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physical and chemical changes - Coggle Diagram
physical and chemical changes
physical change
have changes in property
physical property like shape, size, colour, state
ex: cutting a piece of paper, cushing piepce of chalk, melting of wax, crystallization, dissovling sugar in water etc.
genrally revesible
no new substance is formed
chemical changes
a change which one or more new subtance are formed
example. buring of coal, extration of metal for ore, rusting
nail in copper sulphate (ag) blue colour solution
Fe + CuSO4 + FeSO4 + Cu
burning of magnesium
magnesium + oxygen --> magnesium oxide
add water
MgO + H2O ---> magnesium hydroxide
basic in natural
turn red litmus blue
vinegar + baking soda
CH3 COOH + NaHCO3 --> CH3 COONa + H2O + CO2
co2 --> pass through lime water
CO2 + Ca(OH)2 --> CaCO3 + H2O
lime water turns milky
rusting
prevenation through
galvanization
process of depositing a layer zinc on iron
for rusting presence of oxygen and water both is essential
Fe + O2 + H2o
add carbon, chromium, nickle, manganese
stainless steel
ozone layer
absorb uv rays & breakdown to oxygen
protect us for the harful uv radiation