Chemical Bonding - Worksheet (1).pdf

Maria Montessori Children’s School ADOLESCENT PROGRAM CHEMISTRY 9 CHEMICAL BONDING The modern periodic table organizes element...

Maria Montessori Children’s School ADOLESCENT PROGRAM CHEMISTRY 9 CHEMICAL BONDING The modern periodic table organizes elements in such a way that information about the elements and their properties are easier to understand and remember. For example, the vertical column of the periodic table is called group, elements in the same group share common properties. Directions: Classify the list of elements from the first box below according to the group where they belong to complete the list of elements in the second box. Use the chemical symbol of the element in answering. You may use your own periodic table of elements or one that you can find online. _________________________________________________________________________________________________ Getting to Know Chemical Compounds Most elements bond with other elements to form chemical compounds. The table below shows the list of commonly used chemical compounds. Directions: Identify the name of elements involved in the given compound and determine whether the elements are metal or non-metal. Answers for number one is provided as an example. Again, you may use your own periodic table of elements or one that you can find online. Guide Questions: 1. How do compounds form? ________________________ ________________________ ________________________ 2. What does a compound contain? ________________________ ________________________ ________________________  Let’s Bond with Ionic and Covalent Compounds! Compounds play a big part in our everyday life, like for example, you can find compounds present in food, air, cleaning chemicals, and literally in every object that you can see or touch. Compounds are made up of elements that are chemically bonded by electrostatic forces. Compounds can be classified as ionic or covalent. An ionic compound is formed when metal (cation) transfers its valence electron/s to a nonmetal (anion). (metal and nonmetal) The covalent compound is formed when nonmetals share their valence electrons with another nonmetal. (both or all nonmetals) The figure below shows an illustration on how each element transfer or share their valence electrons to attain stability. _________________________________________________________________________________________________ Identifying and Describing Compounds through its Chemical Formula and Chemical Name Ionic and covalent compounds can be identified and described through their chemical formula and name by observing the types of elements involved in a compound. In chemistry, the chemical formula is a symbolic expression signifying the number of atoms present in a molecular substance. We determine the type of atom by referring to its chemical symbol. The number of atoms is determined by the subscript attached to the symbol. On the other hand, chemical name shows the name of each element involved in a compound. For example, carbon dioxide, the chemical formula is written as CO2. This means that this is an example of a covalent compound, since the elements involved are nonmetals, namely, one carbon atom and two oxygen atoms. Moreover, sodium chloride, which chemical formula is written as NaCl is an example of an ionic compound. Since the elements involved in a compound are sodium (Na) a metal and chlorine (Cl) a nonmetal. Look at your answers in the table of compounds in the Getting to Know Chemical Compounds part. Which among the given compounds do you think can be classified as ionic and covalent compounds based on their chemical formula and name? Try this! Directions: Study the list of compounds and its chemical formula below (left table). Complete the table by identifying the correct chemical formula for each chemical name and classifying each type of compound whether it is ionic or covalent.