SCIENCE-X
Unit-1
BIJU
ANTONEY
❑ Chemical change & physical change.
❑ Chemical formula and equations.
❑ Balanced chemical equations & state symbols.
❑ Types of Chemical reactions.
❑ Redox reactions.
❑ Reducing agent & oxidizing agent.
❑ Exothermic & Endothermic reactions.
❑ Rancidity
❑ Corrosion of metals.
Physical Change
1.In a physical change there
is a difference in the
appearance, smell, or simple
display of a sample of matter
without a change in
composition.
Eg: Melting of ice
Chemical Change
1.In a chemical reaction,
there is a change in the
composition of the
substances and a new
substance with new
properties is formed.
Eg: Burning of a candle
A chemical reaction is characterized by one
or more of the following characteristics:
➢ Change in color
➢ Change in State
➢ Change in temperature
➢ Evolution of gas
https://youtu.be/8w9yRxBZzSo
1.Color change in reaction: Colorless to yellow
Example:
Pb(NO3)2 (aq) + 2KI (aq)
PbI2 (PPt) + 2KNO3 (aq)
Lead nitrate
Potassium Iodide
Lead Iodide
(Yellow)
Potassium nitrate
https://youtu.be/m1m3YKla8-o
2
https://youtu.be/73dw6w0zNXA
Equation:
Pb(NO3)2 (aq) +
2KI (aq)
Lead nitrate
Potassium Iodide
PbI2 (PPt)
Lead Iodide
+
2KNO3 (aq)
Potassium nitrate
Some of the chemical reactions are resulting
in the evolution of gas.
Example:
CaCO3 + H2SO4
CaSO4 + CO2 +H2O
Eg:
QUICK LIME
Slaked lime
https://youtu.be/UGf60kq_ZDI
(ppt)
(Δ)
Precipitate
Evolution of gas
Liberation of heat
Sample questions:
1
2
1.
(a)
(b)
(c)
(d)
(e)
(f)
https://youtu.be/vNWyWsXEetA
https://youtu.be/Im23nVpB0bE
I.Metal coating
i)Galvanisation
ii)Nickel Plating
iii)Chromoplating
iv)Silver plating etc.
II.Nonmetal coating
i)Plastic coating
ii)Rubber coating
iii)wooden coating
iv)Painting
v)Coating with oil/grease
III.Alloying- Making the alloy of the given metal
IV.Anodisation
To protect the underground steel piping is laid in along with a
more reactive (sacrificing)metal like magnesium.
Thank you