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solution8_pdf - goins(jmg3964 Post-lab 2 Lyon(51215 This...

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goins (jmg3964) – Post-lab 2 – Lyon – (51215) 1 This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points What is the simplest formula for chromium(III) and sulfide? 1. Cr 2 Se 2 2. CrSe 2 3. Cr 2 Se 3 correct 4. CrSe 3 5. Cr 3 Se 3 6. CrSe 7. Cr 3 Se 8. Cr 3 Se 4 9. Cr 2 Se 10. Cr 3 Se 2 Explanation: Cr 2 Se 3 is the simplest formula using chromium(III) and sulfide. 002 10.0 points Name the compound Mg(ClO) 2 . 1. magnesium chlorate 2. magnesium perchlorite 3. magnesium hypochlorite correct 4. magnesium perchlorate 5. magnesium dichlorite 6. magnesium chlorite Explanation: 003 10.0 points What is the formula for iron(III) oxide? 1. Fe 2 O 3 correct 2. FeO 3. Fe 2 O 4. FeO 3 Explanation: The iron(III) ion is Fe 3+ ; the oxide ion is O 2 - . Three O 2 - are needed to balance the charge of every two Fe 3+ . (This gives a total anion charge of - 6 and a total cation charge of +6.) The formula is Fe 2 O 3 . 004 10.0 points The correct name for the compound K 2 Cr 2 O 7 is 1. potassium dichromate. correct 2. potassium chromium oxide. 3. potassium chromate. 4. dipotassium dichromium heptaoxide. 5. dipotassium dichromate. Explanation: Cr 2 O - 2 7 is the dichromate ion. K 2 Cr 2 O 7 is an ionic compound and does not require the use of prefixes to indicate the number of each type of ion (as in the incorrect name dipotassium dichromate). 005 10.0 points Name the compound Ca 3 N 2 . 1. calcium nitride correct 2. dicalcium trinitride 3. dicarbon trinitride 4. carbon nitride
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goins (jmg3964) – Post-lab 2 – Lyon – (51215) 2 5. tricarbon dinitride 6. tricalcium dinitride Explanation: Prefixes such as “di-”, “tri-”, etc. are used when more than one compound can be made from the elements involved. This commonly happens when two or more nonmetals come together to form a compound. When met- als bond with nonmetals, typically only one compound can be made between them so pre- fixes are not needed. This is the case with the compound Ca 3 N 2 , which is properly named as calcium ( not carbon) nitride. 006 10.0 points Cobalt(III) oxide would be the label for 1. Co 2 O 3 . correct 2. Co 3 O 2 . 3. CoO. 4. CoO 3 . 5. Co 3 O. Explanation: The cobalt(III) ion is Co 3+ ; the oxide ion is O 2 - . Three O 2 - are needed to balance the charge of every two Co 3+ . (This gives a total cation charge of +6 and a total anion charge of - 6.) The formula is Co 2 O 3 . 007 10.0 points Which compound has the wrong chemical for- mula? 1. Ba 3 (PO 4 ) 2 2. CaOH correct 3. Mg(OH) 2 4. (NH 4 ) 2 SO 4 Explanation: The calcium ion is Ca 2+ ; the hydroxide ion is OH - . Two OH - are needed to balance the charge of each Ca 2+ , so the formula is Ca(OH) 2 . The magnesium ion is Mg 2+ ; the hydroxide ion is OH - . Two OH - are needed to balance the charge of each Mg 2+ , so the formula is Mg(OH) 2 . The barium ion is Ba 2+ ; the phosphate ion is PO 3 - 4 . Two PO 3 - 4 are needed to balance the charge of every three Ba 2+ . (This gives a total anion charge of - 6 and a total cation charge of +6.) The formula is Ba 3 (PO 4 ) 2 .
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