Welcome to Chemistry on this lovely Tuesday morning!
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- Jonas Wright
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1 Welcome to Chemistry on this lovely Tuesday morning! Bell-ringer activity: Please get out your chemistry notebooks and grab a textbook from up front. Begin to read pages on naming molecular (covalent) compounds. Take notes and/or read carefully while we go around to collect and check the homework due for today. HW Due Today: 15 Bullet Notes from the reading in Chapter 8 pgs Agenda for Today: - Bell-ringer reading and collecting/checking homework - Pass back tests, ask questions, sign up for retake - Put Multiple Choice selections into Smart Response - Begin new unit on Covalent Bonding - naming covalent compounds 1
2 What questions from the Mole and Stoichiometry Test do you have? 2
3 Quick Animated video showing Ionic versus Covalent bonding 3
4 Welcome to Chemistry on this lovely Wednesday! -Please get out your chemistry notebooks, periodic table, a writing utensil, and any HW you need to still show us HW Due Today: If you did not complete the 15 Bullet Notes from the reading in Chapter 8 pgs on Friday, please show us today. If you are planning on taking the re-take exam this Friday, January 25th, please turn in your pink sheet. Agenda For Today: - Unit V Objective Sheet - Naming Covalent Compounds (and Reviewing naming of Ionic compounds and Acids) - What is a covalent bond? - Beginning molecular geometries (get handout) 4
5 Co - means to share (like co-workers or co-captains) Covalent means to share the VALENCE electrons There are two ways that elements want to be like the nearest noble gas: 1) Gain or lose electrons to form an ionic compound. 2) Share electrons with other elements to form covalent compounds. For this unit we are going to be looking at how elements share electrons to form covalent compounds. BUT How/why does this happen? Whenever two nonmetals bond to each other, electrons don t get transferred because both elements have similar electronegativities (i.e. they both want to gain electrons to be like the nearest noble gas). - In ionic bonding (as with NaCl, Cl is electronegative and Na isn t, so Na doesn t mind giving electrons to Cl). This way, both fill their octets. - In covalent bonding (as with F 2 ), both elements have similar electronegativities so neither will give electrons to the other. As a result, they re forced to share electrons. 5
6 Let's start with how to name covalent compounds and REVIEW how to name ionic compounds: 6
7 7
8 HW for Thursday (Red) or Friday (Blue): Students are to review how to identify a compound as either Ionic, Covalent, or Acid. Students should also be very comfortable with writing the name or formula when given the formula or name of a compound. To review naming ionic compounds, please complete these problems: pgs , # 11, 13, 17, 18 To review naming covalent compounds, please complete these problems: pg. 270, #22, 23, 24. To review naming acids, please complete these problems: pgs , #29, 32ab, 58 The quiz for naming compounds will be at the beginning of class on Thursday (Red) or Friday (Blue). ***For Red Day students (3rd Block): If you ARE planning on re-taking the Mole and Stoichiometry Test then you need to work and complete the retake worksheet for the beginning of Thursday's class. 8
9 Looking at Simple Covalent Molecules and their shapes Today we got out the molecular building kits and made the following molecules: - H 2 We discovered this has a linear shape - NH 3 We discovered this has a trigonal pyramidal shape - H 2 O We discovered this has a bent shape - CH 4 We discovered this has a tetrahedral shape 9
10 Let's start with how to name covalent compounds and REVIEW how to name ionic compounds: 10
11 11
12 HW for Thursday (Red) or Friday (Blue): Students are to review how to identify a compound as either Ionic, Covalent, or Acid. Students should also be very comfortable with writing the name or formula when given the formula or name of a compound. To review naming ionic compounds, please complete these problems: pgs , #11, 13, 17, 18 To review naming covalent compounds, please complete these problems: pg. 270, #22, 23, 24. To review naming acids, please complete these problems: pgs , #29, 32ab, 58 The quiz for naming compounds will be at the beginning of class on Thursday (Red) or Friday (Blue). ***For Red Day students (3rd Block): If you ARE planning on re-taking the Mole and Stoichiometry Test then you need to work and complete the retake worksheet for the beginning of Thursday's class. 12
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