Chemistry POGIL Activity «Activity_»



HS Chemistry POGIL Activity Topic: Naming & Formula Writing 2 (BW)

True identity – What’s the charge?

Why? In this activity we will address the question: How can we tell what charge a metal atom will have when the metal element is part of a compound with a non-metal?

Common Charges of Elements in

Compounds with one metal element and one non-metal element

| |Group |

|Period |1 |2 |3 |

|Particle |[pic] |[pic] |[pic] |[pic] |

|model | | | | |

|Formula |KI |CuCl |CuCl2 |MgO |

|Name |potassium iodide |copper (I) chloride |copper (II) chloride |magnesium oxide |

| | | | | |

|Elements |iron with oxygen |lithium with sulfur |tin with oxygen |

|Particle |[pic] |[pic] |[pic] |[pic] |

|model | | | | |

|Formula |FeO |Fe2O3 |Li2S |SnO2 |

|Name |iron (II) oxide |iron (III) oxide |lithium sulfide |? |

1. Look on the table of charges of elements in compounds with one metal element and one non-metal element. What elements have a positive charge in the compound? Which ones have a negative charge in a compound?

2. Which naturally occurring (elements up to period 7 group 3) don’t form compounds with charges? What evidence did you use from the table of charges to support your answer?

3. Which elements have only ONE possible charge when making compounds of metals and non-metals?

a. Name 4 and give their charges from the left side of the periodic table:

b. Name 4 and give their charges from the right side of the periodic table:

4. Of the elements which have only ONE possible charge, do you notice any patterns of which elements have -1, -2, or -3 charges? If so, explain the pattern you see.

5. Of the elements which have only ONE possible charge, do you notice any patterns of which elements have a +1, +2, or +3 charges? If so, explain the pattern you see.

6. Give 6 examples of elements that can have MORE THAN ONE possible charge when making compounds? Where are most of these elements found on the periodic table?

7. What are the possible charges for copper when it forms a compound with a non-metal?

Possible charges for iron?

Possible charges for lead?

Possible charges for manganese?

8. Look at the particle models for the example compounds (bottom of the first page). What do the circles represent?

Why are the compounds shown in a lattice structure and not as molecules?

9. Why aren’t there any charges shown in the formulas of the compounds?

10. Which element comes first when writing the chemical formula?

11. Why are there two different arrangements of atoms when copper makes a compound with chlorine? How are the two arrangements different in terms of how many atoms of each element are present in the lattice?

How are the formulas different?

12. How many different ways can rubidium form a compound with bromine?

What would the particle model for that/those compound(s) look like? (draw a simple sketch of a sample of the lattice) What would the formula(s) be?

13. How many different ways can copper form a compound with bromine?

What would the particle model for that/those compound(s) look like? (draw a simple sketch of a sample of the lattice) What would the formula(s) be?

14. If someone told you that zinc formed a compound with sulfur, would you be able to write down the formula for that compound? Explain why or why not? If so, what would the formula be?

15. If someone told you that lead formed a compound with sulfur, would you be able to write the formula down? Explain why or why not? If so, what would the formula be?

16. If you couldn’t write down the formula for the previous question, what information would you need in order to know what the formula must be?

17. What does the Roman numerals in “ copper (I) chloride and copper (II) chloride mean? Explain how you got your answer.

18. Specify which of the following compounds would need to have a Roman numeral in the name

|elements |Need a Roman numeral? |elements |Need a Roman numeral? |

| |Yes or No | |Yes or No |

|potassium with fluorine | |gold with fluorine | |

|copper with oxygen | |aluminum with phosphorus | |

|cobalt with nitrogen | |strontium with selenium | |

|silver with bromine | |lead with oxygen | |

|titanium with oxygen | |nickel with chlorine | |

Flow chart for deciding how to name Compounds made of two different elements

[pic]

Examples: CaO was named calcium oxide because there is only one way calcium can combine with oxygen.

CuCl was named copper (I) chloride because copper can have two possible charges (a +1 or a +2) so you need to use the Roman numeral (I) to show that this compound was made with copper with a +1 charge

Name the following compounds

16. ZnCl2 _____________

17. CoN _____________

18. PbS2 _____________

19. Al2O3 _____________

Write formulas for the following compounds.

20. silver iodide

21. potassium oxide

22. nickel (II) sulfide

23. iron (III) oxide

On your own

Write the formulas and names of the ionic compounds formed from the ions listed below.

| |F |O |S |Br |N |

| |BaF2 | | | | |

|Ba |barium fluoride | | | | |

| | | | | | |

| | | |MgS | | |

| | | |magnesium sulfide | | |

|Mg | | | | | |

| | | | | | |

| | | | | | |

|Li | | | | | |

| | | | | | |

| | | | | | |

| | |Cu2O | | | |

|Cu | |Copper (I) oxide | | | |

| | |or | | | |

| | |CuO | | | |

| | |copper (II) oxide | | | |

| | | | | | |

| | | | | | |

|Al | | | | | |

| | | | | | |

| | | | | | |

| | | | | | |

|Ag | | | | | |

| | | | | | |

| | | | | | |

| | | | | | |

|Fe | | | | | |

| | | | | | |

| | | | | | |

| | | | | | |

|Sn | | | | | |

| | | | | | |

| | | | | | |

| | | | | | |

|Zn | | | | | |

| | | | | | |

Teacher Resources

Prior knowledge needed for this activity:

• This activity assumes that:

Student have completed “Particle connections – What’s in a name?”

Thoughts on presentation of the activity:

• Make sure students have an individual copy of the periodic table at the start of the activity

• I have included some suggested points which seem to be important for verifying understanding before allowing groups to move forward. These spots are marked with a:

Target Responses for the tasks:

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