Lesson 1

Question 1

this is the proportionality constant of Fick’s law

Answer 1

diffusivity/diffusion coefficient

Question 2

it is the net movement of mass from one location to another

Answer 2

mass transfer

Question 3

it is the transfer of mass by diffusion occurs due to the presence of concentration gradient in a mixture (ordinary dffusion)

Answer 3

diffusion mass transfer

Question 4

unit operations: volatile liquids, usually water, are removed from solid materials

Answer 4

drying

Question 5

it is the transport of materials between a moving fluid and a surface or between two relatively immiscible, moving fluids

Answer 5

convective mass transfer

Question 6

this type of diffusion is due to random, individual movement of molecules

Answer 6

molecular diffusion/random-walk process

Question 7

unit operations: components of a liquid mixture are separated by boiling because of their differences in vapor pressure

Answer 7

distillation

Question 8

dependent on P, T, and composition of the system

Answer 8

diffusivity/diffusion coefficient

Question 9

this type of diffusion is due to adding bulk flow to diffusion

Answer 9

turbulent diffusion/eddy diffusion

Question 10

unit operations: evaporation of a volatile solvent from nonvolatile solute

Answer 10

evaporation

Question 11

mode of mass transfer which is the slower one

Answer 11

diffusion mass transfer

Question 12

involve processes which do not involve any chemical reaction

Answer 12

unit operations

Question 13

5 examples of unit processes

Answer 13

bromination
reduction
oxidation
sulphonation
hydrolysis

Question 14

this is a vector quantity denoting the amount of the particular species, in either mass or molar units, that passes per given increment of time through a unit area normal to the vector

Answer 14

molal/mass flux

Question 15

what law does mass transfer use?

Answer 15

fick’s law

Question 16

involve processes in which chemical changes take place

Answer 16

unit processes

Question 17

what is the movement of mass in mass transfer?

Answer 17

from high to low concentration

Question 18

unit operations: removal of a solute such as salt from a solution by precipitating the solute from the solution

Answer 18

crystallization

Question 19

what are the 2 modes of mass transfer?

Answer 19

1. diffusion mass transfer
2. convective mass transfer

Question 20

whar are the 3 fundamental transport processes

Answer 20

momentum transfer
heat transfer
mass transfer

Question 21

mode of mass transfer which is the faster one

Answer 21

convective mass transfer

Question 22

what law does heat transfer use?

Answer 22

fourier’s law

Question 23

5 exampes of unit operations

Answer 23

distillation
evaporation
adsorption
drying
absorption

Question 24

two types of diffusion

Answer 24

1. molecular diffusion/random-walk process
2. turbulent diffusion/eddy diffusion

Question 25

it is the transfer of mass because of concentration gradient by means of individual movements of the molecules

Answer 25

diffusion

Question 26

what law does momentum transfer use?

Answer 26

newton's law of viscosity

Question 27

unit operations: component of a gas or a liquid solvent from nonvolatile solute

Answer 27

adsorption

Question 28

unit operations: a solute in a liquid solution is removed by contacting with another liquid solvent which is relatively immiscible with the solution

Answer 28

liquid-liquid extraction

Question 29

unit operations: separation of solid from the solution using filter

Answer 29

filtration

Question 30

unit operations: removl of a component from a gas stream by treatment with a liquid

Answer 30

absorption

Question 31

this is the gradual change in concentration of a species as a function of distance through a solution

Answer 31

concentration gradient

Question 32

it deals with the physical changes of the materials involved in the process

Answer 32

unit operations

Question 33

unit operations: separation of a solute from a liquid by diffusion of this solute from a liquid or gas through semipermeable membrane barrier to another fluid

Answer 33

membrane separation

Question 34

unit operations: removal of a solute from a solid mixture using solvent

Answer 34

solid-liquid extraction