SCIENCE7: Elements and Compounds
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This document provides information about elements and compounds. It begins by defining pure substances as either elements or compounds. Elements contain only one type of atom, while compounds contain two or more different types of atoms bonded together. Examples of common elements and their symbols are provided, along with their locations on the periodic table. Elements are also classified as metals, nonmetals, and metalloids. Examples of important compounds like water and their chemical formulas are also given. Students are then asked to classify substances as elements or compounds and answer multiple choice questions to assess their understanding of the key concepts.
SCIENCE7: Elements and Compounds
- 1. 11/27/2020 1 SCIENCE 7ELEMENTS AND COMPOUNDS
- 2. MELC #2 :Recognize that substances are classified into elements and compounds Quarter : 1 Week : 3 OBJECTIVES: A. Differentiates elements and compounds ; B. Classifies substances into elements or compounds; and C. Shows appreciation of the elements and compounds by giving an example.
- 3. 1.What have you observed in the picture? 4. Is it an element? Or a compound? Questions: 2. What are the gases present in air? 3. What type of pure substance is the gas you are referring to?
- 4. • Pure Substance are substances that are made up of only one kind of particles and has a fixed or constant structure. • Atom are building blocks of matter. • Molecule consists of two or more atoms of the same element, or different elements, that are chemically bound together. • Element contains only one kind of atom. • Compound contains two or more kinds of atom. TERMS TO REMEMBER:
- 5. ELEMENT Pure substance that cannot be separated into simpler substances by physical or chemical means. It consists of only one kind of atom. The chemical elements are divided into the metals, the metalloids, and the non-metals.
- 6. Elements are arranged in increasing atomic number across the periodic table presented above. PERIODIC TABLE OF ELEMENTS The periodic table shows 118 elements, including metals (blue), nonmetals (red), and metalloids (green).
- 7. MAJOR CATEGORIES OF ELEMENTS 1. Metals shiny , good conductors of heat and electricity, malleable (can be hammered into thin sheets), ductile ( can be drawn into thin wires). Examples : Iron (Fe) , Copper (Cu) 2. Nonmetals dull , poor conductor of heat and electricity , brittle and unmalleable. Examples: Neon (Ne) , Bromine (Br) 3. Metalloids have properties of both metals and nonmetals. Examples: Silicon (Si) , Boron (B)
- 8. ELEMENT SYMBOL USES Oxygen O This is the gas that everyone needs for breathing. Carbon C It is used for fuel and as a lead of pencils which are very essential to students. Iron Fe This is used in making appliances , utensils and building supports . Chlorine Cl This is used as a disinfectant, mostly used as a cleaning material. Hydrogen H It is an element needed to produce water. Calcium Ca It is the mineral that makes up bones and teeth. Iodine I This is needed to maintain thyroid gland. ELEMENTS THAT ARE USED IN DAILY LIFE
- 9. COMPOUNDS Pure substance that can be broken down into a simpler type of matter (elements) by chemical means . It consists of atoms of two or more different elements bound together.
- 10. Definite Composition of Compounds A molecule of a compound has a definite number of atoms. Consider the elements of hydrogen and oxygen. If one atom of oxygen and two atoms of hydrogen combine, the resulting compound is water . This is the most important compound in the universe.
- 11. COMPOUNDS SYMBOL USES Water It is used for drinking, cleaning, washing, cooking and other activities. Sodium Chloride It is use to give flavor to our food. Calcium Carbonate It is used as a building material and a component of mortar. Hydrochloric Acid It is an acid found in the stomach. It primarily aids digestion. Compounds that are used in daily life
- 12. I. Classify the following substances below. State if it is an element or compound. Element 1. Nitrogen (N) 2. Ammonia (NH3)Compound 3. Water (H2O)Compound 4. Carbon (C)Element 5. Tin (Sn)Element 6. Silver (Ag)Element 7. Carbon dioxide (CO2)Compound
- 13. LET’S WRAP IT UP! II. MULTIPLE CHOICE: Underline the correct answer. 1. It is a good conductor of electricity. a. Non-metals b. Metals c. Metalloids d. Compounds 2. It has a property of both metals and non-metals. a. Non-metals b. Metals c. Metalloids d. Compounds 3. It contains only one kind of atom. a. Elements b. Compounds c. Molecules d. Metals 4. It is an acid found in the stomach. It primarily aids digestion. a. Calcium carbonate b. Citric acid c. Sodium chloride d. Hydrochloric acid
- 14. September 21, 2020 OUTPUT #1: GIVE ME FIVE… Using short bondpaper in a table format, give at least five (5) examples of elements and compounds found at home and give its uses. Submit it on Friday, September 25, 2020 @ 02:00 PM in Google Classroom. Using short bondpaper in a table format, give at least five (5) examples of elements and compounds found at home and give its uses. Submit it on Tuesday, September 29, 2020 @ 08:00 – 04:00 PM here in school. Sir Christian LET’S BRING IT HOME: ONLINE MODULAR
- 15. ONLINE/MODULAR: TASK: Using Venn Diagram, compare and contrast elements and compounds. For online, use short bondpaper and submit it on Friday, September 25, 2020 in the Google Classroom. For modular, use short bondpaper and submit it on Tuesday, September 29, 2020 here in school. LET’S DEEPEN MORE :