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# Grade 9 Science Module: Percentage Composition of Compounds

This Self-Learning Module (SLM) is prepared so that you, our dear learners, can continue your studies and learn while at home. Activities, questions, directions, exercises, and discussions are carefully stated for you to understand each lesson.

Each SLM is composed of different parts. Each part shall guide you step-by-step as you discover and understand the lesson prepared for you.

Pre-tests are provided to measure your prior knowledge on lessons in each SLM. This will tell you if you need to proceed on completing this module or if you need to ask your facilitator or your teacher’s assistance for better understanding of the lesson. At the end of each module, you need to answer the post-test to self-check your learning. Answer keys are provided for each activity and test. We trust that you will be honest in using these.

Please use this module with care. Do not put unnecessary marks on any part of this SLM. Use a separate sheet of paper in answering the exercises and tests. And read the instructions carefully before performing each task.

If you have any questions in using this SLM or any difficulty in answering the tasks in this module, do not hesitate to consult your teacher or facilitator.

This module is designed and written with you in mind. It is here to help you master Percentage Composition of Compounds. The scope of this module permits it to be used in many different learning situations. The language used recognizes the diverse vocabulary level of students. The lessons are arranged to follow the standard sequence of the course, but the order in which you read them can be changed to correspond with the textbook you are now using.

The module focuses on achieving this learning competency:

• Determine the percent composition of a compound given its chemical formula and vice versa.

After going through this module, you are expected to:

• determine the percentage composition of each element in a given compound;
• differentiate empirical from molecular formula;
• calculate for the empirical formula of a compound given its percentage composition; and
• calculate for the molecular formula of a compound given its percentage composition.

## Grade 9 Science Quarter 2 Self-Learning Module: Percentage Composition of Compounds

Science-9_Q2_Mod8_PERCENTAGE-COMPOSITION-OF-COMPOUNDS_VerFinal

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## Are you taking the March 2022 National Qualifying Examination for School Heads (NQESH)?

Join this year’s review sessions and let us equip you with the knowledge to hurdle the difficult test that will be your passport towards your dream of becoming a school head to fill the many vacant Principal I items in the country.