metals and reactivity series

Question 1

what is the arrangement of metals

Answer 1

Lattice
positive ions into a sea of mobile electrons with attraction between them

Question 2

what are the physical properties of metals and why

Answer 2

1. Shiny due to delocalized electrons reflecting light
2. HIgh density because they are closely packed
3. High MP and BP due to strong electrostatic attraction between positive ions and delocalized electrons
4. malleable and ductile because they made of layers which can slide over each other
5. conduct electricity because delocalized electrons can move to carry current

Question 3

what are alloys

Answer 3

mixture of 2 metals or metal and non metal

Question 4

why are alloys formed

Answer 4

to either increase strenth or resist corrosion

Question 5

how do alloys work

Answer 5

particles of diff size (big and small) cancel each others properites out (such as sliding over each other)
which distorts structure.

Question 6

what are the 2 unique properties that aluminum has

Answer 6

Low density. is used for cooking pans and over head cables

resist corrosion, why?
Protective layer of aluminum Oxide Al2O3
this is also the same reason it reacts slowly even though it has high reactivity. because layer of Al2O3 needs to dissolve first. is used for food cans and aircraft bodies.

Question 7

order of reactivity

Answer 7

K Na Ca Mg Al Zn Fe Pb
Hydrogen copper silver gold

Question 8

reactivity series with water first 3 metals with water

Answer 8

Potassium.
Catches fire with cold water, floats and fizzes

Sodium. with cold water
Shoots across, float & fizz

Calcium.
SInks. pushed up and down by bubbles of gas with cold water. is partially soluble, dissolve turbidity.

Question 9

reactivity series next 4 metals with water

Answer 9

Mg Al Zn Fe

react with steam only
glows brightly with smoke and forms white powder

Question 10

reactivity of Pb H Cu Ag Au with water

Answer 10

no reaction

Question 11

how do metals react with acids

Answer 11

metals below hydrogen in reactivity series have no reaction EG.’
Cu + H2SO4 = no reaction

metals above hydrogen displace it and give salt and hyrdogen such as
Zn + H2SO4 = ZnSO4 + H2

Question 12

metals with other metals reactions EG Zn with copper sulfate

Answer 12

more reactive metals displace less reactive metals obv

Zn + CuSO4 = ZnSO4 + copper

observations
1. Zn disappear and dissolve
2. brown ppt of copper
3. solution turns from blue to colourless

Question 13

iron with copper sulfate

Answer 13

Fe disappear and dissolve
Brown ppt of copper
solution goes from blue yo green.