q:8 to 10 QUESTION 8 Which of the following statements concerning electrolytes a

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q:8 to 10

QUESTION 8 Which of the following statements concerning electrolytes and nonelectrolytes is/are true? 1. Some molecular substances are electrolytes 2. All electrolytes are ionic substances. 3. Strong electrolytes partially ionize in solution o a.I only o b.2 only c, 3 only d. 1 and 3 e, 2 and 3 QUESTION 9 Which of the following compounds is soluble in water? O a.Cs2S e c. Sc203 e. Cos QUESTION 10 A precipitate will form when aqueous Pb(NO3)2 is added to an aqueous solution of a . Nal .NaCH3CO2 o d. KNO3 e.Cu(NO3)2 QUESTION 11 is the net ionic equation for the reaction of aqueous sodium hydroxide a. Na+(aa) + Cr(aq)-. NaCl(s) What and aqueous iron(1I) chloride? Click Save and Submit t o sove and submít. Click Sqve All Answers to sve all a webapps/assossment/take/launch.jsp?course assessment id-_1124806 1&cours;

Explanation / Answer

8. OPTION b. Molecular solids or liquids are composed of the same molecules in their pristine states and do not have them ionized in their true phases. Thus they cannot be considered as electrolytes. Strong electrolytes are considered as ionic substances which completely, not partially ionize in solution. Weak electrolytes are those which undergo partial ionization in solution. All electrolytes however are indeed composed of ionic substances as it is this permanent charge separation in electrolytes that enable them to conduct electricity by migration of ions.

9. OPTION c. All of the given compounds except selenium trioxide are sulfides and low valent transition metal chloride whose bonds are much more covalent than ionic due to the simiarity in their sizes and electronegativities making them nearly non-polar thus insoluble in the polar solvent water. Selenium trioxide on the other hand behaves similar to sulfur trioxide and has large electronegativity difference between Se and O and thus is very polar. This makes it freely soluble in water.

10. OPTION a. When lead nitrate is added to a solution of sodium iodide, the resulting double displacement reaction gives sodium nitrate and lead iodide as products of which due to largely covalent character of the Pb-I bond, the latter is insoluble in water arriving as a precipitate.

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