3 – Understanding chemical formulae
1
Complete the table below, giving the number, type and total number of atoms for each substance.
Substance
Number and type of atoms
a
Mg(OH)2
d
2 NaOH
e
Al2(SO4)3
f
Mn3(PO4)2
g
5 Pb(OH)2
h
KMnO4
i
NH4NO3
j
NaClO3
k
Zn(C2H3O2)2
l
Total atoms
Na2SO4
c
/ 24
H2O
b
2 marks for each correct row
6 C6H12O6
2 Describe what the following chemical symbols and formulae represent.
Symbol or formulae a
OH1-
b
Polyatomic ion (hydroxide). One atom of oxygen bonded to one atom of hydrogen, with an overall charge of –1.
2 marks for each correct answer 3 CaCl2
d
/ 6
CO2
c
Description
Al(NO3)3
TOTAL
/ 30
16
Quick Science Tests – Chemistry 2
© Michael Profitt and Blake Education 2010
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