Page 7 - E-Science Prep3 2024-2025 t1 Unit2_Neat

Science department Second Substitution Reactions
Prep.3

Simple substitution reactions Double substitution reactions

Active metal + Water “Neutralization” Acid + Alkali

Metal hydroxide + Hydrogen Salts + Water

Sodium is preserved under kerosene

Active metal + acid Acid + salt

Salt of acid + Hydrogen

Zn + HCl ZnCl2 + H2 Carbon dioxide turbids the clear
2Al + HCl 2AlCl3 + 3H2 limewater
Cu + HCl No reaction

Zn & Al precedes H in C.A.S but aluminum
delay in the reaction as it has a layer of Al2O3
on its surface that takes a time to separate it.

Cu doesn’t replace H as
it comes after H in C.A.S

H2 burns the burning match with a pop sound.

Metal A + Metal B salt sol. 2 salt solutions

Metal A salt sol. + Metal B Formation of (ppt.) salt X dissolve

Mg + CuSO4 Blue NaNO3 + AgCl
Red + Colorless NaCl + AgNO3 White (ppt.)

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Second Term
Term