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- You are checking the accuracy of a volumetric flask marked 10.00 mL. To calculate the volume of water contained in the flask, you first measure the mass of the empty flask and the mass of the flask filled with water and take the difference. Then, you correct for the buoyancy factor and divide by the density of the water. The result of 8 such measurements is given in the table. Measurement Volume (mL) 1 10.059 2 10.050 3. 10.009 4 10.062 Calculate the mean and the 95% confidence interval for these measurements. 10.025 6. 10.019 10.049 8. 10.020 ml. 10.036 mean: 10.021 mL 95% confidence interval: + IncorrectThe air in a recently used classroom 9m x 7m x 9m tested 0.12% carbon dioxide. How many cubic meters of fresh air must be admitted per minute in order that 10 minutes later it shall contain not over 0.06% carbon dioxide. Fresh air contains 0.04% carbon dioxide. Assumeimmediate mixing of fresh with stale air. (A) 14 (B) 11 (C) 15 (D) 19 (E) 17In an experiment, sulfuric acid reacted with different volumes of sodium thiosulfate in water. A yellow precipitate was formed during the reaction. A cross drawn at the base of each flask became gradually invisible due the formation of this yellow precipitate. The time taken for the cross to become invisible was recorded. A partial record of the experiment is shown. Experimental Record Flask Volume ofH2SO4 Volume ofSodium Thiosulfate Volume ofWater Time 1 5 mL 50 mL 0 mL 19 seconds 2 5 mL 40 mL 10 mL 3 5 mL 30 mL 20 mL 4 5 mL 20 mL 30 mL Based on your knowledge of factors that affect the rates of chemical reactions, predict the trend in the last column of the experimental record. Use complete sentences to explain the trend you predicted. You do not have to determine exact values for time; just describe the trend you would expect (increase or decrease) and why it occurs.
- Based on the charles' law, the following errors in procedure will affect the experimental result. Explain how wach action causes an incorrect result. Procedure(part A) 1) Student A was in a hurry and stopped heating, even though bubbles were still emerging from the rubber tubing. 2) Student B used the measurement of Flask no. 1 to be 250mL, without measuring the volume directed. 3) Student C recorded the temperature in degrees Celcius and used these values in calculations. Procedure(part B) 4) Water remained on the outside of the flask and on the foil when the final mass was determined.An order is given to administer methylprednisolone, an anti-inflammatory drug, by IV at a rate of 44 mg every 30. min30. min. The IV bag contains 125 mg125 mg of methylprednisolone in every 2.0 mL2.0 mL. What should the flow rate be in milliliters per minute (mL/min)(a) The researchers are requested to prepare a 5.23 mol dm³ of concentration of Sodium Thiosulphate for the laboratory. The researchers have measured the concentration of the solution prepared by using the Sodium Thiosulphate Concentration Monitor. The result of the experiments is shown in Table 1. Table 1 Reading (M) Researcher Equipment Type Average 3 1 АВС-1 4.75 4.98 4.66 4.80 Y АВС-2 5.40 5.20 5.30 5.30 Z АВС-3 3.45 2.58 4.52 3.52 i. Based on the Table 1, conclude the results obtained by the researchers. ii. Define the metrology term: Error. iii. Calculate the error percentage obtained by each researchers.
- O Aktiv Chemistry KU Portal < STARTING AMOUNT https://app.101edu.co 02D2L Ch. 1 Introduction -... 62°F Morth X X + Aktiv Chemistry Connect-Bio Google Docs ADD FACTOR mol H₂ 6.022 x 1025 1.19 x 10²1 7.40 What volume in liters of H₂ gas would be produced by the complete reaction of 2.93 g of Zn solid at STP according to the following reaction? Remember 1 mol of an ideal gas has a volume of 22.7 L at STP. 2.93 LZn CG Grade Calculator ... -- Zn(s) + 2 HCl(aq) → ZnCl(aq) + H₂(g) 0.0905 g Zn Question 6 of 25 6 Search 65.38 R Point Grade Calcula... 4.35 x 10³ 0.0448 LH₂ ANSWER 22.7 2.02 2.70 x 1022 1.97 x 10- g H₂ 1 g/mol H₂ Class Search 1.02 RESET 2 S 2 mol Zn 6.12 x 1023 How t 3 g/mol ZnIdentify whenther the statement are TRUE or FALSE 1. Sedimentation time of a given particle will be zero when the density of the particle and the solvent are equal. 2. Sedimentation time depends on the shape of the particleI am allowed to work with someone I just don’t understand this Using the Volumetric Pipet Data from Part C calculate the 10. Average experimental density of the three samples of saline
- X 13. During a chemical change 0/1 bubbles of gas form. What name is given to this process? * Precipitation Effervescence Vaporization DO BubblingThe mass of a beaker is 5.333g. After 5.00mL of a concentrated hydrochloric acid solution is pipetted into the beaker, the combined mass of the beaker and the hydrochloric acid sample is 11.229g. From the data, what is the measured density of the hydrochloric acid solution?Volumetric analysis depend on which factor?