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Terms to Know En dothermic -- Takes in heat energy, absorbs heat

Terms to Know En dothermic -- Takes in heat energy, absorbs heat Ex othermic-- Exits heat, releases heat, heat goes out Electrolyte– An ionic compound that conducts electricity. ENDO thermic. Reactants → Products

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Terms to Know En dothermic -- Takes in heat energy, absorbs heat

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  1. Terms to KnowEndothermic -- Takes in heat energy, absorbs heat Exothermic-- Exits heat, releases heat, heat goes out Electrolyte– An ionic compound that conducts electricity

  2. ENDOthermic • Reactants → Products In an ENDOthermic reaction the heat energy is on the left side of the arrow, the reactant side of the equation. Ex: Cl2 (g) + Energy → Cl(g) + Cl(g) Is a bond formed or broken? Is heat energy absorbed or released?

  3. EXOthermic • Reactants → Products In an EXOthermicreaction, the heat energy is on the right side of the arrow, the product side. EX: Cl(g) + Cl(g) → Cl2(g) + Energy Is a bond formed or broken? Is heat energy absorbed or released?

  4. How do molecular formulas differ from ionic (formula unit)? • Write the formulas for the following: calcium phosphate aluminum sulfate calcium hydroxide

  5. What is Electronegativity? • Electronegativity measures the atom’s ability to: • Attract electrons • Repel electrons • Attract protons • Repel protons

  6. As the difference in electronegativity between two atoms decreases, • The tendency for the formation of covalent bonds: • Decreases • Increases • Remains the same

  7. When metals combine with nonmetals, the metallic atoms tend to • Lose electrons and become positive ions • Gain electrons and become positive ions • Lose electrons and become negative ions • Gain electrons and become negative ions

  8. Which Bond has the least ionic character? • KBr • BrCl • HF • MgO

  9. Which bond has the greatest degree of ionic character? • NaF • MgF2 • AlF3 • SiF4

  10. Which element has atoms that can form single, double, and triple covalent bonds with other atoms of the same element?

  11. What happens to the electrons when metals combine with nonmetals? • List the properties of ionic compounds. • List the properties of covalent compounds.

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