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State symbols in Chemical Equations

CBSE CHEMISTRY IB DIPLOMA CHEMISTRY IGCSE CHEMISTRY MYP 3 MYP 4 MYP 5 MYP CHEMISTRY Stoichiometric Relationships

State symbols in Chemical Equations are very key to get marks in IB diploma exams. It is not difficult to use state symbols in chemical equations.

What is state symbols? 

State symbols are symbols used to represent the physical state of reactants and products in a chemical equation.

Example:

White solid magnesium Oxide is formed when Magnesium metal ribbon is burned in air( oxygen gas).

2Mg(s) + O2(g)    à 2 MgO(S) 

Try to write the state symbols of the following equations:

Ag+   + X−   → AgX(s)

Na2O + H2O → 2NaOH

 MgO + H2O → Mg(OH)2

Li2O(s) + 2HCl → 2LiCl  + H2O

MgO + 2HCl  → MgCl2 + H2O

P4O10+ 6 H2O→ 4H3PO4

Hint: Use following points for deciding state symbols.

For acids and ionic compounds you can use aqueous solutions with out much thinking. For most diatomic molecules you can use gas as state symbol if you do not have any idea. In the chemical reactions between halogens and halogen compounds, the halogen molecules like chlorine molecule(Cl2) etc you should use aqueous as state symbol. for all metals except mercury , use solid as state symbol.

Read about Important Chemical Equations for IB

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