Unit 3 Lesson 2: Chemical Reactions Please Complete an Audio Setup Grab you SUPER FANTASTIC Science Notebook! Review for Unit 3 Lesson 1: Bonding What type of bond share electrons? What type of bond gain and loses electrons? What are the outer energy level electrons called?
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Objectives O Students will be able to O Explain how reactants enter into chemical reactions that results in products. O Recognize that chemical reactions may involve the formation of a precipitate, the generation of a gas, or a change in color. O Explain the difference between an exothermic and endothermic reaction.
Beautiful Chemistry O Click on the video link below and watch the video. O http://vimeo.com/107976057 O I will call you back after 2 minutes O What did you like from the video?
What do you think a chemical reaction is?
Chemical Reactions O Chemical reaction: the process by which one or more substances change to produce one or more different substances. O The process of breaking and forming bonds.
Parts of a Chemical Reaction O Reactants: the starting molecules in a chemical reaction. O Substances that react together O Products: the molecules that result from a chemical reaction. O What is produced in the reaction C 3 H 8 + 5O 2 3CO 2 + 4H 2 O Reactants Products What type of change took place? The chemical reaction produced new compounds (products) with different properties than the compounds in the reactants!
Chemical Reactions Exothermic Reaction: A chemical reaction in which energy (heat) is released. *Hint-Think of the word Exit. Endothermic Reaction: A chemical reaction that requires energy (heat is absorbed). *Hint-Think of the word Enter. Exo means go out or exit Thermic means heat or energy Temperature goes UP during a chemical reaction! Endo means go in Thermic means heat or energy Temperature goes DOWN during a chemical reaction! Example: Example: 2Na + Cl 2 2NaCl + ENERGY 2H 2 O + ENERGY 2H 2 + O 2
Which chemical reaction is it? O Click on the link below to watch a video. O http://safeshare.tv/w/xxkmuxhegx O Think about what type of reaction it is and how do you know it is a chemical reaction taking place. O Give me a green check when you are finished watching the movie!
What did you observe?
Combustion O Combustion Reaction: an exothermic reaction in which oxides are usually formed. O We get energy from fuels as the result of combustion reactions. What happens to the temperature during a combustion reaction? A.) Temperature increases B.) Temperature decreases Use Polling Tools! A combustion reaction is an exothermic reaction. Is energy A.) Absorbed B.) Released
Decomposition Reaction O Decomposition reaction: a kind of chemical reaction in which a single compound is broken down into two or more simpler compounds. O Example: O H 2 O + ENERGY H 2 + O 2
Hint: Look for a NEW substance being produced to identify if it is a chemical reaction. Solid Formation (precipitate) *Precipitate: is a solid substance produced as a result of a chemical reaction in a solution. Signs of Chemical Reactions Color Change Gas Formation (gas/bubbles)
Activity Time! O Get ready to use your observational skills! O Click on the video link below: O http://safeshare.tv/w/gdrvcqngeh O Make some observations and be ready to share when we return. O Give me a green check when you are finished watching the movie
What did you observe?
When you open a pop it might fizz. Is that an example of a chemical reaction taking place? Why or why not?
Here are some of the fun activities: Chat room Whiteboard room Word Searches Checkers Sudoku Puzzles Tic Tac Toe Web Cam How can you be invited? Complete 10 questions in all 4 of your Science topics in Study Island by October 30 th (4pm).
Exit Ticket! O Click on the link below and answer the questions. Remember to try your best! This gives us a quick snapshot of how you are doing with the lessons taught today It also is how I am taking attendance! O https://docs.google.com/forms/d/1myzns9uw1s5ug 5yUp-0wxKGF3DFwT- HDI_iJwU_GmQ0/viewform?usp=send_form O When you are finished submitting the Exit Ticket, you may leave class Go and take Unit 3 Lesson 2 Chemical Reactions assessment in the OLS. Have a wonderful day! O If you have questions raise your hand!