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Daily Science pg. 56

Daily Science pg. 56. Write the formulas for the following ionic compounds, name them, and draw the Lewis dot diagram: Magnesium and Iodine Boron and Sulfur Lithium and phosphorus Tin and Bromine Potassium and SULFATE Barium and HYDROXIDE

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Daily Science pg. 56

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  1. Daily Sciencepg. 56 • Write the formulas for the following ionic compounds, name them, and draw the Lewis dot diagram: • Magnesium and Iodine • Boron and Sulfur • Lithium and phosphorus • Tin and Bromine • Potassium and SULFATE • Barium and HYDROXIDE • Name the following compounds that contain a TRANSITION METAL: • Zn2O3 • ZrF2 • CuN

  2. Metallic and Covalent Bonds Pg. 55

  3. Metallic Bonds Between a metal and a metal Outer energy levels form a ‘sea of electrons’ High melting and boiling points Good conductors Can make alloys (mixture of elements that have metallic properties) Ex. Brass and bronze

  4. Covalent Bonds Non-metal and non-metal Valence electrons are shared Form molecules (2 or more atoms covalently bonded) Use Lewis Structures to show covalent bonds

  5. Lewis Structures and Covalent Bonding • The shared electrons are called bonding pairs • Unshared electrons are called lone pairs • Single bonds in a Lewis structure are called sigma bonds (σ) • Double and triple bonds are called pi bonds (π) • When bonds are broken they either release energy or take in energy • Exothermic- energy is released (feel heat) • Endothermic- Energy is absorbed ( feels cold)

  6. Naming Covalent Bonds • Name the first element first using the whole name • If there is only one of the element name is regularly • If there is more than one of the element use a prefix • The second element ALWAYS gets a prefix and the ending drops and you add –ide • Neither one is capitalized

  7. Examples CCl4 As2O3 CO SO2 NF3

  8. Naming Acids • Always has a Hydrogen attached to it and is always dissolved in water • Naming binary acids: • Only 2 elements • Has a hydrogen atom • Hydro- element or polyatomic ion-ic acid • Naming oxyacids: • A polyatomic ion that contains an oxygen • If the ion ends in –ate change it to –ic • If the ion ends in –ite change it to –ous

  9. Examples HBr HCN HNO3 HNO2

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