7 SCIENCE First Quarter – Module 2A Elements Department of Education ● Republic of the Philippines Science – Grade 7 Alternative Delivery Mode First Quarter – Module 7: ELEMENTS First Edition, 2020 Republic Act 8293, Section 176 states that: No copyright shall subsist in any work of the Government of the Philippines. However, prior approval of the government agency or office wherein the work is created shall be necessary for exploitation of such work for profit. Such agency or office may, among other things, impose as a condition the payment of royalties. Borrowed materials (i.e., songs, stories, poems, pictures, photos, brand names, trademarks, etc.) included in this module are owned by their respective copyright holders. Every effort has been exerted to locate and seek permission to use these materials from their respective copyright owners. The publisher and authors do not represent nor claim ownership over them. Published by the Department of Education – Region 10 Regional Director: Dr. Arturo B. Bayocot, CESO III Assistant Regional Director: Dr. Victor G. De Gracia Jr., CESO V Development Team of the Module Author: Cheyenne Errf D. Uy Reviewers: Marisol P. Moreno Norlyn Q. Lobido Rizza Mae L. Serino Evaluators: Marissa R. Bueno Marissa M. Olarte Carmen S. Madrio Illustrator and Layout Artist: Management Team Chairperson: Co-Chairpersons: Pearl Mhar Pargan Dr. Arturo B. Bayocot, CESO III Regional Director Dr. Victor G. De Gracia Jr. CESO V Asst. Regional Director Edwin R. Maribojoc, EdD, CESO VI Schools Division Superintendent Myra P. Mebato,PhD, CESE Assistant Schools Division Superintendent Mala Epra B. Magnaong, Chief ES, CLMD Members Neil A. Improgo, EPS-LRMS Bienvenido U. Tagolimot, Jr., EPS-ADM Samuel C. Silacan, EdD, CID Chief Maritess A. Caguindangan, EPS - Science Rone Ray M. Portacion, EdD, EPS – LRMS Asela I. Elumbareng, EdD, PSDS Nelia T. Lanzaderas, PhD, Principal III/District In-charge Agnes P. Gonzales, PDO II Vilma M. Inso, Librarian II Printed in the Philippines by Department of Education – Region 10 Office Address: Zone 1, DepEd Building, Masterson Avenue, Upper Balulang, Cagayan de Oro City Contact Number: (088) 880 7072 E-mail Address: region10@deped.gov.ph 7 Science First Quarter – Module 2A Elements This instructional material was collaboratively developed and reviewed by educators from public schools. We encourage teachers and other education stakeholders to email their feedback, comments, and recommendations to the Department of Education – Region 10 at region10@ deped.gov.ph. Your feedback and recommendations are highly valued. Department of Education ● Republic of the Philippines Table of Contents What I Need to Know ---------------- 1 What I Know ---------------- 2 ---------------- 4 What’s In ---------------- 4 What’s New ---------------- 5 What Is It ---------------- 6 Element Defined ---------------- 6 Properties of Elements ---------------- 7 Physical Properties ---------------- 8 Chemical Properties --------------- 8 What’s More ---------------- 9 What I Have Learned - - - - - - - - - - - - - - - - 10 What I Can Do - - - - - - - - - - - - - - - - 10 Assessment - - - - - - - - - - - - - - - - 11 Additional Activities - - - - - - - - - - - - - - - - - 14 Answer Key - - - - - - - - - - - - - - - - - 15 References - - - - - - - - - - - - - - - - - 16 Elements iv Introductory Message For the learner: Welcome to the Science 7 Alternative Delivery Mode (ADM) Module on ELEMENTS! The world abounds with wonderful and various materials which are of great use to mankind. These materials came into existence due to their unique set of composition and identity. What comprise these materials? This question will be answered as you unfold the mysteries of the materials around you. Get ready as this lesson let you feel the essence of the components of these materials that you are already utilizing at home, in school, and in your entire neighborhood. This module was designed to provide you with fun and meaningful opportunities for guided and independent learning at your own pace and time. You will be able to process the contents of this learning resource by being an active learner. This module has the following parts and corresponding icons: What I Need to Know This gives you an idea of the skills or competencies you are expected to learn in the module. What I Know This part includes an activity that aims to check what you already know about the lesson to take. If you get all the answers correct (100%), you may decide to skip this module. What’s In This is a brief drill or review to help you link the current lesson with the previous one. What’s New In this portion, the new lesson will be introduced to you in various ways such as a story, a song, a poem, a problem opener, an activity or a situation. What is It This section provides a brief discussion of the lesson. This