(a)
Interpretation:
Nanoscale diagram for the contents of a beaker containing water and ethanol has to be drawn.
Concept introduction:
Like dissolves like principle: ‘Like dissolves like’ principle says that polar compounds including ionic compound should be more soluble in polar solvent. Likewise, non–polar compound should be more soluble in non–polar solvent.
Polar molecule: Polar molecules have large dipole moments.
Non-Polar molecules: Non-polar molecules have bonded atoms with similar electronegativity results to have zero dipole moments.
Solubility is the quantity of solute (solid, liquid or gas) that will dissolve in a given amount of solvent (solid, liquid or gas) at definite temperature and pressure. Solubility depends on the physical and chemical property of solvent, solute and concentration of the solution.
(b)
Interpretation:
Nanoscale diagram for the contents of a beaker containing Carbon tetrachloride and water has to be drawn.
Concept introduction:
Like dissolves like principle: ‘Like dissolves like’ principle says that polar compounds including ionic compound should be more soluble in polar solvent. Likewise, non–polar compound should be more soluble in non–polar solvent.
Polar molecule: Polar molecules have large dipole moments.
Non-Polar molecules: Non-polar molecules have bonded atoms with similar electronegativity results to have zero dipole moments.
Solubility is the quantity of solute (solid, liquid or gas) that will dissolve in a given amount of solvent (solid, liquid or gas) at definite temperature and pressure. Solubility depends on the physical and chemical property of solvent, solute and concentration of the solution.
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OWLv2 for Moore/Stanitski's Chemistry: The Molecular Science, 5th Edition, [Instant Access], 1 term (6 months)
- 12. (b) A student knew that calcium hydroxide could be made by adding calcium to water. The student added 0.00131 mol of calcium to a beaker containing about 100 cm of water. A reaction took place as shown by the equation below, All the calcium hydroxide formed was soluble. Ca(s) + 2H,0(1I) → Ca(OH) (aq) + H,(g) (D Calculate the mass of calcium that the student added. mass of calcium = g (ii) Calculate the volume of hydrogen gas, in dm3, produced in this reaction at room temperature and pressure, RTP. volume of hydrogen gas = dm3 (iii) The student transferred the contents of the beaker to a 250 cm3 volumetric flask and water was added to make the solution up to 250 cm³. Calculate the concentration, in mol dm3, of hydroxide ions in the 250 cm³ solution. concentration = moldm 3arrow_forward(1) To analyze the concentration of chloroform precursors, or natural organic matter, in a drinking water sample, which of the following instruments should be used? (A) TOC analyzer (B) GC (C) AA (D) IC (2) To analyze the concentration of cadmium (Cd) in a water sample, which of the following instruments should be used? (A) TOC analyzer (B) GC (C) AA (D) LC (3) To analyze the concentration of the chlorine residual in a water sample, which of the following instruments should be used? (A) TOC analyzer (B) GC (C) AA (C) AA (D) IC (4) To identify an unknown organic compound in drinking water, which of the following instruments should be used? (A) TOC analyzer (B) GC (D) IC (E) DPD Method (C) conductivity (E) GC/MS (5) To evaluate the quality of a drinking water sample, which of the following parameters may NOT be tested? (A) TSS (B) turbidity (D) TOC (E) coliformsarrow_forwardNext the calcium hydroxide reacts with magnesium ions, Mg2 (aq) in the seawater to produce magnesium hydroxide and calcium ions. (c) Write the word equation and the balanced chemical equation. (d) Identify the type of chemical reaction.arrow_forward
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- 12. A 6.35 gram sample of a mixture containing sodium carbonate is found to react completely with 75.0 mL of 1.25 M hydrochloric acid. The other components of the mixture did not react. The products of the reaction between the sodium carbonate and hydrochloric acid were sodium chloride, carbon dioxide, and water. (a) What was the percent by mass of sodium carbonate in the original mixture? (b) How many liters of carbon dioxide would have been generated if it had been collected at STP?arrow_forwardWrite a balanced chemical equation for each of the following decomposition reactions: (a) Magnesium carbonate decomposes on heating. (b) Copper(I) carbonate decomposes on heating.arrow_forwardIf 16.0 mL of water are added to 31.5 mL of 0.586 M Ba(OH)2Ba(OH)2 (aq), what is the new solution molarity?arrow_forward
- For the chemical equation 2HBr (aq) + Ba(OH)2 (aq) yields to 2H2O (L) + BaBr2 (aq) write the net ionic equation, including the phases.arrow_forwardGiven the 250 mL of 0.400 M Co(NO3)2 shown above, prepare 200. mL of 0.0900 M Co(NO3)2 solution. (a) Do the calculations required and report the answer. (b) Describe the specific steps to perform this dilution, being careful to mention amounts of chemicals and specific glassware needed so that anyone can make this solution using only your instructions.arrow_forwardConsider a solution prepared by adding 2.70 g acetic acid, CH3CO2H, to 122.8 g of H2O. (a) what is the percent by mass concentration of acetic acid in the solution? (b) what mass of acetic acid is present in 25.0 g of this solution?arrow_forward
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