Science 10 Assignment U1L5 (20 marks)
1. Explain how to recognize an ionic compound from its chemical formula. (1
mark)
2. Describe four properties of an ionic compound. (4 marks)
3. Explain how to recognize a molecular compound by its chemical formula. (1
mark)
4. Describe four properties of molecular compounds (4 marks)
5. Water is a polar molecule. What does that mean ? (1 mark)
6. Indicate whether each of the following compounds is slightly soluble (s) or
very soluble (aq). Refer to the solubility table at the bottom of the document.
(7 marks)
a) NaCl
b) PbCl2
c) PbCl4
d) BaSO4
e) Cr2S3
f) CsCH3COO
g) K2CO3
7. Explain how a large body of water can moderate the temperature of the land
around it in both winter and summer. (2 marks)
Solubility Table
Solubility of Some Common Ionic Compounds in Water
Note: Group 1 = Li+, Na+, K+, Rb+, Cs+, Fr+
Group 2 = Be2+, Mg2+, Ca2+, Sr2+ Ba2+, Ra2+
“all” means “all compounds containing these ions”
“most” means “most compounds containing these ions”
“only with” means “only compounds containing” the ion or ions listed
Ion
Group
1
NH4+
H3 O+
(H+)
ClO3−
NO3−
ClO4−
CH3COO−
Cl−
Br−
I−
SO42−
S2−
OH−
PO43−
SO32−
CO32−
Very
Soluble
all
all
most
most
most
only
with:
Group 1
Group 2
NH4+
only
with:
Group 1
NH4+
Sr2+
Ba2+
Tl+
only
with:
Group 1
NH4+
Slightly
Soluble
none
none
only
with:
Ag+
Hg+
only
with:
Ag+
Pb2+
Hg+
Cu+
Tl+
only
with:
Ca2+
Sr2+
Ba2+
Ra2+
Pb2+
Ag+
most
most
most