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During this Unit
This unit focuses on the relationship of matter and energy in chemical reactions. Students will relate the chemical bonding behaviors explored in the Elements of the Periodic Table unit to demonstrate conservation of mass during chemical reactions. While the TEKS do not explicitly mention balancing chemical reactions, the skill is a way to demonstrate mastery of TEKS I.7C. Students classify chemical reactions based on the energy released or absorbed. The illustrative examples provided for students to research and describe the impact of chemical reactions focus on negative environmental impacts.
Misconceptions:
Students may think when chemical change occurs, the atoms change, rather than the arrangement of atoms within molecules.
Underdeveloped Concepts:
Students may not understand covalent and ionic bonds.
Students may confuse nuclear and chemical reactions.
Key Content Vocabulary:
Endothermic reaction – type of reaction that absorbs thermal energy from the environment
Exothermic reaction – type of reaction that releases thermal energy into the environment in the form of thermal or light energy
Law of conservation of mass – matter is not created or destroyed; only rearranged
Product – substance resulting from a chemical reaction
Reactant – substance that are combined and changed during a chemical reaction
Valence electrons – electrons located in outer energy level (electron shell)
Related Vocabulary:
Applications
Chemical equation
Coefficient
Covalent bond (molecule)
Energy change
Ionic bond
Subscript
Substance
Yield arrow
https://www.teksresourcesystem.net/module/content/search/item/693405/viewdetail.ashx
Editable PowerPoint - Chemical Bonds and Equation