46 - Metallic Structures Flashcards
What aspect of metals cause all properties of metals?
The free electrons
What do the free electrons in metals do?
Hold atoms together with electrostatic attraction to positive ions
Allow layers to slide
Allow conduction of heat and electricity
Why might someone create an alloy?
For a harder substance
How are alloys harder than normal metals?
The different shaped atoms distort the layer arrangements
Giant ionic, simple molecular, giant covalent, giant metallic:
Which has very low MP and BP and doesn’t conduct electricity?
Simple molecular
Giant ionic, simple molecular, giant covalent, giant metallic:
Which has very high MP and BP and conducts electricity?
Giant metallic
Giant ionic, simple molecular, giant covalent, giant metallic:
Which has very high MP and BP but doesn’t conduct electricity?
Giant covalent
Giant ionic, simple molecular, giant covalent, giant metallic:
Which has high MP and BP and conducts electricity when molten?
Giant ionic
What type of substance is an alloy?
A mixture
How can metals conduct electricity?
Closely packed giant lattice -> made of positive ions -> with lots of free electrons -> which can move through metal and carry current
What is an alloy?
A metal mixture containing different sized atoms
What are the issues with copper?
It is too soft and malleable
It is running out
How is aluminium manufactured?
The electrolysis of cryolite and aluminium oxide
Why are instrumental methods of analysis used to detect metal impurities?
Accuracy
Sensitive
Rapid
Small sample