aims to help you discover and understand new concepts and skills. What’s More This comprises activities for independent practice to solidify your understanding and skills of the topic. You may check the answers to the exercises using the Answer Key at the end of the module. v What I Have Learned This includes questions or blank sentence/paragraph to be filled in to process what you learned from the lesson. What I Can Do This section provides an activity which will help you transfer your new knowledge or skill into real life situations or concerns. Assessment This is a task which aims to evaluate your level of mastery in achieving the learning competency. Additional Activities In this portion, another activity will be given to you to enrich your knowledge or skill of the lesson learned. This also tends retention of learned concepts. Answer Key This contains answers to all activities in the module. At the end of this module you will also find: References This is a list of all sources used in developing this module. The following are some reminders in using this module: 1. Use the module with care. Do not put unnecessary mark/s on any part of the module. Use your Science notebook in answering the exercises. 2. Don’t forget to answer What I Know before moving on to the other activities included in the module. 3. Read the instruction carefully before doing each task. 4. Observe honesty and integrity in doing the tasks and checking your answers. 5. Finish the task at hand before proceeding to the next. 6. Return this module to your teacher/facilitator once you are through with it. If you encounter any difficulty in answering the tasks in this module, do not hesitate to consult your teacher or facilitator. Always bear in mind that you are not alone. We hope that through this material, you will experience meaningful learning and gain deep understanding of the relevant competencies. You can do it! vi What I Need to Know This module was carefully crafted and written with you in mind. It is here to aid you master the basics of Chemistry. The scope of this module allows it to be utilized in many various learning situations. The language used anticipates the diverse vocabulary level of learners. The lessons are carefully arranged to follow the standard sequence of the course. But the order in which you read them can be changed to coincide with the textbook you are now handling. After going through this module, you are expected to recognize substances as elements and compounds. (S7MT-Ig-h-5) Specifically, you are also expected to: 1. identify materials which contain elements; and 2. describe elements based on physical and chemical properties. 1 What I Know Instructions: Choose the letter of the best answer. Write the chosen letter in your Science notebook. 1. The pure substance that cannot be broken down into simpler ones are called ______________. A. compounds B. elements C. mixtures D. solutions 2. Which of the following is a physical property of an element? A. color B. flammability C. stability D. toxicity 3. Which of the following is a chemical property of an element? A. acidity B. mass C. shape D. volume 4. Which of the following substances is an element? A. candle wax B. cookies C. cooking oil D. Copper 2 5. What are elements made of? A. atoms B. compounds C. dust particles D. gases 6. Which characterizes a luster property of an element? A. resistant C. easily burnt B. poisonous D. shiny appearance 7. Which property of an element refers to the amount of space it may occupy? A. color C. shape B. oxidation D. volume 8. Which can be considered as a form of matter? A. energy B. ice C. light D. shadow 9. What compose an element? A. many molecules B. Neutron C. one kind of atoms D. Proton 10. Which property of an element that refers to its ability to be burnt easily? A. acidity B. flammability C. toxicity D. volume 3 Lesson ELEMENTS 1 Elements as pure substances exist as unique materials in our planet since these peculiar forms of matter already have their own set of properties and compositions that do not change from one sample to another. What’s In Directions: Try to arrange the following jumbled names of elements. The descriptions provided below will help you unlock this task. Write your answers in your Science notebook. RNIO 1. considered as king of metals since it is first used in ancient times XYNEGO 2. the gas of life responsible for life to exist CLCMUAI 3. the element that comprises the bones and teeth NNOE 4. used widely in advertising signs DLOG 5. used to make jewelries MRRCYEU 6. found on thermometers 4 CRABNO 7. found in all living organisms SDMUIO 8. combines with chlorine to make salt HLOCNERI 9. used in bleaches and purifying pools MNMULUAI 10. used in kitchen utensils What’s New Activity 1: The Not-So-Long Story of Elements! Directions: Below is a story where there are