. Carbon dioxide in a combustion reaction, such as the burning of biodiesel.     Next

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

From the activity, answer guide number 5.

Does the diagram show exothermic or endothermic reaction

Acid Rain Formation Acid Rain S02 NOX

Resarch project( le chatelier's principle ) Be sure to explain the Chemistry involved in this reaction or process and how this reaction relates to Technology, Society and/or the Environment. Some examples include: Haber-Bosch Process Blood Buffering add lots of pictures and details

PLACE THE GIVEN, UNKNOWN, AND FORMULA TO USE.COMPUTE USING 3  SIGNIFICANT FIGURES FOR EACH STEP AND FOR THE FINAL  ANSWER.

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