Electrolysis of Water

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)

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

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 _______________

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.

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