Structure an materials Flashcards
(53 cards)
What is a transition metal
The block of elements found between group 2 and 3 of the periodic table
Properties of transition elements
Hard
strong
Dense
High melting and boiling points
Form coloured compounds
Good conductors of heat and electricity
Malleable ductile
Less reactive than alkali metals
Have different ion charges
Used as catalyst
How dense is a transition metal
Highly dense
Why can transition metals be used in cars buildings and bridges.
Because they are resistant to corrosion (except iron)
What is corrosion in iron called
Rust
How reactive is transition element
The general trend is to decrease in reactivity from left to right across the table except for zinc and iron
What happens to the electrons when a transition element reacts
They loose them to form posotive ions
What transition metals only form posotive ions
Ag+ ion
Zn2+ ion
Uses of iron
Building materials
Tools
Vehicles
Catalyst in the haber process
Uses of titanium
Fighter aircraft
Artificial hip joints
Pipes in nuclear power stations
Uses of copper
Electric cables
Water pipes
Coins
Where does the word nano come from
The Greek word which means dwarf
What is 1 nanometre in a metre
0.000,000,001 M
How big is in atom in nm
0.001-0.01
How big is a nanoparticle in nm
1-100
How big is a fine particle in nm
100-2500
How big is a course particle in nm
2500-10,000
Which is bigger in a nanoparticle surface are or volume
There is a larger surface are to volume ratio
Why are the properties of a nanoparticle different
Because they have a high surface are to volume ratio
Where do nanoparticle occur
Naturally
Accidentally
By design
What can happen if you put nanoparticle on your skin
They can get into blood stream
What cosmetics are nanoparticle in
Sun cream deodorant medicine
What can you add nanoparticle to
Polymer
Plasters
Bandages
Plastic
What are ceramics
A product made essentially from a non metallic mineral by firing at a high temp
