Chemistry

Summary In this activity, students construct physical models of molecular shapes. However, students are not told what the preferred arrangements of electron pair domains are. Instead, they derive the arrangements. Students are given the opportunity to conceptualize what is happening when one electron pair domain acts upon another, and to understand how those interactions result in the molecular geometries predicted by VSEPR theory. Grade Level High School Objectives By the end of this activity, students should be able to Conceptualize the impact of one electron pair domain acting upon another, and understand how those interactions result in the molecular geometries predicted by VSEPR theory. Describe the implications of electron pair repulsions on molecular shape.

Metals & Alloys KEY 1. Electrons are stationary in a metallic compound. True or False? 2. Copper is often used to make wires. This is because.... (you may select more than one response) it is ductile it has a high electronegativity it is conductive it is malleable 3. Most metals are _____________at room temperature. gas liquid molten solid 4. Sterling silver is composed of silver & copper. What type of alloy is this? interstitial alloy substitutional alloy substitutional?institial alloy it's not an alloy, its an ionic compound 5. An alloy is formed using a transition metal and carbon. It retains the crystalline structure of the transition metal. What type of alloy is created? A Hetergeneous B Homogeneous substitional C Homogenous interstitial D Intermetallic

Name ______________________________ In this activity we will learn how to draw Lewis structures, calculate formal charge and examine resonance. We will also observe the Octet rule and exceptions to this rule. AP Chem. Lewis Dot Structure Worksheet Write Lewis Dot Structures and calculate the formal charges for the following compounds: 1. SO2 18. H2O2 CO3-2 19. C2H6 NH3 20. CH3OH CH4 21. C2H4 H2 22. C4H10 HF 23. C2H5OH H2O 24. ClO- N2 25. H2S2 HCl 26. HNO3 H2S 27. H2SO4 PF3 28. CH3NO2 CH3COOH 29. C2H2 NH4+ 30. ClO2- NO2- 31. PO4-3 SO4-2 32. CO NO2+ 33. CO2 OH- Formal Charge

Lewis Structures, Shapes, and Polarity W 319 Draw Lewis structures and indicate polar or non-polar for ONE of the bonds (point to the bond you are naming): CH4 NCl3 CCl2F2 CF2H2 CH2O CHN PI3 N2O SO2 CS2 CO H2O COF2 N2 O2 H2 Cl2 HF O3 NI3 Everett Community College Student Support Services Program Lewis Structures, Shapes, and Polarity W 319 :(b) (c) : : : :H Cl (d) : :H H C H H : Cl N : :: Cl : Cl : : :: F C :: F : Cl : : :: F C H :: F : (e) (f) H C N (g) (h) : : : : : : :O C H H : l P l : : : :: l : : : :(i) (j) S C S : : : : : :S (k) C S (l) (m) C : : : :: F F (n)