names of elements. List them one at a time on your notebook as your guardian will read to you the entire story. Hand over your list to your teacher for verification. “The Birth of the Elements” Long time ago, there lived two elements named Iron and Oxygen that came from the Earth below and heavens above. Their love was so great that Oxygen gave birth to other elements to sustain human life. Gold came first followed by Nitrogen. That did not end the giving of new birth as the twins, Hydrogen and Helium, came third. Mercury, Silver, Lead, Platinum, Zinc, Carbon, and Cobalt came next. This made the couple happy as they saw how their offspring elements help mankind. This wonderful unity between them and humans throughout the years led them to decide to produce more elements. Chlorine, Iodine, Silicon, Phosphorus, Selenium, Nickel, Copper, Tungsten, Titanium, Magnesium, Potassium, and Argon came out from this union. The others came after as the centuries went on and made the couple very satisfied of their existence on Earth. 5 What is It Element Defined Take a look on the pictures below and keenly observe each. What have you noticed? Figure 1. Knife Figure 2. Sauce Pan Figure 3. Kitchen Utensils 6 The pictures are materials that contain elements. How do you know if a substance is an element? An element is a pure substance that cannot be broken down into simpler substances but can be chemically combined with one another to produce another substance. This makes elements as a homogenous example of matter. Meaning when you cut a nail into pieces, it will still be a nail that is made up of iron. This makes element as the main building block of matter. Properties of Elements Elements could either have physical and chemical properties. To show distinction of elements found either free in nature or artificial, here are some of its physical and chemical properties as pure substances. Table 1. Some Properties of Elements Physical Chemical Luster Flammability Volume Oxidation Color Toxicity Mass Acidity Shape Stability When you say physical, this is a property that can be readily observed through the human senses. Examples were shown on Table 1 wherein one can easily notice such attributes by just seeing and manipulating, thus acquiring these qualities without altering or changing their composition. With the use of your sense organs, you can easily identify these properties. Chemical properties on the other hand are those properties that can be attained once an element undergoes change in composition such as burning. 7 Physical Properties of Elements 1. Luster-shiny in appearance 2. Volume- amount of space occupied by an object 3. Color-the aspect of the appearance of objects and light sources 4. Mass-the amount of material it contains 5. Shape-appearance or form of a sample matter Chemical Properties of Elements 1. Flammability-ability to be burnt easily or undergo combustion 2. Oxidation-to be rusted or being oxidized and form oxides 3. Toxicity-the relative degree of being poisonous 4. Acidity-the state of being acidic by nature 5. Stability-resistance to chemical change or to physical disintegration Pictures of Some Elements Lead Zinc Source: https://images-of-elements.com/lead.php, 2016 Source: https://www.ironmountainhotsprings.com/mineral-spotlight-zinc/, 2016 8 What’s More Activity 2: The Property Challenge! Directions: Below are statements where elements are involved as well as properties. Identify the property involved in each item. You may choose from the box for your answer. Write your answers in your Science notebook. Luster Flammability Color Oxidation Mass Toxicity Shape Acidity Volume Stability 1. Chlorine gas appears to be green-yellow in appearance. 2. A group of Grade 7 learners were able to measure 0.30 g of iron filings. 3. Zinc particles change from hexagonal to spherical formation. 4. Lead causes disorder to the digestive system in humans. 5. Iron grills rusted after a decade of usage. 6. Magnesium metal easily undergoes burning in a laboratory experiment. 7. A sodium sample was found out to occupy 0.968 per cubic centimeter. 8. Barium isotopes have the most stable half-life. 9. Rhodium is a very valuable metal that is commonly used for reflective purposes due to its shining appearance. 10. Sulfur is acidic by nature as an element. 