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Grade 9

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Good day, 9th graders!

Read the synopsis of our lesson today.


*Writing and Balancing Chemical Equations

*Types of Chemical Reactions

The environment that surrounds us is changing every second. These changes have very important roles in man's life. Cooking your food will be impossible without the combustion of fuels. The ice used to cool your drinking water, the naphthalene balls used to drive insects away - all of these must undergo changes to satisfy human needs.

In the industry, the knowledge of these changes is very important. The chemist of a manufacturing firm must know the amount of raw materials needed to yield a desirable quality and quantity of product. It is very important for a chemist to avoid wastage of raw materials, manpower, time and money in the manufacturing process.

When substance undergoes a change, some or all of its properties may alter. In this lesson, we will study the changes matter undergoes. Our emphases are the chemical reactions and the rules that govern them.

Chemical formulas represent compounds. They indicate the number of atoms of each element present in a compound.

In formula writing, the total positive charges must be equal to the total negative charges. The net charge on the compound is zero. There are rules to be followed in naming compounds.

A chemical equation is a shorthand method of illustrating a chemical change in terms of symbols and formulas. Chemical equations are balanced based on the law of conservation of matter (mass) which states that matter (mass) is neither created nor destroyed. The number of atoms or moles of atoms of atoms of each element must be the same on both sides of the equation.

The simple types of chemical reactions are combination reaction, decomposition reaction, single-displacement reaction, and double-displacement reaction. Chemical equations for these reactions should be both complete and balanced. The balanced equation indicates the amounts of substances that react or form in a chemical reaction.

For the meantime, define or explain the following terms as part of our lesson today.

1. word equation

2. chemical equation

3. balanced chemical equation

4. reactant

5. law of conservation of mass

6. polyatomic ion

7. activity series

8. neutralization reaction

9. single-displacement

10. decomposition reaction

See you all in our synchronous learning later.

All the best.

Mr. Elmar Rubio

Secondary Science Teacher

Thanyaboon Boonkoed

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