Which of the following substances presents the greatest health hazard in the lab

Question

Which of the following substances presents the greatest health hazard in the laboratory A. ethanol B. glycine C. lead acetate D. cysteine Approximately how much 0.1 M NaOH would be required to raise the pH of water from pH 10.0? A. 15.0 mL B. 10.0 mL C. 5.0 mL D. 1.0 mL Which solution would require the largest volume of 0.1M HCI to decrease the pH A. water at pH 4.0 B. water at pH 7.0 C. acetate buffer at pH 4.0 D. acetate buffer at pH 7.0 The lead acetate protein test shows a positive reaction to which of the following amine A. glycine B. cysteine C. isoleucine C. cysteine D. all of the above Beer's Law states that absorbance is proportional to___. A. concentration B. wavelength C. frequency D. time The purpose of the Bradford reagent in the quantitative analysis of proteins is to___. A. dissolve the protein in solution B. bind with the protein so that it absorbs visible radiation C. degrade the protein into amino acids D. calibrate the uv-vis spectrometer

Explanation / Answer

9.cystein. lead acetate reacts with sulfur containing aminoacids.

10.according to beers law proportional to concentration. as the concentration increases the absorbance increases

11. the purpose of bradfords reagent is to bind with the protein so that it absorb visible radiation

12. most accuarte way is using 10 ml graduated cylnder. because even the pipet sometimes fail to measure accurately.

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