The chemistry of engineering materials

Question 1

vary in their behavior or characteristics

Answer 1

Solids

Question 2

two categories on the structure of solids

Answer 2

amorphous solid, crystalline solids

Question 3

In this category, the arrangement of particles lacks order. Its structures are similar to that of liquids in the atomic level, but the particles (ions, molecules, atoms) lack freedom of motion as compared to liquids. This category of solids does not have well defined shapes. Examples to this category of solids are rubber and glass

Answer 3

Amorphous solid

Question 4

are those where particles are arranged in an orderly repeating pattern. These orderly arrangements are likewise responsible to produce faces that make definite angles with one another resulting to develop highly regular shapes

Answer 4

Crystalline solids

Question 5

. The small repeating unit of a crystal that is made up of unique arrangement represents the structure of crystals

Answer 5

Unit cell

Question 6

This structure is built on the size and shape of the unit cell and locations of atoms within the unit cell.

Answer 6

Unit cells

Question 7

The red balls found in all corners of a cube represent particles making up a crystal structure

Answer 7

Lattice points

Question 8

the geometrical pattern of points on which the unit cells are arranged are known as

Answer 8

Crystal lattice

Question 9

The lines connecting the lattice points forms the _______that shapes a unit cell

Answer 9

Crystal lattice

Question 10

, a _____ is defined in terms of lattice points.

Answer 10

unit cell

Question 11

There are ______ crystal system

Answer 11

seven (7)

Question 12

The main parameter of any lattice is the number of nearest neighbors of a particle known

Answer 12

coordination number

Question 13

There are three types of cubic cells.

Answer 13

Simple Cubic unit cells
Face-centered cubic unit cells
Body-centered cubic unit cells

Question 14

contains eight (8) lattice points (white balls) found at the corners of the cube which is equivalent to one atom

Answer 14

Simple Cubic unit cell

Question 15

it contains 8 of 1/8 (of a particle) which is equal to one (1) particle. Every particle at each corner of the cube has two neighbors in each of the x, y and z axes making up a total of six (6) neighbors, therefore its coordination number is 6.

Answer 15

Simple Cubic unit cell

Question 16

Coordination number of simple cubic unit cells

Answer 16

6

Question 17

how many particles are in a simple cubic unit cell

Answer 17

8 of 1/8 of a particle, making up 1 particle.

Question 18

the crystal contains the same particles at each lattice point (corner) of a cube touching at the center particle but those at the corner do not touch each other

Answer 18

body-centered cubic unit cell

Question 19

There are 8 (white balls) of 1/8 (of a particle) at the corners of the cube and one (1 blue ball) particle at the center making up two (2) the same particles in a crystal.

Answer 19

Body-centered cubic unit cell

Question 20

Each particle has eight (8) nearest neighbors, four (4) above and four (4) below. Therefore, the coordination number is eight (8).

Answer 20

Body-centered cubic unit cell

Question 21

coordination number of body-centered cubit unit cell

Answer 21

8

Question 22

what a face-centered cubic unit cell contains

Answer 22

8 1/8 of a particle
6 1/2 of a particle
TOTAL PARTICLE=4

Question 23

There are eight (8) of 1/8 (of a particle) at the corners of the cube (white balls), and six (6 blue balls) of ½ (of a particle) is located at the six (6) faces of the cube in a

Answer 23

face-centered cubic unit cell

Question 24

). Total number of particles in this crystal structure is four (4).

Answer 24

face-centered cubic unit cell

Question 25

five (5) most important types of crystalline solids

Answer 25

Atomic, Molecular, Ionic, Metallic, and Network covalent solid crystals

Question 26

individual atoms are held together by dispersion forces

Answer 26

Atomic solid crystals

Question 27

only noble gases are the substance that belongs to this type

Answer 27

Atomic solid crystals

Question 28

only gases that belongs to atomic solid crystals

Answer 28

Noble gases

Question 29

solid crystals, depict individual molecule occupying the lattice points.

Answer 29

Molecular solid crystals

Question 30

are those solids that contains full charges compared to polar molecular solids whose charges are only partial positive and negative charges.

Answer 30

Ionic crystalline solids

Question 31

consist solely of metal atoms

Answer 31

Metallic solid crystals

Question 32

. The bonds that holds atoms together in metallic solid crystals is metallic bond

Answer 32

Metallic bond

Question 33

there are twelve (12) corners of 1/6 (of a particle) in both layers (A) below and above layer (B), making up 2 particles. There are also two (2) of ½ particle in both layers (A) above and below layer (B) located at the center of the hexagon equivalent to one (1) particle. Three particles are positioned in layer (B) summing up to six (6) particles in a hexagonal close packed unit cell.

Answer 33

HCP unit cell- Hexagonal Closed Packed

Question 34

are those solids where atoms are link together into a network of covalent bonds. Due to these strong network bonds, these types of crystalline solids generally have extremely high boiling and melting points

Answer 34

Network covalent crystalline solids