(ii) A sample of 3.25 cm³ of bromine vapour leaks into a laboratory. Calculate the minimum volume, in dm³, of the laboratory for the resulting concentration of bromine to be at a safe level.

Write the formula for a micelle of a sol of barium sulfate, obtained by the exchange reaction between barium nitrate and potassium sulfate in the case of an excess of barium nitrate.

A volume of 125.0 mL of 0.565 M KOH (aq) is diluted with 425.0 mL of pure water.  What is the final concentration (in molarity) of KOH? Report to three significant figures.

Distinguish between water quality and hydrochemistry.

I need some assistance.

In Module #4, we discussed the role of chlorofluorocarbons (CFCs) in catalyzing the destruction of O3 in the stratosphere. One example of a CFC that is known to exasperate formation of the hole in the O3 layer is dichlorodifluoromethane (CF2Cl2). In the year 2000, this chemical reached its peak concentration of 2.2 x 10-11 M in the atmosphere. The destruction of CF2Cl2 can be approximated as a first-order process and the 1996 treaty on CFC emissions has eliminated its release into the atmosphere. Given that the rate constant for destruction of CF2Cl2 in the atmosphere is 0.009 yr-1, how long will it take for the concentration of CF2Cl2 to decline to 0.22 x 10-11 M?

One method of analyzing amino acids is the van Slyke method. The characteristic amino groups (−NH2) in protein material are allowed to react with nitrous acid, HNO2, to form N2 gas. From the volume of the gas, theamount of amino acid can be determined. A 0.0604-g sample of a biological sample containing glycine, CH2(NH2)COOH, was analyzed by the van Slyke method and yielded 3.70 mL of N2 collected over water at a pressure of 735 torr and 29 °C. What was the percentage of glycine in the sample?CH2(NH2)CO2 H+HNO2 ⟶CH2 (OH)CO2 H+H2O+N2

31.  10.0 mL. of concentrated of H3PO4(aq) is diluted to the final volume of 250.0 mL.  Then 15.0 mL. of the diluted  H3PO4(aq) is titrated with 0.0455 M NaOH(aq) that one of the product is Na2HPO4(aq).  It takes 24.35 mL. NaOH(aq) to complete the reaction.  Calculate molarity of H3PO4(aq) in the concentrated solution.     a.0.132 Mb.3.00 Mc.0.923 Md.1.85 M

31.  10.0 mL. of concentrated of H3PO4(aq) is diluted to the final volume of 250.0 mL.  Then 15.0 mL. of the diluted  H3PO4(aq) is titrated with 0.0455 M NaOH(aq) that one of the product is Na2HPO4(aq).  It takes 24.35 mL. NaOH(aq) to complete the reaction.  Calculate molarity of H3PO4(aq) in the concentrated solution.     Group of answer choices a.0.923 M b.1.85 M c.3.00 M d.0.132 M

A chemical reaction occurred when 500 mL of 7.5 x 104M Cal2 and 100 mL of 1.7 x 105M Pb(NO3)2 solutions were mixed at 25.0°C. Ksp = 1.4 x 108 а. Write out the complete chemical reaction that occurs when the calcium iodide is mixed with lead(II)nitrate. The equation must be balanced, and the states of matter need to be shown. b. Determine whether a precipitate will form. If the temperature at which the substances were mixed was lowered to -25.0°C, do you С. think that could impact your answer given in part b? Explain your answer using your knowledge about equilibrium. Assume the volumes and concentrations were not impacted by the temperature change.