PhyPharm Liquids Quiz

Question 1

Define Liquid

Answer 1

A fluid that has the particles loose and can freely form a distinct surface at the boundaries of its bulk material

Question 2

What are the Characteristics of Liquids?

Answer 2

1. Liquid shape is determined by container it fills
2. Can display immiscibility
3. Surface of liquid behaves elastic membrane in which SURFACE TENSION appears, allowing the formation of DROPS and BUBBLES
4. Liquids at their respective boiling point reaches to GASES and at their FREEZING POINT, change to SOLIDS
5. The VOLUME of quantity of liquid is fixed by Temperature and PRESSURE
6. Liquids are often treated as INCOMPRESSIBLE

Question 3

What are the Property of Liquids

Answer 3

Viscosity - Resistance to Flow
-Increase Intermolecular Force; Increase Viscosity
-Increase Temperature; Decrease Intermolecular Force; Decrease Viscosity

Question 4

Is the process by which substances in their gaseous substance in their gaseous state are converted to the liquid state?

Answer 4

Liquefication gases

Question 5

What does Liquefication of gases mean?

Answer 5

When PRESSURE on gas is increased , its molecules gets close together, and its TEMPERATURE is reduced, which removes enough ENERGY to make it change from the gaseous to the liquid state

Question 6

What are the 2 important properties of gases necessary in developing methods for their liquefication?

Answer 6

1. Critical temperature
2. Critical Pressure

Question 7

Is the temperature at which no amount of pressure, will cause the gas to liquefy?

Answer 7

Critical temperature

Question 8

The minimum pressure required to liquefy the gas at the critical temperature?

Answer 8

Critical pressure

Question 9

The liquid can no longer exist, because the vapor of the substance cannot be liquified?

Answer 9

Critical Temperature

Question 10

What is the critical temperature for carbon dioxide?

Answer 10

304K (87.8 degrees Fahrenheit [31 degrees Celsius]

Question 11

What is the critical pressure for Carbon dioxide?

Answer 11

72.9 atmospheres

Question 12

What are the critical temperature & pressure of nitrogen?

Answer 12

126 K (-232.6°F [-147°C])
33.55 atm

Question 13

What are the critical temperature & pressure of ammonia gas?

Answer 13

406 K (271.4°F [133°C])
112.5 atm

Question 13

What are the critical temperature & pressure of helium?

Answer 13

5.4 K (-449.9°F [-267.7°C])
2.25 atm

Question 14

What is the critical temperature and critical pressure of water?

Answer 14

374OC or 647 K
218atm.

Question 15

What is the method of liquefcation

Answer 15

By compressing the gas at
temperatures less than its critical
temperature.

Question 16

What is the principle of liquefaction

Answer 16

The cooler the gas is to
begin with, the less pressure is
needed to make it condense.

Question 17

this method is used to liquefy gases
whose critical temperature is above or just
below atmospheric temperature.?

Answer 17

Faraday’s Method

Question 18

this method compressed the gas
to 200 atm, which is then allowed to
pass through a pipe cooled by liquid
ammonia

Answer 18

Linde’s Method

Question 19

the compressed gas at 200 atm
is allowed to pass through
refrigerating liquid, which then
enters the expansion chamber.

The gas is allowed to expand freely
through narrow opening which
results in cooling of gas.?

What Method is this?

Answer 19

Claude’s Method

Question 20

is a system that depends on the
power of compressed or liquefied gas
to expel the contents from the
container.

Answer 20

AEROSOLS

Question 21

a.) the drug product is either dissolved or suspended in propellant (gas which is liquefied under pressure).

b.) By pressing the valve excess pressure is created inside the container, that expels the contents.

c.) As soon as the contents are exposed to
atmospheric pressure, they evaporate
and forms a fine spray.

Answer 21

Aerosol systems

Question 22

a thing or substance that causes something to move or be driven forward or outward, in particular.

Answer 22

Propellant

Question 23

an inert fluid, liquefied under pressure, in which the active contents of an aerosol are dispersed.

Answer 23

Propellant

Question 24

What are the Various propellants used in manufacture
of aerosols?

Answer 24

a.) Hydrocarbons (propane, butane, etc)

b.) Chlorofluorocarbon

c.) Nitrogen

d.) Nitrous oxide

Question 25

What are the advantages of liquefaction of aerosols

Answer 25

1.) Direct delivery of medicament to the
affected area, such as spray.

2.) Removal of contents without
contamination.

3.) Stability of the drug substance can be
enhanced as they do not come in
contact with moisture and oxygen.

4.) Mechanical application can be avoided.

Question 26

It is the intermediate state between
the solid and the liquid states.

Answer 26

The Liquid crystalline State

Question 27

He is an Austrian botanist
In 1888 began a study of liquid
crystals.

Answer 27

Freidrich Reinitzer

Question 28

It had two distinct melting points?

Answer 28

cholesteryl benzoate