Module Chemistry

Another friend of Libra

Dexter Patrick S. Baltazar

Pre-test: Chemical balancing
Instruction: Balance each chemical equation by adding a correct coefficient to it.
Question 1
__ SnO2 + __ H2 → __ Sn + __ H2O
Question 2
__ KOH + __ H3PO4 → __ K3PO4 + __ H2O
Question 3
__ KNO3 + __ H2CO3 → __ K2CO3 + __ HNO3
Question 4
__ Na3PO4 + __ HCl → __ NaCl + __ H3PO4
Question 5
__ TiCl4 + __ H2O → __ TiO2 + __ HCl
Question 6
__ C2H6O + __ O2 → __ CO2 + __ H2O
Question 7
__ Fe + __ HC2H3O2 → __ Fe(C2H3O2)3 + __ H2
Question 8

__ NH3 + __ O2 → __ NO + __ H2O
Question 9
__ B2Br6 + __ HNO3 → __ B(NO3)3 + __ HBr
Question 10
__ NH4OH + __ Kal(SO4)2·12H2O → __ Al(OH)3 + __ (NH4)2SO4 + __ KOH + __ H2O

After reading this module, you will be able to achieve the following objectives:
To identify the steps in balancing a chemical equation
To balance equation correctly using the proper way
To write an analogy about balancing
To relate balancing into real life
Lecture:
A chemical equation describes what happens in a chemical reaction. The equation identifies the reactants (starting materials) and products (resulting substance), the formulas of the participants, the phases of the participants (solid, liquid, gas), and the amount of each substance. Balancing a chemical equation refers to establishing the mathematical relationship between the quantity of reactants and products. The quantities are expressed as grams or moles.
Balancing equations is a fundamental skill in Chemistry.
Steps in balancing equation:
1. Write the unbalanced equation.
Chemical formulas of reactants are listed on the lefthand side of the equation.
Products are listed on the righthand side of the equation.
Reactants and products are separated by putting an arrow between them to show the direction of the reaction. Reactions at equilibrium will have arrows facing both directions.
2 Balance the equation.
Apply the Law of Conservation of Mass to get the same number of atoms of every element on each side of the