Alloyed Metals

Question 1

What will a thermodynamic system try to achieve?

Answer 1

Reach minimum energy.

Question 2

What is Entropy, what symbol does it have and is a process favourable if it is negative or positive?

Answer 2

Level of particle disorder.
S.
Positive.

Question 3

What is Enthalpy, what symbol does it have and is a process favourable if it is negative or positive?

Answer 3

Internal energy of a thermodynamic system.
H.
Negative.

Question 4

What is the equation used to show how favourable a system is?

Answer 4

G = H - T * S

G = free energy of change (energy freed up by the change)
H = Enthalpy change
T = Temperature in Kelvin that the process took place at
S = Entropy change

Question 5

What are the four ways two liquids can mix?

Answer 5

1. Complete solubility: Fully mixed forming one homogenous solution.
2. Partial solubility
3. Complete Insolubility e.g water and oil
4. Reaction: reaction occurs and new compound created.

Question 6

When mixing two materials which is the solvent material?

Answer 6

Material in greater proportion.

Question 7

When mixing two materials which is the solute material?

Answer 7

Material in lesser proportion.

Question 8

Under what conditions will atoms mix the best to form a substitutional solid?

Answer 8

If they are similar size, same crystal structure, same valence and similar electronegativity.

Question 9

What is a substitutional solid?

Answer 9

An alloy where solute atoms replace some solvent ones in the crystal structure.

Question 10

What is an interstitial solid?

Answer 10

A solid where the solute atoms fit into the small gaps in the solvent crystal structure.

Question 11

What is an intermediate compound?

Answer 11

A combination of elements (metals and / or non metals)