Name
Date
Pd
Chemistry – Unit 6 – Describing Compounds Review
Part 1 – Unit 6 Concepts
1.
Recall your representation of the atoms in the Sticky Tape activity. Below is a pair of tapes before they have been
pulled apart. Explain why they would not exert a force (either attractive or repulsive) on one another.
2.
Below are groups of the inner cores of the atoms of the tapes after they have been pulled apart. Sketch in the
mobile negative charges to show how the top tape becomes (+) and the bottom tape becomes (-).
3.
Below is a group of the inner cores of a piece of metal foil. Sketch in where you would expect to find the mobile
negative charges if a top (+) tape were brought to the left of the foil. Explain your diagram
4.
Describe Thomson’s model of the atom and draw a labeled picture of the model.
5.
How many ions are formed when solid Na2SO4 dissolves? ____________
In what ways are the positive (+) and negative (-) ions different structurally?
Chemistry
1
U6 Review 2013
6.
Below is a two-dimensional array that represents a three-dimensional ionic lattice and a two-dimensional array that
represents a three-dimensional molecular solid. Correctly identify each:
a) type of compound:
b) type of compound:
basic structural unit ___________________
basic structural unit ____________________
Now answer the following related to these compounds:
c) In what ways are they similar?
d) In what ways are they different?
e) Will either of these compounds conduct electricity as a solid?
f) Which one will conduct electricity as an aqueous solution?
Explain why and draw a particle diagram to support your explanation.
7.
Positive ions are called ___________________ and negative ions are called __________________.
8.
Why do ionic solids have higher melting and boiling points than do most molecular solids?
Chemistry
2
U6 Review 2013
9.
Phosphorus forms many different ionic and molecular compounds. Two of these are phosphorus trichloride and
potassium phosphide.
a) Write the chemical formula for each and identify the compound as molecular or ionic.
PHOSPHORUS TRICHLORIDE
POTASSIUM PHOSPHIDE
b) Draw a particle level representation of a
molecule of the molecular compound.
c)
Draw a representation of a formula unit
(empirical formula) of the ionic compound.
Part 2 – Formulas to Names - Correctly name the following compounds (they may be molecular or ionic, including
polyatomic ions and transition metals!)
1. (NH4)2CrO4
8. CS2
2. CuClO2
9. Na2SO4
3. Fe(NO3)2
10. SO3
4. Li2O
11. K2C2O4
5. Ni(NO2)2
12. NBr3
6. SiF2
13. P2O3
7. CaCr2O7
14. Mn(SO3)2
Chemistry
3
U6 Review 2013
Part 3 – Names to Formulas - Identify the following compounds as ionic or molecular. Then give the correct
chemical formula.
M I 15. magnesium hydroxide
M I 22. manganese(II) phosphate
M I 16. diarsenic pentoxide
M I 23. chromium(III) oxide
M I 17. potassium bicarbonate
M I 24. ammonium nitrite
M I 18. tin(IV) hypochlorite
M I 25. lead(II) iodide
M I 19. carbon tetrachloride
M I 26. zinc bromate
M I 20. sulfur hexafluoride
M I 27. silicon dioxide
M I 21. vanadium(II) thiocyanate
M I 28. selenium trioxide
Chemistry
4
U6 Review 2013