9 What I Have Learned Directions: Identify the term/s being referred to in each blank. Choose from the box your answer. You may use a term twice. Write your answer in your Science notebook. An ______________ is a substance that cannot be broken down into simpler substances by any ___________ process. _________ are considered as the building blocks of matter. Elements could either have __________ and __________ properties. ___________ properties can be readily observed by the human sense while ________ properties can be observed when the _________ is changed. Examples of physical properties are _________, ___________, ________, _______, and ________ while for chemical properties are _________, _______, ___________, ___________, and __________. color oxidation element elements shape toxicity volume luster stability physical mass flammability acidity stability chemical 10 What I Can Do Activity 3 Sketching Time! Directions: Find 10 objects that are present inside your house that you think are made up of elements and identify what elements they may contain. Draw them in your Science notebook and place the names of the elements below your drawing. 11 Assessment Directions: Answer the questions given below by writing the letter of the correct answer in your Science notebook. 1. An element is defined as ________________. A. a uniform substance B. a substance with a constant composition C. a substance that contains two or more substances in definite proportion D. a substance that cannot be separated into two or more substances by ordinary or chemical means 2. The silvery liquid used inside thermometers is what we call as mercury. Mercury is an example of ___________. A. a mixture B. a solution C. an element D. a compound 3. What property of an element is shown when a Grade 7 learner reported to his teacher that he uses 0.40 g of sodium crystals in his experiment procedure? A. acidity B. color C. mass D. toxicity 12 4. Which of the following substances in an example of an element? A. fruit salad B. ice candy C. iron nail D. spaghetti 5. All of the following substances are considered EXCEPT_________. A. gelatin B. gold ring C. iron grills D. neon lights 6. Which substances contain elements in its composition? A. nail, spoon, and fork B. milk, salt, and bananas C. ring, orange juice, and seafood D. all of the above 7. Which property refers to an element’s shiny appearance? A. acidity B. luster C. malleability D. oxidation 8. Which property refers to element’s capacity to be burnt easily? A. color B. flammability C. mass D. toxicity 13 elements 9. A student found out in her research that mercury can be poisonous in larger amounts but this element is naturally occurring and is taken in small quantities specially in seafood. What property of the element is being referred to in this item? A. acidity B. color C. flammability D. toxicity 10. Which property refers to element’s amount in material it contains? A. mass B. shape C. stability D. volume 14 Additional Activities Activity 4: The Fantastic Element Brochure! Directions: You are to create a very eye-catching brochure in your Science notebook about your chosen element. The brochure should be bi-fold and should be something others would like to read. This brochure must include the following information: 1. name of element 2. symbol, atomic number, and atomic mass 3. where it’s found and in what form 4. physical facts like density, melting point, boiling point, and abundance in the Earth’s crust 5. uses and applications 6. sources of the information you had gathered Congratulations my dear! You have successfully completed Module 2A. You may now proceed to Module 2B and learn more on elements using the Periodic Table. 15 Assessment 1. D What’s More What’s More 1. element 1. Color 2. chemical 2. Mass 3. element 6. color 4. C 5. chemical 3. C 4. physical 2. C 3. Shape 4. Toxicity 5. Oxidation 7. mass 10. luster 7. B 9. volume 6. D 8. shape 5. A 6. Flammability 7. Volume 8. Stability 11. stability 14. acidity 10. A 13. flammability 9. D 12. toxicity 8. B What‘s New 16 9. Luster 10. Acidity What‘s New 21. Tungsten 22. Titanium 23. Magnesium 24. Potassium 25. Argon 15. oxidation What’s New What’s In What I Know 10. B 10. Aluminum 9. C 9. Chlorine 8. B 8. Sodium 8. Silver 7. D 7. Carbon 7. Mercury 17. Phosphorus 6. D 6. Mercury 6. Helium 16. Silicon 5. Gold 5. Hydrogen 15. Iodine 4. D 4. Neon 4. Nitrogen 14. Chlorine 3. A 3. Calcium 3. Gold 13. Cobalt 2. A 2. Oxygen 2. Oxygen 12. Carbon 1. B 1. Iron 1. Iron 11. Zinc 10. Platinum 20. Copper 9. Lead 19. Nickel 18. Selenium 5. A Answer Key References Book Resources Bibliography Felicerta, Corazon N. Breaking Through Science 7. Quezon: C and E Publishing Inc., 2013. Laurente, Jomar Aries. Science for the 21st Century Learner 7. Quezon: University Press of First Asia, 2015. Science 7 Learner's Material. Pasig: Department of Education, 2017. Electronic Resources No author, Images-of-elements.com/lead.php, March 5, 2016, https://images-of-elements.com/lead.php, Accessed June 24, 2020 Gene Stowe, Ironmountainhotsprings.com, May 10, 2016, https://www.ironmountainhotsprings.com/mineral-spotlight-zinc/, Accessed, June 24, 2020 17 For inquiries or feedback, please write or call: Department of Education – Region 10 Zone 1, DepEd Building Masterson Avenue, Upper Balulang Cagayan de Oro City, 9000 Telefax: (088) 880 7072 E-mail Address: region10@deped.govph 18
