LESSON 3 CHEM - PROP OF LIQUIDS

Question 1

• resist penetration
• can act like skin
• directly correlated to intermolecular attraction
• result to an inward pull among the molecules
• strong attractions between water that pulled slightly toward
• tightness across the surface
• polar molecules repelling each other
• causes raindrops to form beads
• insects “skate”

Answer 1

SURFACE TENSION

Question 2

HIGH SURFACE TENSION

Answer 2

stronger IMFA

Question 3

LOW SURFACE TENSION

Answer 3

weaker IMFA

Question 4

the ability of liquids to flow

Answer 4

FLUIDITY

Question 5

thickness or resistance to flow of a liquid

Answer 5

VISCOSITY

Question 6

VISCOUS

Answer 6

HIGH VISCOSITY, SLOW FLOW

Question 7

FLUID

Answer 7

LOW VISCOSITY, FAST FLOW

Question 8

MEASURES THE TIME OF A LIQUID TO FLOW

Answer 8

VISCOMETER

Question 9

Tendency polar of liquids to rise against gravity into small fine tubes (a capillary)

Answer 9

CAPILLARITY

Question 10

IMF within the liquid molecules

Answer 10

COHESIVE FORCES

Question 11

Forces between the liquid molecules and the walls of the tube

Answer 11

ADHESIVE FORCES

Question 12

The upper surface of a liquid in a tube is called the

Answer 12

meniscus

Question 13

WATER - Meniscus is concave

Answer 13

(Curved upward/inward) because adhesive forces are greater than cohesive forces.

Question 14

MERCURY - Meniscus is convex

Answer 14

(curved downward/outward) because cohesive forces are greater than adhesive forces.

Question 15

It explains how water moves against the force of gravity.
* It is due to the attraction among molecules of water and surrounding materials.
* It prevents water from moving through materials with pores.
* It causes clothing to stay dry.

Answer 15

Capillarity

Question 16

• Liquids can dissolve solids and other liquids and gases.
• Dissolve: when a solid, liquid, or gas becomes integrated into a host liquid (solvent)
• Particles become evenly dispersed among liquid particles

Answer 16

Miscibility

Question 17

• MISCIBLE LIQUIDS

Answer 17

• Dissolve in each other

Question 18

• IMMISCIBLE LIQUIDS

Answer 18

• Cannot dissolve in each other
• Particles remain separate

Question 19

• The equilibrium pressure of a vapor above its liquid (or solid)
• The pressure of the vapor resulting from evaporation of a liquid (or solid) above a sample of the liquid (or solid) in a closed container
• Depends on the magnitude of the intermolecular forces present and on the temperature

Answer 19

Vapor pressure

Question 20

HIGH VAPOR PRESSURE

Answer 20

volatile (easily evaporated) because of WEAK IMF
* Examples: acetone and alcohol

Question 21

LOW VAPOR PRESSURE

Answer 21

non-volatile (not easily evaporated) because of STRONG IMF
* Examples: honey and molasses

Question 22

• The ____________ of a liquid at a given temperature is determined by it intermolecular forces of attraction

Answer 22

VOLATILITY

Question 23

When liquid particles gain enough KE to overcome IMF, the liquid becomes gas.
When liquid particles lose energy so that the IMF become strong enough to hold the particles in fixed positions, the liquid becomes a solid.

Answer 23

• Freezing: KE < IMF
• Melting: KE > IMF
• Condensation: KE < IMF
• Boiling: KE > IMF

Question 24

is the rapid phase change of a liquid becoming a gas.

Answer 24

BOILING

Question 25

VAPOR PRESSURE=ATMOSPHERIC PRESSURE

Answer 25

BOILING POINT

Question 26

The higher the boiling point,

Answer 26

the stronger the IMFA.

Question 27

a change of state from liquid to gas.

Answer 27

VAPORIZATION

Question 28

is the energy required to vaporize 1 mole of a liquid at its boiling point.

Answer 28

Molar heat of vaporization

Question 29

• The amount of heat needed to vaporize a given amount of liquid at its boiling point is called .

Answer 29

heat of vaporization

Question 30

The stronger the IMF,

Answer 30

the higher the heat of vaporization is.