1. Chapter 20 Review

2. What is the charge on a molecule?
0, neutral

3. What is a charged particle called?
ion

4. The oxidation number is equal to the _____ of an ion.
charge

5. What term means “without water”?
anhydrous

6. What is the name of the ion PO43-?
phosphate

7. What is the name of a compound that is covalently bonded?
molecule

8. True or False? The number of each type of atom in a compound is shown as a subscript.

9. A charged group of covalently bonded atoms is called a(n)?
Polyatomic ion

10. The sum of oxidation numbers in a compound is always _____.
zero

11. How many electrons are needed in the outer energy levels of MOST atoms to be stable?8

12. Which element’s atom is an exception to this rule?
Helium

13. What is the name of CaO?
Calcium oxide

14. Superscripts written on atoms represent what?
Charge/ oxidation number

15. What type of bond occurs when atoms share electrons?
covalent

16. Molecules like water that have a slight positive charge on one end and a slight negative charge on the other are called _____.
polar

17. True or False? When atoms form ions they must lose or gain electrons.

18. What would be the charge on an ion that gains 2 electrons?-2

19. This group of elements does not form compounds readily because their outer energy levels are filled.
Noble gases

20. How many lithium atoms are in a compound made from lithium and nitrogen?3

21. What is the name of this compound (Li3N)?

22. What is the charge on an aluminum ion?3+

23. True or False? The charge of carbonate in this formula (K2CO3) is - 1.

24. What is the formula for the ammonium ion?
NH4+

25. True or False? A compound with one atom with a stronger attraction for the electrons will be nonpolar.
false

26. How many atoms are in this compound Ba(NO3)2?9

27. An ionic compound with water attached to it is called a ______.
hydrate

28. True or False? This is the correct way to write the formula for a hydrate. MgCl2 (2H2O)

29. What is the formula for copper (I) flouride?
CuF

30. What is the name of N2F4?
Dinitrogen tetrafluoride

31. What is the formula for zinc sulfide?
ZnS

32. What is the name of FeO?
Iron (II) oxide

33. What is the formula for aluminum bromide?
AlBr3

34. What is the name of HNO3?
Hydrogen nitrate

35. What is the formula for magnesium iodide monohydrate?

36. What is the name of Be3P2 . 6H2O?
Beryllium phosphide hexahydrate

37. Final Jeopardy- Make Your Wagers

38. How many atoms are in this compound?
(NH4)2Se . 3H2O 20