Q: 400 50 600 700 800 Wavelength (nm)
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A: Formula used :- RF = distance traveled by compound/distance traveled by solvent
Q: more soluble or less soluble
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Q: line of best fit. y=0.001x + 0.1987, absorbance is 1.29. Calculate the concentration of your…
A: The given line of best fit is , y = 0.001x + 0.1987 Absorbance = 1.29
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Q: What may have caused the separation of the dye components?
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A: A question based on properties of liquids that is to be accomplished.
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Q: When using cuvettes to measure the absorbance of a solution, why is it necessary to only hold the…
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Q: Chemical dyes are used to increase resolution of objects. True False
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Q: Interpret IR data
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A: As per Beer-Lambert law, A=εbc Thus, a plot between A and c is a straight line.
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A: The data is given for absorbance versus concentration of different solutions.
Q: What is the Rf value and what is the advantage of calculating Rf value? Explain.
A: To find: definition of Rf value? advantage of Rf value?
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Q: Explain why the dye spots are elongated and not round on your chromatogram.
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Q: O 40 50 Transmittance [%] 60 70 80 90 100
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A: ensure that the power absorbed was great enough to generate useful power.
Q: does a co spot on TLC plate have two Rf values?
A: co-spot in TLC
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From the experiment up what are possible reasons that make the food dyes diffuse to form distinct zones and do not immediately mix?
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- Differentiate between the dispersed phase and the continuous phase of (a) soap suds; (b) milk; (c) airborne pollen grains; (d) margarine.5. Suppose you have a mixture of water and your 2-chloro-2-methylbutane product in a separatory funnel. Use densities to predict which phase will be the top layer in the funnel. a. 2-chloro-2-methylbutane (organic phase) b. water (aqueous phase) c. there would only be one phase since the substances are miscible15. Look at the medication label. 09-9828-2000 50% Dextrose in water prefilled single-dose Syringe 50% (25 g/50 mL) Warning: Do not use unless solution is clear and seal is intact. Discard unused portion. R Practice Label Co. Practice Label This medicine has 25 grams of dextrose in 50 mL or strength. tsp of sterile water to make it be 50%
- 1. Which of the following is not a step in preparing a water sample container?a. All sample containers must be dark in colorb. The type of sample container and the level of cleaning required depend on the type of sample to be takenc. All sample containers must be thoroughly cleaned in the laboratory before sampling is carried outd. The number of containers prepared must always be in excess of what is needed, for quality assurance, quality control and reserves 2. The purpose of environmental sample analysis is..a. To determine the origin and concentration of chemicals in the environmentb. To determine the origin, concentration of chemicals and/or pollutants in the environmentc. To determine the concentration of a chemical in the environmentd. To determine the cause and concentration of pollutants in the environment5. Which tablet size and the liquid combination resulted in the fastest dissolution times? A. crushed, room temperature water B. crushed, hot water C. crushed, room temperature vinegar D. broken, hot water E. broken, room temperature vinegar 6. What is the relationship between particle size and the time it takes for the tablet to dissolve? A. direct proportion B. inverse proportion C. combined proportion D. joint proportion 7. Using the activity as a model, how does mechanical weathering (breaking or crushing) contribute to chemical weathering (dissolution)? A. Increases size of particles B. Decreases dissolution time C. Increases surface area D. Both A and B E. Both B and CTRUE OR FALSE __________ 6. Glassware is clean when no water droplets cling to the inner wall of the vessel. __________ 7. When smelling the odor of a chemical substance, fan your hand over the substance toward your nose which should be centimeters away from the substance. __________ 8. An accident as simple as breaking a beaker containing distilled water in the sink does not need to be reported to the laboratory instructor. __________ 9. Students should turn off cell phones, iPads, and other electronic devices during the laboratory class. __________ 10. It is a good laboratory protocol to call other students’ attention when they do not practice good laboratory safety procedures.
- A. FERMENTATION OF CANE SUGAR1. In a 500 mL Florence flask, place 50 gms of brown cane sugar and 1 gram ofdisodium phosphate.2. Dissolve 1 teaspoon of yeast in 15 mL of water. Add this to the sugar in the flasktogether with 150 mL water. Stir until the sugar is dissolved.3. Close the flask with a rubber stopper provided with a delivery tube so that theevolved gas will bubble through a solution of clear limewater.4. HAVE THE SET – UP CHECKED BY YOUR INSTRUCTOR.5. Keep the set – up inside the locker for 5 – 6 days at room temperature.Fermentation Set – up: ________________________________Write the equation for the hydrolysis of cane sugar _____________________________Write the equation for the fermentation of the simple sugars to alcohol __________6. At the end of the fermentation period, what is formed in the flask containinglimewater? _________________________________________________________________Write the equation for its formation ____________________________________________ C.…17.100 ml of 5:3:2 ethylene: chloroform: isoamyl alcohol 18. Convert 50 ppm to g/L 19. Convert 50 ppm to mg/L 20. Convert 5 ppb to ul/lMaterials Needed solid I2 solid CUSO4-5H20 food dye solid (NH4)2SO4 heavy metals waste container halogenated waste container non-halogenated waste container semi-micro test tubes and rack regular test tubes and rack squash pipettes acetone cyclohexane propan-2-ol Method Part A: Solubility of ionic and molecular solids 1. Place a small amount (about the size of 1 grain of rice, see picture) of copper sulfate into each of three DRY semi-micro test tubes. Add 20 drops of water to the first test tube and gently flick the test tube with your finger to ensure mixing. 2. Repeat step 1 using acetone in place of water as the solvent in the second test tube. 3. Repeat step 2 replacing acetone with cyclohexane in the third test tube. Hold the test tubes against a white background to compare the solubility of copper sulfate in the three solvents and record your results. Discard these mixtures into the heavy metals waste container in the fume cupboard. Once these test tubes have been emptied you…
- _4. Preservatives that are usually found in cured meats, bacon, ham, corned beef and hot dogs. A. Benzoates C. Sorbates В. Nitrates D. Acids 5. A type of additive that stabilizes foods through moisture control. A. Emulsifiers C. Humectants B. Flavor Enhancer D. Antioxidants 6. Additives that are usually powders added to baking mixtures which react chemically to release carbon dioxide. A. Raising Agents B. Thickeners C. Humectants D. AntioxidantsActivity 6: Water at its Best Water is one of the basic needs for a person to live. This activity allows you to explore about the properties of water by performing simple procedure at home. The following materials can be seen at your kitchen. Follow the steps and answer the guide questions stated in the activity sheet on the space provided. 1. Magic wand Materials needed: 1 small bowl Ground pepper Liquid soap Water Instructions: 1. Fill the small bowl with water 2. Sprinkle pepper onto the water (try to cover as much surface as possible) 3. Dip your finger onto the liquid soap 4. Touch the water using your finger 5. Observe what happens Guide question: 1. What property is being shown when you sprinkled pepper into the water? Discuss briefly 2. What happened when you dipped your finger with liquid soap into the water? 3. Make generalization or conclusions about the property of water that you performedDifferent type of methods used in household contaminated wastewater purification