49
Use the Periodic Table to answer question 52.
The reaction shown above is used by the
Merlin team to produce hydrogen.
What kind of chemical reaction is this?
combustion
decomposition
neutralisation
precipitation
52 Which model represents an atom of
hydrogen?
50 The chemical reaction to make hydrogen
from sodium borohydride is given as:
NaBH4 → Na + B + 2H2
The chemical equation shows that in a
chemical reaction atoms
are lost
are destroyed
are rearranged
turn into new atoms
51 Complete the word equation for the
combustion of hydrogen.
Choose from a plus sign, an arrow, water
and oxygen to write in each of the boxes.
hydrogen
© 2015 NSW Department of Education
VALID Science 10 - 2015
page 20
53
Sodium Borohydride is given by the
formula NaBH4.
From its position in the Periodic Table,
which element has properties most
similar to Boron (B)?
Aluminium (Al)
Magnesium (Mg)
Mercury (Hg)
Neon (Ne)
54 Choose yes or no for each answer to the
following question.
Which predictions does the Periodic
Table allow us to make?
Yes
No
structure of atoms
colour and location of atoms
chemical reactivity of
elements
physical properties of
elements
© 2015 NSW Department of Education
VALID Science 10 - 2015
page 21