Test: Electrons in Atoms

Name: ______Date ______Period: 1 2 3 4 5 6 7 CH 9 Test Review: Covalent Compounds and Naming

1. A. What does the prefix given mean? Tetra- ______atoms present Hexa- ______atoms present Mono- _____ atoms present B. Give the prefix that corresponds to the number shown: Three ______Five ______Seven ______Two ______

2. What is the correct formula for: A. strontium carbonite B. Gold (I) Phosphate C. Nickel (II) Chromate What is the correct name for:

A. FeS B. Pb(OH)4 C. CuBr2 3. Give the number of bonds and lone pairs around a central atom the is: Bond Pair Regions Lone Pairs trigonal planar ______bent ______tetrahedral ______4. In a metallic bond metal cations are held together by delocalized ______. 5. In a polar bond, what condition is present?

6. In the compound CHF3, how many atoms are bonded to the central atom? 7. What is the correct name for:

A. C2H6 B. C4H8 C. N2O4 8. What is the correct formula for: A. tricarbon octafluoride B. Silicon tetrahydride 9. What is the bond angle in a: A. tetrahedral molecule ______B. trigonal planar molecule ______C. linear molecule ______10. How many π bonds are there in a: A. single bond ______B. triple bond ______C. double bond ______11. How many sigma bonds are there in: A. carbon tetrahydride ______B. dicarbon tetrahydride ______12. How many pi bonds are there in: A. dicarbon tetrahydride ______B. dicarbon dihydride ______

13. Most atoms want _____ valence electrons – but, hydrogen only wants ___ valence electrons.

14. A particular pure element is dull, not malleable, does not conduct electricity, is difficult to dissolve in water, and when dissolved does not conduct electricity. What is the most likely bond between the atoms of this element? Ionic Metallic Covalent

15. How many hydrogens are there in: A. Hydrobromic Acid ______B. Bromic Acid ______C. Phosphoric Acid ______

16. When you compare the bond angles of a bent molecule to those of a tetrahedral molecule, one is smaller. Why is this so?

17. What is the shape (based on the central atom) of the following compounds:

A. OCl2 B. PH3 C. SiCl4

28. What is the correct Lewis Structure for: A. SF2? B. SiF4?

29. What is the correct formula for: A. carbonic acid

B. carbonous acid 30. In the formation of a covalent bond, electrons are ______. In forming an ionic bond electrons are ______or ______. 31. How many elements are in a binary acid? Give two examples of binary acids.

32. What is the meaning of the term electronegativity?

33. Which element has the highest electronegativity- Hydrogen, oxygen, carbon or fluorine?

34. Which element has the lowest electronegativity- Hydrogen, oxygen, carbon or fluorine?

35. In hydrogen chloride the bond holding the atoms together is ______. (Ionic, metallic polar covalent, or covalent?)

36. In brass the bond holding the atoms together is ______. (Ionic, metallic polar covalent, or covalent?)

37. In nitrogen gas the bond holding the atoms together is ______. (Ionic, polar covalent, or covalent?)

Which type of bonding is present when a substance: 38. Conducts electricity when dissolved in water covalent ionic metallic 39. Does not conduct electricity covalent ionic metallic 40. Is a waxy solid or gas covalent ionic metallic 41. Is found to be malleable covalent ionic metallic

Draw the Lewis Dot Structure and give the shape for each of the following:

42. carbon tetrafluoride.

43. PF3.

44. carbon disulfide

45. CH2FI