Start a fire with
water |
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Take care and
read the safety instructions at the bottom of the page. Weigh them separately as shown
on the right. Use dry beakers. Only mix them when you are ready to demonstrate
the reaction. |
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Place the mixture in a crucible and place a drop of water on the mixture. Quickly stand well back. The reaction will cause a great deal of heat and powder (zinc oxide) to form.
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View the video on the right. |
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Safety notes This reaction is highly exothermic (gives off heat). It ignites spontaneously at the slightest contact with water. Once mixed, this powder should be used immediately and never stored under any conditions as water vapour in the air will cause spontaneous combustion. |
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The chemistry behind this reaction is given below. 1) After the reaction can you
smell chlorine? Where do you think this chlorine gas comes from? |
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Senior chemistry NH4NO3(s)
=> N2O(g) + 2H2O(l) This reaction
is exothermic and the heat given off melts the NH4NO3
and allows the oxidation of zinc. The overall reaction is summarised
below. |
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What is the change in oxidation state of Zn? What is the oxidation state of N in NH4NO3? Identify the reductant? Identify the oxidant? |
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Continue
with guncotton |