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Chemical Equations
Chemical Equation
3.4
Chemical Equation
Chemical Equation
How to Write Chemical Equations Chemical equations can be written in the form of words or using chemical formulae.
The starting substances or reactants are written on the left-hand side of the equation while the new substances formed or products are written on the right-hand side of the equation.
The arrow '→’ means ‘produces’.
The physical state of each substance, whether solid(s), liquid(l), gas(g) or aqueous solution(aq) is usually indicated in a chemical equation.
Steps in Determining the Chemical Equation
The following diagram is the steps in determining the chemical equation:
Below shows an example of a chemical equation:
\(Mg(s) + 2HCl(aq) \rightarrow MgCl_2(aq) + H_2(g)\)
* Note: (s) solid state, (aq) aqueous state and (g) gas state.
From the chemical equation above, we know, solid magnesium and HCl are the reactants.
These two reactants react and become magnesium chloride.
For better understanding, pay attention to the coefficient for each reactant and product in the chemical equation.
One mole of magnesium reacts with 2 moles of hydrochloric acid to produce 1 mole of magnesium chloride and 1 mole of hydrogen gas.
Chemical Equation
3.4
Chemical Equation
Chemical Equation
How to Write Chemical Equations Chemical equations can be written in the form of words or using chemical formulae.
The starting substances or reactants are written on the left-hand side of the equation while the new substances formed or products are written on the right-hand side of the equation.
The arrow '→’ means ‘produces’.
The physical state of each substance, whether solid(s), liquid(l), gas(g) or aqueous solution(aq) is usually indicated in a chemical equation.
Steps in Determining the Chemical Equation
The following diagram is the steps in determining the chemical equation:
Below shows an example of a chemical equation:
\(Mg(s) + 2HCl(aq) \rightarrow MgCl_2(aq) + H_2(g)\)
* Note: (s) solid state, (aq) aqueous state and (g) gas state.
From the chemical equation above, we know, solid magnesium and HCl are the reactants.
These two reactants react and become magnesium chloride.
For better understanding, pay attention to the coefficient for each reactant and product in the chemical equation.
One mole of magnesium reacts with 2 moles of hydrochloric acid to produce 1 mole of magnesium chloride and 1 mole of hydrogen gas.
Chapter : Mole Concept, Chemical Formulae and Equations
Topic : Chemical Equations
Form 4
Chemistry
View all notes for Chemistry Form 4
Related notes
Relative Atomic Mass and Relative Molecular Mass
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Chemical Formula
Development in Chemistry Field
Scientific Investigation in Chemistry
Usage, Management and Handling of Apparatus and Materials
Basic Concept of Matter
The Development of the Atomic Model
Structure of the Atom
Isotopes and Their Uses
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