(b): Chemical and physical change(energy is absorbed)
(c): Chemical change(energy is absorbed).
Ans 2:
Galvanizing protects from rust in a number of ways: It forms a barrier that prevents corrosive substances from reaching the underlying steel or iron. The zinc serves as a sacrificial anode so that even if the coating is scratched, the exposed steel will still be protected by the remaining zinc.
Ans 3:
Crystallisation is a purification process for impure salts. The crystal form of a salt. Crystallisation is used to separate and purify substances, and in this process, large crystals are formed.
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Explanation:
And 1:
(a): Chemical change(energy is evolved)
(b): Chemical and physical change(energy is absorbed)
(c): Chemical change(energy is absorbed).
Ans 2:
Galvanizing protects from rust in a number of ways: It forms a barrier that prevents corrosive substances from reaching the underlying steel or iron. The zinc serves as a sacrificial anode so that even if the coating is scratched, the exposed steel will still be protected by the remaining zinc.
Ans 3:
Crystallisation is a purification process for impure salts. The crystal form of a salt. Crystallisation is used to separate and purify substances, and in this process, large crystals are formed.
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