Describe the process by which a polar solvent dissolves an ionic substance. Explain why cations in aqueous solutions are attracted to the oxygens of water molecules and why anions are attracted to the hydrogens of water molecules. What are the characteristics of water? Is it polar? Why are al...
This research investigates the efficacy of a novel microwave-assisted bionanomaterial derived from Calotropis procera stem, an abundant and eco-friendly adsorbent, for removing arsenite ions from aqueous solutions. Surface properties of Bionanomaterial was Characterised using Scanning Electron Microscopy (SEM...
Explain why cations in aqueous solutions are attracted to the oxygens of water molecules and why anions are attracted to the hydrogens of water molecules. Why does water evaporate at all? Describe two physical properties and two uses or applications of H2O. Explain how polarity and s...
What term is used to describe the exclusion of nonpolar substances from an aqueous solution? a) nonpolar effect b) lipid effect c) hydrophobic effect d) oil droplet effect e) amphiphilic effect Is the compound NH4Br soluble in water? Explain. Describe how to make 2.5 L of 0.1 M HCl s...
You need to make an aqueous solution of 0.216 M barium iodide for an experiment using a 300 mL volumetric flask. How much solid barium iodide should you add (in grams)? What is the molar mass of ammonia? A salt contains only barium and one of the halide ions. A 0.158 g sample of ...
Catalytic reduction of CO2 over Cu-based catalysts can produce various carbon-based products such as the critical intermediate CO, yet significant challenges remain in shedding light on the underlying mechanisms. Here, we develop a modified triple-stage
For immunogold staining, 100 nm ultra-thin sections were mounted on nickel grids and etched in 10% aqueous H2O2 for 10 minutes at room temperature. After blocking, sections were incubated with the primary antibodies overnight at 4°C, washed and transferred to a solution containing secondary ...
What is the pOH of an aqueous solution of 0.531 M hydrocyanic acid? A 0.10M HF solution is 8.4% ionized. Calculate the H+ ion concentration. Calculate the pH of a 0.80 M aqueous solution of NaF (K_a for HF = 7.2 times 10^-4). What is the molarity of a solution containing 0.325...
Why does the brownish color of an aqueous elemental iodine solution disappear when a few crystals of Na_2S_2O_3 are added to it? Why do transition elements form colored compounds? Explain why you would or would not expect to observe a color change if F e C l 3 were added to the fol...
Would you expect silver nitrate to react with sodium chloride? Why or why not? Write the net ionic equation. And why do double replacement reactions in aqueous solutions occur faster than single replacement reactions between a ...