Name:
Ionic, Covalent, Diatomic & Polyatomic
Date:
Block:
PART I: Covalent or Ionic?
1)
Summarize the differences between ionic & covalent compounds:
Form between a _____
and a _____
Electrons are
________
(metal/non-metal)
(shared/stolen)
True or False:
Atoms become
ions
The compound is made of
_________
(molecules/crystal lattice)
Ionic
Covalent
2)
Identify whether each is an ionic or a covalent compound.
a. SiF4 ______________________
f. AuBr3 ____________________
b. NaCl _____________________
g. HBr ______________________
c. PbI4 ______________________
h. Br2 _______________________
d. N2S3 _____________________
i. Ca3N2 _____________________
e. NCl5 _____________________
j. HCl ______________________
FUN FACTS: Ionic compounds are hard, covalent compounds are not. Ionic compounds are brittle, covalent compounds are not.
Ionic compounds have a high melting and boiling point, covalent compounds have a low melting and boiling point. Ionic compounds
involve the transfer of electrons, while covalent compounds share electrons. Ionic compounds conduct electricity when dissolved in
water, covalent compounds don’t.
PART II: Diatomic Molecules
1) Definition: A diatomic molecule is a _____________________________________________________
__________________________________________________________________________________.
2) The diatomic elements are:
3) Whenever they are alone (not joined with another element), they are in pairs, so their chemical symbols are:
4) These must be ________________________ but here is a trick:
Part III: Polyatomic Ions
1) Definition: A polyatomic ion is a ___________________________________________________________
______________________________________________________________________________________
2) These do not have to be ______________________ because they are in your ________________________!
3) Polyatomic ions can be positively charged (______________) or negatively charged (_________________).
4) A polyatomic cation acts like a ________________ and a polyatomic anion acts like a ________________.
5) Use your data pages to fill in the chart of polyatomic ions below:
Polyatomic Ion
NAME
hydroxide
Polyatomic Ion
SYMBOL
Polyatomic
Ion CHARGE
Which elements are in this polyatomic ion?
MnO4+1
carbon, nitrogen
sulfite
PO33PO436) Which is the only polyatomic ion in your data pages that is a CATION?
7) Which 4 polyatomic ions in your data pages have 2 different names?
Part IV: Ionic or Covalent?
*A positively charged polyatomic ion acts like a METAL and a negatively charged polyatomic ion acts like a
NON-METAL.
1) B2H6 _________________________
8) NH4Cl ________________________
2) AsBr4 _________________________
9) CBr4 __________________________
3) KF ___________________________
10) (NH4)3PO3 _____________________
4) KNO3 ________________________
11) Na2CO3 _______________________
5) CaSO4 ________________________
12) Fe3(PO4)2 ______________________
6) Ni(OH)2 _______________________
13) CH4 ___________________________
7) CS2 ___________________________
14) (NH4)3N _______________________
15)
How can you tell when a polyatomic ion is part of a compound?