Chemical-Formula-1.pptx chemical formula

this is chem

1. Chemical Formula of Common Chemical Substances

2. Learning Competency After going through this module, you are expected to: 1. recognize the formulas of common chemical substances, (STEM_GC11Mp1a-b-9) .

3. PRE-TEST A. Sentence Completion. Complete each statement with a word/ concept in the blank of the item. 1. The chemical symbol of oxygen is _____. 2. There is/are ____ hydrogen atom/s present in this chemical formula C 6 H 12 O 6 . 3. _____ is shorthand of expressing the types and the number of atoms present in a substance. 4. C is the chemical symbol for ______. 5. There is/are _____ oxygen atom/s in H 2 O.

4. LET US HAVE SOME FUN! Picture Analysis . Analyze the picture below then answer the corresponding guide questions. Guide Questions 1. What is the picture all about? Why? 2. Which substance is being represented by that structure? (Clue: It is the universal solvent) 3. What is the formula of that universal solvent? Explain your answer.

5. IMPORTANT VOCABULARY WORDS Read the description of important terms that you will encounter in this module. VOCABULARY WORD MEANING 1. Subscript A small number written at the lower right corner of a chemical symbol . 2. Chemical symbol An abbreviation that represents the name of an element .

6. What is a Chemical Formula? Chemical Formula If we are to study the meaning of chemical formula, two words are involved namely chemical and formula . Chemical refers to a compound or substance while formula refers to the symbolic expression. Thus, a chemical formula is a symbolic expression of a compound or substance. It is also described as shorthand of expressing the types and the number of atoms in a substance.

7. What is the Meaning of a Given Chemical Formula? Once again, chemical formula is the shorthand of expressing the types and the number of atoms in a substance. Example: CO 2

8. Molecular Structure of CO 2

9. The chemical formula also tells the number of each type of atom and the central atom of the molecule specifically if it is not a diatomic molecule. The first chemical symbol written at the right side of the formula tells us that it is the central atom, or the atom located at the center of the molecule. So, for CO 2 , since C is the first letter of the chemical formula, the C which is the carbon atom is the central atom.

10. If the letter is the chemical symbol that represents an element, the subscript represents the number of atom in the chemical formula. In CO 2 , the subscript of oxygen is 2 while carbon is 1. Even though there is no number 1 indicated after letter C in CO 2 , it is presumed that there is one. So the number after the letter refers to its number of atoms.

11. Chemical formula for Carbon dioxide

12. Activity 1 – Chemical Formula and Molecular Structure Procedure 1. Determine the common name, the types and number of atoms, and the molecular structure of the given chemical formula in each item. 2. Fill-in the table with correct information.

13. Data and Results Chemical Formula Common Name Type of Atoms Number of Each Atom Molecular Structure 1. NaCl 2. NH 3 3. CH 4 4. NaOH 5. CH 3

14. You have to fill in the L component of the KWL chart to generalize the things they have learned about the topic. Topic Know Want to know Learned