1) Which of the following liquids would have the highest viscosity at 25degC A)

Question

1) Which of the following liquids would have the highest viscosity at 25degC

A) CH3OCH3, B) CH3CL2, C) C2H5OH, D) CH3Br E) HOCH2CH2OH

2) What is the molaity of Ci^-1 ions in 5.621% by mass CaCl2(aq)? The molar mass of calcium chloride is 110.98g/mol

3) Which of the following liquids are likely to be miscible with water :1-proponal (CH3CH2CH2CH), Carbon tetracholride(CCl4) hexane (C6H14), and acetic acid (CH3CO2H)?

4) In which solvent should K^+ have the most negative enthalpy of solution?

a) CC4 b) H2O, c) C6H6 d) CS2 e)CH3OCH3

5) Which substance will likely NOT quantitatively follow Henry's law when dissolved in water?

a) He b) O2 c)CH4 d)N2 e)NH3

6) Which of the following aqueous solutions has the highest boiling point? Kb for water is 0.52degC.

a) 0.2mKCl b) 0.2mNaSO4 c)0.2mCa(NO3)2, d) 0.2mKCl AND 2MNa2SO4, e) 0.2mNaSO4 AND 0.2mCa(NO3)2.

7) The solubility of gases in water usually increases with?

Explanation / Answer

1) answer : E) HOCH2CH2OH

it can form hydrogen bonds thats why it is having highest viscosity.

C2H5OH can also form hydogen bond . the extension of hydrogen bonds more in HOCH2CH2OH then C2H5OH. so ethylene glycol has highest viscosity.

2) weight = 5.621 g

molar mass = 110.98 g/mol

molarity = ( weight/molar mass ) x1/V(lit)

               =( 5.621/110.98) x 1/1

              =0.0506M

CaCl2 molarity = 0.0506 M

Cl- molarity = 2 x 0.0506

                   =0.101 M

3) 1-propanal and acetic acid (CH3COOH) misible in water. becausethey form hydrogen bonds.

4) answer b) H2O

K+ violently react with water release more amount of heat . in remaining all sovents K+ doesnot dissolve because they are all organic non-polar

5) answer : c)CH4

CH4 doesnot dissolve in water . so henry law is not applicable.

henry law: solubility of gas directly proportional to concentration

6) answer : d) 0.2mKCl AND 2MNa2SO4

bolining point increse with increase in number of ions and concentration

7) The solubility of gases in water usually increases with increasing in pressure.

pressure of gas increse and temperature decreses solubilty increases.

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