This data below applies to questions 19 - 23. A 22.34 g sample of chromium ore consisting of impure chromium oxide, Cr203, was analyzed by treating it with hydrogen peroxide, which converted all the chromium oxide into chromate ion (CrO4²-): 2 Cr203 (s) + 3 H2O2 (aq) + 4 OH → CrO42- (aq) + 5 H20 (1) O.The solution containing the chromate ion from the sample was diluted to a volume of 0.500 L. A Beer's law plot made with a standard solution of CrO,²-, using a cell with b = 1.00 cm was found to have a slope of 2.81 L/mol (and a negligible intercept); the solution made from the ore sample showed an absorbance of 1.618 when measured in an identical cell. Using these data, calculate the answers to questions 16 - 20. (You may want to work the answers out on paper before entering them. If you use scientific notation, enter it in "calculator" format, i. e. "1.234e-5")

Your Question :help  please answer in text form with proper workings and explanation for each and every part and steps with concept and introduction no AI no copy paste remember answer must be in proper format with all working!

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During the experiment, can the crucible and lid be touched with bare hands? (Choose all correct answers) No. If the crucible is still hot, a student can burn his or her hand. Yes. Gloves can be slippery, making it more dangerous to wear them in lab. Yes. They are easier to transport to the balance room and bare hands do not introduce error into the experiment. No. Dirt and oils on hands can add to the mass of the crucible.

Find the weighted average of these values. Value Weight 5.00 75.0% 6.00 15.0% 7.00 10.0% weighted average:

A volatile liquid is one that ____________   Choose either - melts, freezes, evaporates   quickly so it transitions easily into the _______________ phase.     Choose either - solid, liquid, gas

How do you go form the stick figure to go drawing

Question 4 and 5

Which of the following statements is incorrect? *     A. Storing food inside a chemical cabinet is not allowed. B. A chemical can still be stored in a container with leaks as long as it has a proper label and cover. C. A chemical that is stored in a cabinet should be properly labeled and covered. D. A personal protective equipment should always be used in handling chemicals.       Odd one out *   A. Ingestion B. Injection C. Physical hazard D. Inhalation

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