4. A pesticide analysis was performed on blackberries from a local farm. To validate the analysis, a spike-and-recovery experiment was done. 100.0 µL of a 100.0 µg/mL solution of the pesticide atrazine was added to a 50.0 g sample of (dried) blackberry fruit. The concentration of malathion in the unspiked fruit, by a separate analysis, was found to be 25.0 ng/g, and the concentration of atrazine malathion in the spiked blackberry sample was 200.0 ng/g. What was the % recovery of this spike and recovery sample? You can assume that the 100.0 µL spike does not add significant mass to the spiked blackberry sample. a) 100% b) 112.5% c) 12.5% d) 87.5% e) None of these are correct

Do the calculations to determine reaction order of both HCl and Na2S2O3 based on data given

! A C Escape Chemistry 106! Type here to search Final Exam Equation Sheet.pdf: X https://docs.google.com/forms/d/e/1FAIpQLSfdH4Cb3Jih0g_TXnrExG40h2E11 NuVCU4MS9 120% The Ksp values for four salts are shown in the picture. The solubility of THREE of * the salts can be directly compared without doing any math. Arrange the three salts in order of increasing solubility. Example: If the three salts that can be compared are the first three and they are already in order of increasing solubility, enter ABC. Solid A: Solid B: Solid C: Solid D: Your answer + Try again! A₂Br3 X₂F5 Y2Cl3 Z₂F3 3.4 x 10-² 7.8 x 10-5 1.9 x 10-16 6.4 x 10-8 Ⓒ↓|||| Barium sulfite (BaSO3) is a sparingly soluble salt. You need to dissolve as much * || a W 65°F Mostly cloudy J ABP 8:28 PM 5/14/2023

Need help : Information you can use:  Volume vinegar used (mL) : 5.00 mL     % from label : 5 %     Molarity of NaOH : 0.0982 M   _____________________________________________________     Inital volume NaOH (mL) Trial 1: 0.89   Trial 2: 0.41   Trial 3 :0.57   Final volume NaOH (mL) Trial 1:43.65   Trial 2: 43.49   Trial 3: 43.09   Volume NaOH used (mL)   Trial 1: 42.76 Trial 2: 43.08 Trial 3: 42.52

Check and correct the table and equations

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A sjc.cengagenow.com OWLV2 | Online teaching [References] Use the References to access important values if needed for this ques How many milliliters of 6.86 M hydrobromic acid solution should be used to prepare 4.50 L of 0.300 M HBr? mL Submit Answer Try Another Version 1 item attempt remaining Visited

The glassware which contacts the KMnO4 solution (the filter, suction flask and storage bottle), should all be pre-rinsed with a 10% HCl solution, AND THEN FULLY RINSED WITH DISTILLED WATER (VERY IMPORTANT STEP!!! – WHY??

Based on the given tablr, which of the sample/s are non polar?