Identify the chemical changes in
For each one identify the
reactants and products. Write a chemical equation.
What is inside the bubbles
produced when the hydrochloric acid is added to the zinc?
Why were the flasks full of water
while the hydrogen gas was generated and bubbled into them?
Why did Mr. Keller keep the flask
full of hydrogen upside-down?
The first flask produced a loud
sound and flames inside the flask. Why did this happen?
Why did the candle go out when it
was inside the flammable hydrogen gas?
How was he able to re-light the
candle when he pulled it out of the flask?
Why didn’t the hydrogen in
the flask burn up quickly? What did it do instead and why?
Liquid water is constantly evaporating at room temperature. Given that the hydrogen gas was collected by displacing water from a flask, what other gas shared space with it?
Zn + 2HCl --> ZnCl2 + H2
2H2 + O2 --> 2H2O
Demonstration 6.6 pg 128 of Book 2 of Chemical Demonstrations by Bassam Z.
I made of video of this demonstration: https://youtu.be/W1qSpndGSSY
Last updated: Aug 27, 2019
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