Lesson 2: Phase change in states of matter

Question 1

Properties of Liquids

Answer 1

1. Surface Tension
2. Viscosity
3. Vaporization
4. Molar heat of vaporization

Question 2

The force that causes the surface of a liquid to contract

Answer 2

Surface Tension

Question 3

_____ has high surface tension due to hydrogen bonds

Answer 3

Water

Question 4

_______ affects surface tension

Answer 4

Temperature

Question 5

The ability of a liquid to flow and/or the liquid’s resistance to flow

Answer 5

Viscosity

Question 6

High resistance, high viscosity
High ___________, low viscosity

Answer 6

temperature

Question 7

The state change from liquid to gas, while the opposite is condensation

Answer 7

Vaporization

Question 8

________ tend to evaporate faster than water

Answer 8

Volatile liquids

Question 9

___ and vapor are similar but not the same

Answer 9

Gas

Question 10

Vaporization includes:

Answer 10

evaporation and boiling

Question 11

The formation of liquid to gas with the addition of heat as form of energy

Answer 11

Molar heat of vaporization

Question 12

The amount of heat needed to vaporize a given amount of liquid at its boiling point

Answer 12

Heat of vaporization

Question 13

The unit of crystalline solids is called _____.

Answer 13

unit Cells

Question 14

The structure can be subdivided into _____ and ______ packages.

Answer 14

simple, close-packed

Question 15

In a close-packed structure, the gap between the particles is called ______.

Answer 15

a void

Question 16

Types of Solids

Answer 16

1. Amorphous Solids
2. Crystalline Solids

Question 17

1. Atom arrangement is not organized as definite pattern
2. Pseudo-solids/supercooled liquids
3. Ranged melting points
4. Isotropic

Answer 17

Amorphous solid

Question 18

1. True solids
2. Sharp melting point
3. Anisotropic
4. Has repeated units that form a hexagon shape

Answer 18

Crystalline solid

Question 19

Same response in any direction/same physical properties in different directions

Answer 19

Isotropic

Question 20

Different response in any direction/different physical properties in different directions

Answer 20

Anisotropic

Question 21

Types of Crystalline Solids

Answer 21

1. Ionic Solids
2. Covalent Solids
3. Molecular Solids
4. Metallic Crystals

Question 22

Have + and - ions held together by electrostatic attractions (ionic bond e.g. NaCl)

• High melting points
• Brittle
• Insulator (solid form)
• Conductor (molten form)

Answer 22

Ionic Solids

Question 23

Contain a three-dimensional network of covalently bonded atoms

Answer 23

Covalent Solids

Question 24

• Very hard
• High melting point
• Poor conductors

Answer 24

Diamond

Question 25

• Soft
• Electrically conductive

Answer 25

Graphite (exception)

Question 26

Are formed through covalent bonds

• Soft
• Low to moderately high melting points
• Poor thermal and electrical conductivity
• Ice, table sugar

Answer 26

Molecular Solids

Question 27

Are the uniform distribution of atomic nuclei within a sea of delocalized electrons

• High melting points
• Malleable and ductile
• Good conductors

Answer 27

Metallic Crystals

Question 28

1. Evaporation
2. Melting
3. Sublimation

Answer 28

Endothermic

Question 29

1. Condensation
2. Freezing
3. Deposition

Answer 29

Exothermic

Question 30

Absorb heat

Answer 30

Endothermic

Question 31

Release of heat

Answer 31

Exothermic

Question 32

Solid to gas

Answer 32

Sublimation

Question 33

Gas to solid

Answer 33

Deposition

Question 34

It is the point at which all three distinct phases of matter (solid, liquid, and gas) coexist

Answer 34

Triple Point

Question 35

A point where liquid and gas are indistinguishable

Answer 35

Critical point

Question 36

Placing albatross/moth balls to a specific room

Answer 36

Sublimation