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Quiz for CHEM 242 - LAB

Total questions: 15

Worksheet time: 4hrs 45mins

Name
Class
Date
1.

The solubility of two partially miscible liquid of phenol-water system is depends on two factors :.............&............

a)

Temperature & Pressure

b)

Volume & Pressure

c)

Temperature & Concentration of phenol in water

2.

...............is defined as that particular ratio of components in a mixture that has the lowest freezing point.

a)

Critical point

b)

Eutectic point

c)

Boiling point

3.

In phenol-water system,If the %composition of phenol at critical temperature is 33%

The % composition of water at critical temperature is ...........

a)

67%

b)

0.33%

c)

70%

4.

To convert the molar concentration (mol/L) to unit (g/L) by multiplying in ..................

a)

number of moles (n)

b)

103

c)

Molecular Weight (M.wt)

5.

For Ternary system,we have three components. If the system consists of only one phase,The degree of freedom F=

a)

2

b)

4

c)

5

6.

The liquids are completely dissolve in each other to form homogeneous solution called ................

a)

Immiscible liquids

b)

miscible liquids

c)

partially miscible liquids

7.

TO be able to use the distribution coefficient law, the substance should be soluble in two immiscible liquid?

a)

True

b)

False

8.

Plot a graph of %phenol against miscibility temperature.The graph is .................

a)

Triangular

b)

Straight line

c)

bell-shaped

9.

If distribution coefficient smaller than one (D<1),This mean that concentration of substance in aqueous layer ............... than concentration in organic layer.

a)

smaller

b)

greater

c)

equal

10.

In the first-order reaction,we determine the rate constant by plotting the relation between ln[A] and " t " and slope should be equal ..............

a)

K

b)

-K

c)

1/K

11.

Hydrolysis of ethyl acetate in acidic solution produces two product are .............&..........

a)

CH3COOH + CH3CH2OH

b)

CH3COOH + H2O

c)

H2O + CH3CH2OH

12.

What is the half life (t1/2)of N2O5 if it decomposes with a rate constant of 5.7X10-4 S-1 ?

a)

8.22X10-4 Sec

b)

1216.05 Sec

c)

1121.05 Sec

13.

Derive Integrated rate equation for first-order reaction ?

a)

-

b)

-

c)

-

14.

Solve this question on paper

a)

-

b)

-

c)

-

15.

Solve this question on paper

a)

-

b)

-

c)

-