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If at the end of an experiment it is found that the bottle where laboratory waste must be placed is empty, what could be concluded?
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- A sample was placed on a chromatography column. Dichloromethane was used as the eluting solvent. All the components were eluted off the column, but no separation was observed. What must have been happening during this experiment? How would you change the experiment to overcome this problem?Explain what Avery’s experiment showed in 1944. Briefly describe the idea behind the experimental set up. Mention the step by step findings and the conclusions.List down two important precautions in conducting brine solution experiment.
- State what is the miller-urey experiment, when was it done and describe how it works.Determine the function of chemicals listed in Experiment.Choose one of the three experiments performed by (1) Griffith, (2) Avery, McLeod, McCarty, (3) Chase, and Hershey. Explain the problem being solved, how the experiment was conducted, and how impactful the results have become
- When one uses Benedict’s reagent added to UNKNOWN samples taken and added (as a liquid) by a pipette (in our homes we call them eye-droppers) from each container into a labeled by number test tube. The seven labeled test tubes are then immersed into a beaker on a hot plate with warm water in it (called a water bath): Samples : ONE, TWO, THREE, FOUR, FIVE, SIX, SEVEN All seven UNKNOWNS having Benedicts reagent added to them then change from transparent clear after to the same color as the Benedict’s reagent, when the blue colored reagent is added to them. They are all (all seven unknowns) now blue in color. Then the seven test tubes are immersed in a warm water bath. What is seen by you is that NO color change occurs initially when they are all immersed in warm water. THEN, over a five to ten-minute window of time as you watch the unknown test tube containing samples in the warm water bath, the test tubes containing unknowns ONE and FOUR change in color, to your eyes, to an identified…Before the experiment was run, the apparatus was sterilized and then carefully sealed. Why was this an important thing to do?explain the results of this experiment and the purpose
- Why are controls needed when conducting scientific experiments?What happens if initial temperature is not recorded in the experimentExplain why dichloromethane is a good solvent to remove the fat from the milk? Can you use organic solvent like ethanol to replace dichloromethane in this experiment? Experiment: Quantitative analysis of biological sample ingredients (Milk Analysis)