Investigation IV Lesson 4

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Polar Bears and Penguins Lesson Guide: Investigation IV Lesson 4 Lesson Guide: Polar Bears and Penguins Investigation IV Lesson 4 In this lesson you will be exploring polarity and bonding between atoms
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Polar Bears and Penguins Lesson Guide: Investigation IV Lesson 4 Lesson Guide: Polar Bears and Penguins Investigation IV Lesson 4 In this lesson you will be exploring polarity and bonding between atoms in greater detail. A comic book will provide new information about these topics and will introduce you to the concept of electronegativity, which helps us to understand partial charges. Answer the following questions: Consider the following illustration: Draw the Lewis dot structure for HCl. If the penguin represents a hydrogen atom and the polar bear represents a chlorine atom, what does the ice cream represent in the drawing? What do you think the picture is trying to illustrate? Would HCl be attracted to the charged wand? Explain your thinking. Purpose: In this lesson you will be exploring polarity and bonding between atoms in greater detail. A comic book will provide new information about these topics and will introduce you to the concept of electronegativity, which helps us to understand partial charges. Use the comic book called The Bare Essentials of Polarity to answer the following questions. Smells UC Regents, LHS Living by Chemistry, Lesson Guide: Investigation IV Lesson 4 Polar Bears and Penguins 1. How does the comic book define a polar molecule? 2. Define electronegativity as you understand it, after reading the first two pages of the comic book. 3. Interpret the picture at the bottom of page 1. Explain how the iceberg, penguins, and polar bears represent trends in electronegativity. 4. What is the artist trying to represent when there are two polar bears arm wrestling together, or two penguins arm wrestling together? 5. What three types of bonds are represented on page 3 of the comic book? What happens to the bonding electrons in each type of bond? 6. Explain why there are four scoops of ice cream in the illustration of O 2 on page What do the six scoops of ice cream represent in the illustration of N 2 on page 4? 8. Describe what you think is happening to the penguin in the CO 2 molecule in the picture on page Name three things that the picture of CO 2 on page 4 illustrates about the molecule. 10. Describe what you think is happening to the penguins in the illustration of H 2 O on page Explain what you think the crossed arrow represents in the comic book. 12. What are the two definitions of dipole given in the comic book? Making Sense Question: What does electronegativity have to do with polarity? If you finish early... Using polar bears and penguins, create an illustration showing a hydrogen sulfide molecule, H 2 S. (Hint: You may wish to start with a Lewis dot structure.) 86 Smells UC Regents, LHS Living by Chemistry, 2003. Polar Bears and Penguins Lesson Guide: Investigation IV Lesson 4 When two atoms with different electronegativities are bonded together, they tend to attract the bonded electrons to different degrees. This causes the electrons to spend more time around one of the atoms, resulting in a partial negative charge on this atom. This tendency of an atom to attract electrons shared between two atoms is called electronegativity. An atom that strongly attracts the shared electrons is considered highly electronegative. The atom with lower electronegativity will end up with a partial positive charge on it. The result is a polar bond. Chemists have a specific name for a molecule that has two poles - it is called a dipole. Polar molecules are also called dipoles. The prefix di- means two. A dipole is a molecule with two partially charged ends, or poles. Chemists refer to polar molecules as dipoles and they also say that molecules with polar bonds have dipoles. These multiple definitions can be a bit confusing. Answer the following questions: HI molecule I H Is the bond between these atoms polar? Explain your reasoning. How would the atoms be portrayed in the comic book as polar bears, penguins, or both? Explain. Smells UC Regents, LHS Living by Chemistry, Lesson Guide: Investigation IV Lesson 4 Polar Bears and Penguins 88 Smells UC Regents, LHS Living by Chemistry, 2003. Polar Bears and Penguins Lesson Guide: Investigation IV Lesson 4 Smells UC Regents, LHS Living by Chemistry, Lesson Guide: Investigation IV Lesson 4 Polar Bears and Penguins 90 Smells UC Regents, LHS Living by Chemistry, 2003. Polar Bears and Penguins Lesson Guide: Investigation IV Lesson 4 Smells UC Regents, LHS Living by Chemistry, Lesson Guide: Investigation IV Lesson 4 Polar Bears and Penguins Complete the following for homework: 1. Using polar bears and penguins, create an illustration showing an ammonia molecule, NH 3. (Hint: You may wish to start with a Lewis dot structure.) 92 Smells UC Regents, LHS Living by Chemistry, 2003.
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