The volume of water needed to dissolve 0.0597 grams of barium chromate is ______ L. Assume no volume change upon addition of the solid.

7. During week l's lab we investigated the effect of different soaking solutions on the behavior of red blood cells. If the blood had arrived on time, our prepper would have needed to know how to make up different concentrations of saline (NaCl) solution from a 2.7% stock solution of NaCl. Can you help her by filling in the table below? For each group of students, you want to make 9ml of either 0.9% saline or 0.45% saline. Show your working out below the table you complete. 0.9 0.45 % saline solution wt/vol Volume of 2.7 2.7%wt/vol NaCl in ml Volume of distilled water in ml

out of Express your answer with three significant digits. Do not include units! g/mol A sample solution has a concentration of 12.4% by mass. What mass of solute (in g) is present in 50.0 g of this sample solution? Express your answer with three significant digits. Do not include units! g + Chemistry 20 Final Exam Equation Sheet (click to open) page 1 11

Table 4. Concentration calculations Mass of empty evaporating dish (g) 29.258 Volume of NaCl solution (mL) 10.0 Mass of dish and NaCl solution (g) Mass of dish and dry NaCl (g) Mass of NaCl solution (g) Mass of dry NaCl (g) Mass/mass percent (%) Mass/volume percent (%) Moles of NaCl (mol) Volume of NaCl solution in liters (L) Molarity of NaCl solution (mol/L) 40.498 31.164

Refer to the solubility curve below to answer this question. How many grams of NH4Cl will dissolve in 1500 g of water at 90 °C? Grams of solute per 100 g H₂O 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 K Blank 1: NH37 8 NaNO3 KCIO3. KNO3 NHẠC KCI Naci -Ce₂(SO4)3 0 0 10 20 30 40 50 60 70 80 90 100 Temperature (°C)

A student conducts an experiment. The student prepared 3 beakers which sequentially contained copper metal, zinc metal and 1M sulfuric acid solution. Which of the following statements is true…. A. Copper will dissolve to produce H2 . gas B. When the two metals are connected by a wire, the copper will dissolve C. Zinc metal will dissolve to produce H2 . gas D. Both metals will dissolve

3. Your lab space has a 100. mL bottle of 2.0 M LiAlH4. You need to make 50. mL of 0.10M LiAlH4. What volume of the original bottle should be diluted?

A scientist needs to make a 250 mL of a solution of ethanol in water that has a molaritv of 0.12 Unfortunately, the only scales are available. [Water: M = 18.02 g/mol, d=0.997 g/mL] [Ethanol: M = 46.07 g/mol, d = 0.789 g/mL]) a. Calculate the mass of each substance needed to make this solution. b. Calculated the volume percent of each substance?

Analysis of a sewage sludge sample reveals that it contains 0.025 g per Chromium. What is the concentration of Chromium in ppm and ppb? Atomic mass of  Cr=51.996 g.

* Question Completion Status: A Moving to another question will save this response. Question 17 Which of the following will dissolve best in molten KBr? OA gold O B. silver OC. benzene (C6H6) O D. water O E. Nal A Moving to another question will save this response. MacBook Prc esc こニ。 23 $4 1 2 з 4 6 Q W E tab A D F G caps lock shift fn control option command ヒ く