1. Electrolysis of Water

2. Purpose: The purpose of the experiment is to identify the elements that make up water and the proportion of each in a water molecule. Hypothesis: The elements that make up water are ____________ and __________ and will be in a ____:____ ratio. Provide a justification for the hypothesis here. Materials List: Diagram: (given) Procedure: (given)

3. Observations: Volume in “ + ” Test Tube (mL) Volume in “ - ” 1.0 2.0
3.0
4.0
5.0
Lit splint test on “ - ” test tube
Glowing splint test on “ + ” test tube

4. Analysis:
The sign(s) of a chemical change was/were_______
Based on the properties observed, the two gases produced were _______ and _______
A different product was produced at each electrode because _______________________________
Plot a graph of the “Observations”.
The ratio of the volumes between the two gases was ___: ___ . This occurred because _______________

5. Conclusion: In water, the ratio of __________to _________ is __:__
Conclusion: In water, the ratio of __________to _________ is __:__. The chemical or molecular formula for water is ________ . Water can also be illustrated with the following ball and stick representation: The conclusion supports/does not support the hypothesis.

6. Ball and Stick Representations
An atoms is symbolized by a ball and the “glue” or chemical bond that holds them together is represented by a stick. i.e. Ball and stick for methane, CH4 H C H H H