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Name ____________________________________________________ Hour _______ 1. If an element has an oxidation number of +2, it means this element will combine with another element by giving ______________ or taking ______________ electrons. 2. List all of the polyatomic ion (in symbols): 3. A ________________ bond is a transfer of electrons. 4. A ________________ bond is a sharing of electrons. 5. A chemical formula is a shorthand method for representing a ________________________. 6. Define a polyatomic ion: ____________________________________________ _____________________________________________________________________ 7. Look at the following formula: Ag2O3 The numbers 2 and 3 are called _____________. What do they tell us? ___________________________________________________________. 8. Summarize the steps in writing chemical formulas. 9. Summarize the steps in naming chemical compounds. 10. List the 2 elements that have variable oxidation numbers. 11. What is the difference between Nitrogen and Nitrate? ++++ PRACTICE THE FOLLOWING WRITING AND NAMING COMPOUNDS++++ Write the formulas for the following: 1. potassium bromide ___________________________________ 2. barium sulfide ___________________________________ 3. silver sulfide ___________________________________ 4. copper (I) phosphide ___________________________________ 5. ammonium sulfate ___________________________________ Name the following compounds: 1. CrI3 ___________________________________ 2. Ca(OH)2 ___________________________________ 3. (NH4)2(CO3) ___________________________________ 4. Cu2O ___________________________________ 5. Fe2(SO4)3 ___________________________________