In simple distillation the thermometer bulb should be placed only a few millimeters below the side arm. Why is that so? a. In order to measure the temperature of the liquid b. In order to measure the temperature of the vapor c. In order to measure the temperature of the liquid and the vapor
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- PAPER CROMATOGRAPHY • Define chromatography • Demonstrate an understanding of the process of chromatography • Describe the steps involved in a chromatography investigation Explanation Coloured inks are often made up of several different inks. Each colour of ink will get carried a different distance by the water, allowing you to see all of the different inks. Try this with different colours to see what actually goes into a colour. This technique is called chromatography and can be used in chemistry to find out what is in an unknown mixture. II. Materials .Felt tip pens (non-washable) . Kitchen roll .A bowl or cup . Water • Scissors III. Health and safety • Make sure that you thoroughly clean any equipment after the experiment before using for food IV. Procedure Method 1 1. Take a sheet of kitchen roll and draw a simple picture with a non-washable felt tip pen. 2. Place the sheet over an empty bowl. This is to keep the paper from getting too wet. 3. Carefully add a few drops of water…What are the types of gravimetric methods? Give an examples where each method is used in an analysis. What is particulate gravimetry? When do we use this technique?1. Which of the following is not a feature of carrier gas used in gas chromatography? a.It should be suitable for the detector employed b. It should not be completely pure c.It must be chemically inert d. It should be cheap 2.Capillary columns are open tubular columns constructed from which of the following materials? a.Stainless steel b.Glass c.Fused silica d.Metal 3. Which of the following is not a desirable feature of the ovens used in gas chromatography? a.It must have a fast rate of heating b.It should have proper insulation c.Power consumption should be kept low d.It must have maximum thermal gradients 4. The GC trace obtained after an experiment is called a a.graph b.chromatogram c.chromatograph d.chromatophore 5. What useful information can be found from a Van Deemter plot? Select one: a. Optimum mobile phase flow rate b. Optimum column length c. Optimum column temperature 6. Which of these effects result from slow…
- Filtration of samples A, B, and C show no residue left. After letting them dry in different beakers, SAmple A remains no residues. Sample B shows crystal leftovers, and sample C show brown film on the beaker walls. This means that: a. Two or more samples are heterogenous b. Two or more samples are homogenous c. all sample have 2 or more phases d. all samples are pureHow does the fractionating column make distillation more precise? A. The added distance gives more leeway for expanding gases so as not to explode. B. The added distance increases temperature of all vapors involved C. The added distance from the condenser forces heavier vapors to condense off early D. The added distance lets the thermometer get a more stable temperatureWhich technique separates components of amixture with different boiling points? A. filtration D. chromatographyB. distillation E. sublimationC. crystallization
- why is a fractionating column better able to separate liquids?When measuring iron in river water by spectrophotometry using the ferrozine reaction that is described in the class notes, a student finds that they cannot distinguish their samples from noise (i.e. they are below the limit of detection) when they use a 1-cm cuvette. The student makes the decision to use a 5-cm cuvette in their method instead. a) By how much should the student expect their sample measurements to increase by? Why? b) Will their reagent blank also increase by the same amount? Why or why not? 3.17. A stat chemistry test is requested. Which of the following tubes is recommended to use? * O A. Serum separator tube O B. Red top tube with silicon O C. Orange top tube O D. Royal blue top tube 18. Which of the following is not correct about the evacuated tube 1 p system?* O A. Multiple collection of blood B. Closed system O C. Most common means of blood sampling D. Minimal risk of contamination
- The most convenient method of determining specific gravity of solids heavier than and insoluble water in one piece is the use of Select one: a. pycnometer b. Lovi's beads c. hydrostatic balance d. Fisher-Davidson Gravitometer Glass measure are preferred for measuring liquids because Select one: a. all these b. it is easy to handle c. of its coefficient of expansion d. transparency of the glass can more accurately indicate volume It is accurate to use measuring device calibrated in the US system in measuring quantities directed in the English prescriptions? Select one: a. False b. True23. Use dimensional analysisa. analytical balanceb. top-loading balancec. serological pipetted. graduated cylindere. burettef. volumetric flaskg. Erlenmeyer flaskh. beaker3. Based on the measurement uncertainty of the above instruments, which instruments would yieldthe lowest percent error?