Chemical Equations (2)

Chemistry

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Chemical Equations (2)

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The examples of writing the chemical equation for the reaction between hydrogen and oxygen (2)

Write down the chemical formula of each reactant and product: H2 + O2 → H2O

The examples of writing the chemical equation for the reaction between hydrogen and oxygen (3)

Check whether the equation is balanced: H2 (2 atom H) + O2 (2 atom O) → H2O (2 H atom, 1 O atom) Equation is not balanced

The examples of writing the chemical equation for the reaction between hydrogen and oxygen (4)

Balance the equation by adjusting the coefficient in front of the chemical formula: 2H2 (4 H atom) + O2 (2 0 atom) → 2H2O (4 H atom, 2 O atom)

The examples of writing the chemical equation for the reaction between hydrogen and oxygen (5)

Write the physical state of each reactant and product: 2H2 (g) + 02 (g) → 2H2O (I)

The use of chemical equations (1)

Chemical equation can be interpreted qualitatively and quantitatively

The use of chemical equations (2)

From the qualitative aspect, chemical equations enable us to identify the reactants and products as well as their physical states

The use of chemical equations (3)

From the quantitative aspect, we can study the stoichiometry of chemical equations

Definition of stoichiometry

Is the quantitative study of the composition of substances involved in a chemical reaction

The use of chemical equations (4)

Coefficients in chemical equation show the ratio of substances involved, either as the ratio of elementary entities of substance or the mole ratio

The use of chemical equations (5)

Based on the mole ratio of substances from a balanced chemical equation, various numerical problems can be solved by calculating the number of moles of substances required in the right ratio

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Chemical Equations (2)

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