3) The color of solution will turn from Blue to Colorless.
The color of solid will turn to a Pink-Brown coating
4) AL-Electrolysed
Zn-Thermal Reduction
Cu-Thermal Reduction or found as an element
5) Fe(s) + H2SO4(aq) --- FeSO4(aq) + H2(g)
OBSERVATIONS:
Solution changes from colorless to green
Fe shrinks as it reacts with an acid
6) i) X>Z>W>Y
ii) Z
7) i)K>Mg>Zn>Fe>Cu
ii) Between Fe and Cu
iii) Because Cu can not displace H while Fe can
iv) Galvenizing means coating a substance with thin layer of Zn. It is done to
prevent rust
8) a) i) Thermite Process
ii) Displacement rxn means a more reactive metal is used to displace a less reactive metal from its compound
b) Oxidized: Al Reduced: Fe2O3
9) i) Heametite
ii) Silica (sand)
iii) Pic Iron
10) Ca>Mg>Zn>Cu
b) Reaction: Ca + H2O
Observations: Bubbles of H2 gas
Milky solution
11) a) i) Heametite ii) Limestone
b) CO
Equation: Fe2O3 + 3Co----2Fe + 3CO2
c) CaCO3 ------- CaO + CO2 (Thermal Decomposition)
The CaO is used to make slag
12) Al. Because as soon as Al is exposed to air, a small layer of Aluminium Oxide is formed. The layer stops it from reacting from any other thing and at first the reaction is slow.
13) i) No Change
ii) Blue solution turns green and there will be a red-brown coating
14) Al2O and Fe
15) a) Fe, b) K, c) Zn, d) Fe,Zn, e)Cu
16) a) i) Heametite-Fe2O3
ii) Limestone-CaCO3
b) Gas:CO
Equation: 1) C + O2 ------- CO2
2) Co2 + c ------- 2CO
17) b) Costly to maintain temperature, High melting Point and Expensive
c) Al+3 + 3e- --------- Al
d) At high temperature C will be reacting with O2. Carbon blocks will become thinner. C + O2 --------- CO2
e) Use: Used for overhead electrical cables
Property: Good...
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