[PDF] [PDF] ChemQuest 21 Information: Charges of Some Transition Elements

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[PDF] ChemQuest 21 Information: Charges of Some Transition Elements

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ChemQuest 21

Name: ____________________________

Date: _______________

Hour: _____

Information: Charges of Some Transition Elements

So far you have learned that you can predict the charge that an ion will have based on its location on

the periodic table. However, the transition elements are not easy to predict. A few common transition elements are listed below. You should memorize their charges.

Silver: Ag

+Zinc: Zn2+Cadmium: Cd2+

Critical Thinking Questions

1. Write the formulas for the following compounds:

a) silver nitrate b) zinc phosphate c) cadmium chloride

AgNO3Zn3(PO4)2CdCl2

Information: More Than One Possible Charge

Many transition elements can have more than one charge when they become an ion. Copper ions, for example, can be Cu + or Cu2+. As another example, iron ions are sometimes Fe2+ and sometimes Fe3+.

Critical Thinking Questions

2. Copper and iron are in the "d block" and so you need to calculate their charge by comparing

what bonds to them. Find the charge on copper and iron in each of the following compounds. a) CuCl

2b) CuCl c) FeSO4d) Fe2(SO4)3

+2 +1 +2 +3 (This is similar to what you did in question 10 for ChemQuest 16)

3. Give your best attempt at naming the compounds from question 2. (They are rewritten

below.) a) CuCl

2b) CuCl c) FeSO4d) Fe2(SO4)3

copper chloride copper chloride iron sulfate iron sulfate 64

Information: Formulas Containing Roman Numerals

You probably put the same name for the compounds in question 3a and 3b. You may also have put the same name for the compounds in 3c and 3d. BUT these are not the same compound! You cannot have the same name for two different compounds. Here are the correct names for the compounds in questions 2 and 3: a) CuCl

2b) CuCl c) FeSO4d) Fe2(SO4)3

copper(II) chloride copper(I) chloride iron(II) sulfate iron(III) sulfate

Critical Thinking Questions

4. Compare your answers for questions 2 & 3 with the names of the compounds given in the

information section. What do the Roman numerals stand for? The Roman numerals stand for the charge on the transition metal ion.

5. Why is MnO2 called manganese(IV) oxide?

Manganese has a charge of +4 indicated by the Roman numeral IV.

6. Name the following compounds. Note: assume that anytime you have a transition element (d

block element) you must use a Roman numeral unless the element is silver, zinc, or cadmium. (The first one is done for you.) a) NiNO

3b) Cr2(CO3)3c) FeNO3d) CoCl2

nickel(I) nitrate chromium(III) carbonate iron(I) nitrate cobalt(II) chloride e) Cu3(PO4)2f) MnS g) ZnCl2h) AgNO3 copper(II) phosphate manganese(II) sulfide zinc chloride silver nitrate (No Roman numerals are needed for zinc or silver, but if you included them it is OK.)

7. Write the formulas for the following compounds. (The first one is done for you.)

a) mercury(II) acetate b) chromium(III) sulfate c) iron(I) carbonate

Hg(C2H3O2)2Cr2(SO4)3Fe2CO3

d) potassium carbonate e) strontium nitride f) manganese(IV) chlorate

K2CO3Sr3N2Mn(ClO3)4

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