Testing Gases! The hydrogen “pop” test
Please answer the questions below regarding the experiment that we completed
Discussion:
1. Is step 3 a precipitation, neutralisation, decomposition or combustion
reaction?
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2. Is this a chemical reaction? What evidence do you have of this – explain your
answer.
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3. How did you know that hydrogen gas was being produced?
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4. What was the appearance of this gas?
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5. When testing for hydrogen, why does the match need to be placed in the
mouth of the test tube as soon as the rubber stopper is removed?
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6. Besides the hydrogen gas, another compound was produced in this reaction.
Name the two elements that you think would make up this compound and try
writing the name of this compound.
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7. Write a word equation and chemical equation for the reaction taking place
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8. Did you hear a ‘pop’ in step 3 of the experiment both times? If no sound was
produced, suggest an explanation for this.
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