General Chemistry Module 1 quarter 1, Summaries of Earth science

Download General Chemistry Module 1 quarter 1 and more Summaries Earth science in PDF only on Docsity! General Chemistry 1 Quarter 1 - Module 2: Chemical Formula of Common Chemical Substances What I Need to Know? This module was prepared to direct you on how to interpret the meaning of a given chemical formula as well as to become familiar with the chemical formula of common chemical substances. Knowing the chemical formula of a certain substance, we could explain the composition and the characteristics of that substance. In addition, familiarization on the chemical formula of common substances, we could easily understand the information written on the food and other product labels. In this manner, we could avoid a danger or misused of products due to lack of familiarization to some chemical formulas. One danger could be allergic reaction if a person took a medicine containing a component that is said to be allergen to that person. The scope of this module covers many different learning situations where students could relate their personal experiences on different samples of matter. 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. After going through this module, you are expected to: 1. recognize the formulas of common chemical substances, (STEM_GC11Mpla-b-9). What I Know? (Critical Thinking) To check your prior knowledge about the topic, and to solicit the questions that you want to know about it, fill in the Know and Want to know components of the Know- Want to know- Learned (KWL) chart properly and correctly. For the Know component, you may write word/s or sentence. For the want to know component, state your responses in interrogative or question form. You may list as many responses as you want for each component. Write your responses on a separate sheet of paper. KWL Chart Topic Know Want to know Learned Chemical Formula lool What’ s New? SJ Communication 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. HOLD ON AMIGO!!! DIRECTION: After finding out the meaning of important terms that you will encounter as you read the next part, make time to read the characteristics of the particles below thoroughly. 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. 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. For example, COz is the chemical formula of a substance known as carbon dioxide. But what does this CO2 formula mean? What information can we get from this formula? In this substance based from its formula of COz, the said substance is made up of two types of atoms, these are carbon and oxygen. This is because the formula has two different letters that are written in capital form; C and O. The capital letter is known as chemical symbol that represents a certain substance known as element. Let us use the periodic table below to determine the chemical symbol of the elements. Periodic Table of the Elements Atomic Sailr Point Number 7 8 VIB — 78 25) St 25: i a7: Mn Fe ‘Caton | Sloan seed abe ae ay 4B OS 4g OP a5 “Zr Nb Zirconium Niobium ‘204 pd Tc Ru Technetim Ruthenium ‘oa 30807 x sas 7p “Hf Ta ‘ Re "Os Hatin Tanwalum = Tungsten © Rherium = Osmium ‘sium Platinum Gold 178g wos 185 186207 39023 12 1508 156967 104, thom 195 elrmen 195 stew 497 vdmown 198 anise 19g, tlre 3 snow 41 row Rf Db Sg Bh Hs Mt Ds Rg Rutherordiom — Sutnium Seabed —Betvium =———Hassium Demat Reertgirnm ee be gh eo vas we sg 5 60) GL im om 65 ae 67 we eg i 7007 “rt GER seme rome) mae amine (©7014 Tod Hemerstine eiceotescrg Carbon dioxide molecule Oxy men Carbon Oxygen atom atom atom Molecular Structure of CO2, 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 CO2, since C is the first letter of the chemical formula, the C which is the carbon atom is the central atom. If the letter is the chemical symbol that represents an element, the subscript represents the number of atom in the chemical formula. In CO2, the subscript of oxygen is 2 while carbon is 1. Even though there is no number 1 indicated after letter C in COg, it is presumed that there is one. So the number after the letter refers to its number of atoms. Chemical Formula of Carbon dioxide So let us take HCl as another example. Determine the atoms represented by chemical symbols that make up the formula, and determine the number of each atom. What I Can Do? (Character and. Creativity) WORK IN PROGRESS You may choose to any of the added task to you. 1. Research on the active ingredient or chemical present in plant extract found in the Philippines that has antiseptic property. Determine the chemical formula of the active ingredient. 2. Formulate a right formula to successful life? How about to covid-free life? HOLD ON AMIGO!!! Congratulations Mi Amigo! You are almost done in this lesson. Let us do the last part which is the assessment. Assessment (Critical Thinking) FORMATIVE ASSESSMENT A. Sentence Completion. Complete each statement with a word/ concept in the blank of the item. 1. is shorthand of expressing the types and the number of atoms present in a substance. 2. The chemical symbol of carbon is 3. There is/are __ nitrogen atom/s present in this chemical formula NHs. 4. O is the chemical symbol for . 5. There is/are_____—shhydrogen atom/s in C6Hi206. 10 B. Identification. Determine the common name, the types and number of atoms, and the molecular structure of the given chemical formula in each item. Chemical Common Type of Number Molecular Structure Formula Name Atoms of Each Atom 1. CaCOzs 2. CaO 3. CoHsOH HOLD ON AMIGO!!! Congratulations Mi Amigo!!! We are done in this module. You may now proceed to the next module. See you next time. 11 REFERENCES Mendoza E. and Religioso T. (2008). Chemistry Laboratory Manual. Phoenix Publication Mendoza E. (2003). Chemistry Textbook. Phoenix Publication Acknowledgements Writer: Gary R. Ramos, MAT-GS Editors: Ma. Teresa M. Chico- PSDS, Rosalina Aranzamendez- PSDS and Ma. Victoria Santos- PSDS Reviewers: Amalia C. Solis- EPS, Rebecca M. Roxas- EPS and Lucita A. Gener- EPS Management Team: Maria Magdelema M. Lim- Schools Division Superintendent- Manila, Aida H. Rondilla- Chief Education Supervisor, Lucky S. Carpio- EPS and Lady Hannah C. Gillo, Librarian Il- LRMS 12