Lesson 1.3: Intermolecular Forces and Properties of Liquids

Question 1

It is the property of a liquid to resist an external force and thus assume a lesser surface area.

Answer 1

surface tension

Question 2

This is attributed to the strong attractive and cohesive forces between and among the molecules, particularly at the surface of the liquid.

Answer 2

surface tension

Question 3

Several manifestations of this property are the ability of water to hold a relatively heavier paper clip on its surface and to allow water striders to walk on its surface.

Answer 3

surface tension

Question 4

Moreover, the ______________________ explains why spherical water droplets form on leaves.

Answer 4

strong cohesive force

Question 5

It is the resistance of a liquid to flow

Answer 5

viscosity

Question 6

It is loosely tension of water
referred to as the thickness or thinness of a liquid.

Answer 6

viscosity

Question 7

The greater the _____________________, the more ___________ the substance.

Answer 7

• intermolecular forces
• viscous

Question 8

It is the pressure exerted by its vapor when in equilibrium with its liquid or solid.

Answer 8

vapor pressure

Question 9

This means that when a liquid or a solid substance is made to evaporate in a closed container, the gas exerts a pressure above the liquid.

Answer 9

vapor pressure

Question 10

Substances with relatively strong intermolecular forces will have ______________________ because the particles will have difficulty escaping as a gas.

Answer 10

low vapor pressure

Question 11

It is the temperature at which its vapor pressure is equal to the external or atmospheric pressure.

Answer 11

boiling point

Question 12

The normal boiling point of water is _______.

Answer 12

100°C

Question 13

At higher altitudes, the atmospheric pressure is ______________; hence, the boiling point
will subsequently __________.

Answer 13

• lower
• decrease

Question 14

It is the amount of heat required to vaporize one mole of a substance at its boiling point.

Answer 14

Molar beat of vaporization

Question 15

It is made up of 3 atoms.

Answer 15

water molecule (H20)

Question 16

It is polar.

Answer 16

water

Question 17

In each water molecule, the ____________ attracts more than its “fair share” of electrons.

Answer 17

oxygen atom

Question 18

The oxygen end “acts” ___________.

Answer 18

negative

Question 19

The hydrogen end “acts” ___________.

Answer 19

positive

Question 20

The ends causes the water to be ___________.

Answer 20

polar

Question 21

However, water is _________.

Answer 21

neutral

Question 22

One hydrogen bond is _______, but many hydrogen bonds are ________.

Answer 22

• weak
• strong

Question 23

In the interaction between water molecules, ____________ end of water molecule is attracted to the positive hydrogen end of another water molecule to form a ______________.

Answer 23

• negative oxygen
• hydrogen bond

Question 24

It refers to the attraction between particles of the same substance (which is why water is attracted to itself).

Answer 24

cohesion

Question 25

This results in surface tension.

Answer 25

cohesion

Question 26

It is the measure of the strength of water's surface.

Answer 26

surface tension

Question 27

It produces a surface tension on water that allows insects to walk on the surface of water.

Answer 27

cohesion

Question 28

It is the attraction between 2 different substances.

Answer 28

adhesion

Question 29

This is when water will make hydrogen bonds with other surfaces such as glass, lant tissues, soil, and cotton.

Answer 29

adhesion

Question 30

It is when water molecules will "tow" each other along when in a thin glass table.

Answer 30

capillary action