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homework3

# homework3 - sy3475 Homework 3 Sutcliffe(53980 This...

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sy3475 – Homework 3 – Sutcliffe – (53980) 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Write the total ionic equation for this reac- tion occuring in water: Ammonium fluoride and magnesium chloride are mixed to form magnesium fluoride and ammonium chloride. 1. 2 F - + MgCl 2 MgF 2 + 2 Cl - 2. 2 NH + 4 + 2 F - + Mg 2+ + 2 Cl - Mg 2+ + 2 F - + 2 NH + 4 + 2 Cl - 3. 2 NH + 3 + 2 F - + Mg 2+ + 2 Cl - MgF 2 + 2 NH + 3 + 2 Cl - 4. 2 NH + 4 + 2 F - + MgCl 2 MgF 2 + 2 NH + 4 + 2 Cl - 5. 2 NH 4 F + Mg 2+ + 2 Cl - Mg 2+ + 2 F - + 2 NH 4 Cl 6. 2 NH + 4 + 2 F - + Mg 2+ + 2 Cl - MgF 2 + 2 NH + 4 + 2 Cl - correct 7. 2 F - + Mg 2+ MgF 2 Explanation: 002 10.0 points When 0 . 0876 mol of iron(III) chloride are dis- solved in enough water to make 410 milliliters of solution, what is the molar concentration of chloride ions? 1. 0 . 192 mol / L 2. 0 . 609 mol / L 3. 0 . 427 mol / L 4. 0 . 748 mol / L 5. 0 . 0427 mol / L 6. 0 . 214 mol / L 7. 0 . 107 mol / L 8. 0 . 855 mol / L 9. 0 . 641 mol / L correct 10. 0 . 961 mol / L Explanation: 003 10.0 points Pick the name and formula that do NOT match. 1. HF : fluoric acid correct 2. H 2 SO 3 : sulfurous acid 3. H 3 PO 4 : phosphoric acid 4. HC 2 H 3 O 2 : acetic acid Explanation: HF is hydrogen fluoride. In aqueous solu- tion, HF is known as hydro fluor ic acod. C 2 H 3 O - 2 is the acet ate ion so HC 2 H 3 O 2 is acetic acid.

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