Page 19 - Big Ideas Year 10 sciPAD 2025

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SCIPAD - BIG IDEAS - BOOK 2
NATURE OF THE ATOM
4. Complete the cartoon below.
I know an element is a substance that
is only made of one type of atom, but
how's that different from a compound?
Sweet. That makes it clearer. Just one
more thing. . . is water an element or a
compound?
Well, a compound is
For example
is a compound.
Water is a
because it is made from
and atoms chemically
bonded together.
Awesome mate!
5. Decide if the following chemical formulae represent elements or compounds.
6. Calculate the number of atoms in the following compounds. The first one has been done
for you.
(a) NaCl 
(b) H2 
(c) H2O 
(d) S8 
(e) Li2O 
(f) Cl2 
(g) CO2 
(h) Al2O3 
(i) Ag 
(j) KF 
(a) NaCl 2 atoms
(b) SO2 
(c) H2O 
(d) Li2O 
(e) CO2 
(f) Al2O3 
(g) HNO3 
(h) HCl 
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