Adsorption

Question 1

concentration of a substance on the surface of a solid or a liquid

Answer 1

adsorption

Question 2

substance attracted to a surface

Answer 2

absorbate phase

Question 3

substance to which it is attached

Answer 3

absorbent

Question 4

factors that determined the amt of gas adsorbed by a solid

Answer 4

1. nature of adsorbent and gas na inaabsorbed by a solid
2. area of absorbent
3. temperature of the gas
4. pressure of the gas

Question 5

Types of adsorption

Answer 5

1. physical or van der waal’s adsorption
2. chemical or activated adsorption or chemisorption

Question 6

occurs when the intermolecular
forces of attraction between the fluid molecules and the solid surface are greater than the attractive forces between molecules of the fluid itself.

Answer 6

Physical or Van Der Waal’s Adsorption

Question 7

Fluid molecules adhere to the surface of the solid adsorbent. The forces responsible for the adsorption are of the same fluid as are involved in the deviation of gases ideal behavior and in liquefaction, i.e. Van der Waal’s forces.

-characterized by low heats of adsorption.

Answer 7

Physical or Van Der Waal’s Adsorption

Question 8

involves chemical interaction between the adsorbed fluid and the adsorbent solid.

Answer 8

Chemical or Activated Adsorption or Chemisorption

Question 9

The adsorption is irreversible and it is difficult to separate the adsorbate from the adsorbent. Hence, only physical adsorption tends itself to continuous stage-wise operations.

Answer 9

Chemical or Activated Adsorption or Chemisorption

Question 10

The ____________________ relates the concentration of the adsorbate in the solution and the adsorbate on the adsorbent at equilibrium at a given temperature.

Answer 10

Freundlich Isotherm

Question 11

this has binding site where particles come in and there is chemical reaction

Answer 11

chemical adsorption

Question 12

Freundlich Equation applies to adsorption of solute from

Answer 12

dilute solutions, over a small concentration range

Question 13

In case of physical adsorption, the difference between heat of adsorption and heat of normal condensation is

Answer 13

equal to the heat of wetting

Question 14

CO2 can be adsorbed by

Answer 14

heated charcoal

Question 15

lon exchange process is similar to

Answer 15

adsorption

Question 16

As complete saturation of an adsorbent is approached, the differential heat of
adsorption approaches

Answer 16

heat of normal condensation

Question 17

The change in enthalpy when a unit quantity of gas is adsorbed by a relatively large quantity of adsorbent (on which a definite concentration of the adsorbed gas already exists) is termed as the

Answer 17

differential heat of adsorption

Question 18

With an increase in concentration of the adsorbate the integral heat of adsorption

Answer 18

decreases

Question 19

The change in enthalpy per unit weight of adsorbed gas when adsorbed on a gas-free or “outgassed” adsorbent to form a definite concentration of adsorbate is called its

Answer 19

integral heat of adsorption

Question 20

In physical adsorption, a gas of

Answer 20

higher molecular weight is adsorbed in preference to a gas of low molecular weight

Question 21

In physical adsorption, a gas of (pick the wrong)

Answer 21

high critical temperature (this is prolly correct) is adsorbed in preference to a gas of law critical (wrong?) temperature

low volatility is adsorbed in preference to a gas of high volatility

Question 22

Which of the following adsorbents is used to decolorize yellow glycerine?

Answer 22

activated carbon

Question 23

When adsorption hysteresis is observed, the desorption equilibrium pressure is

Answer 23

always lower than that obtained by adsorption

Question 24

Chemisorption (chemical adsorption) is

Answer 24

also called activated adsorption

Question 25

Physical adsorption is

Answer 25

accompanied by evolution of heat a reversible phenomenon

Question 26

A unit operation wherein specific components s of a fluid phase (gas or liquid) are preferentially adhered to the surfaces of the solid

Answer 26

adsorption

Question 27

The adsorbent used in the purification of hydrocarbon products

Answer 27

silica gel

Question 28

The component adsorbed in adsorption operation is called

Answer 28

adsorbate

Question 29

A type of adsorption which results in intermolecular forces of attraction between molecules of the solid and the substance adsorbed.

Answer 29

physical adsorption