Material science exam 1

differnece between silcion and silcione

The methods used to create, shape, or modify a material.

Processing (answer) → Structure → Properties → Performance

The arrangement of a material’s internal components.

Processing → Structure (answer) → Properties → Performance

Measurable characteristics describing how a material behaves.

Processing → Structure → Properties (answer) → Performance

How well a material performs its intended job.

Processing → Structure → Properties → Performance (answer)

important info for Processing → Structure → Properties → Performance

info slide

Number of _____ largely determines the chemical property of a neutral atom

INONIC BONDING IS _____

non-directional

How are the atoms arranged inside the solid? if they are no repeating arrangments……..

amorphous

info slide basis and lattice

“killer memory trick”

metallic bonding is nondirectional or directional

nondirectional bonding

info slide (If given atomic radius and asked for density)

1 amu=1.66×10−24 g … 2.7316×10^26 atoms

Atomic mass is the mass of an individual atom, whereas atomic weight is the weighted average of the atomic masses of an element’s naturally occurring isotopes.

4f

the electron shell

.153

metalic, van der walls

alkali metal

D

8.57 g/cm³

B

0.122

4.75 × 10^-29

a = 4r / 3

1.75 g/cm³

1.633

1.44 × 10^-8

c

using the data provided, calculaute the volume of the unit cell for molybdenum (Mo) in (nm³)

.03119

all

bounus question #1…. What does 10k,14k,and 24k mean in gold karats and why that is the case?

10K, 14K, and 24K describe how much pure gold is in the jewelry out of 24 total parts. 10K gold is 10/24 gold, or about 41.7% pure gold. 14K gold is 14/24 gold, or about 58.3% pure gold. 24K gold is 24/24, meaning it is essentially 100% pure gold.

The rest of the material in 10K and 14K gold is made of other metals, such as silver or copper, which make the gold harder and more durable

bounus question #2….. wHat are the alloy composition in the texas a&m aggie ring (best guess of course) and why?

The Texas A&M Aggie Ring is likely made of gold mixed mainly with copper, silver, and a small amount of zinc. In a 10K ring, about 41.7% is pure gold, while the rest is alloy metal. 1

10K Aggie Ring is about 42% gold, 30% silver, 22% copper, and 6% zinc. The silver and copper make the ring harder and more durable, while zinc helps with casting. The exact alloy recipe is not publicly released.

too much gold is too malliable

bounus question #3….. explain karat vs carat (a sentence)

Karat measures the purity of gold, while carat measures the weight of gemstones like diamonds.

[1 2 0]

[-1 -4 3]

[2 2 1]

(1 1 0)

(4 0 -3)

(1 0 0)

(-1 0 1 0)

(2 -2 3)

[0 -1 1]

-1.19 percent

watch video as well if need

watch video as well if need

c

c

examples of what they are used for

What are the 3 types of polymer tacticity?

a

Why is Teflon (PTFE) non-stick?

Teflon has very low surface energy because its surface is covered in fluorine atoms, so other materials have very weak attraction to it.

examples of thermoplastics

examples of thermosets (perma set)

What happens when you heat thermoplastics vs thermosets?