10/24/14
fic current is passed through water and bubbles start forming. what is a logical conclusion
for the bubbles?
a) water is evaporating.
b) the water had impurities in it.
c) a physical changes has occurred.
d) hydrogen and oxygen are being formed.

d = Hydrogen and oxygen are being formed.

Explanation:

When current is passed through the water electrolysis take place.

Water is splitted into hydrogen and oxygen gas. Because of this formation bubbles are formed.

At cathode:

2H₂O + 2e⁻  → H₂ + 2OH⁻

Cathode is negatively charged and reduction take place on it.

At anode:

4OH⁻ → O₂ + 2H₂O + 4e⁻

Anode is positively charged and oxidation take place on it.

The over all reaction can be written as:

Chemical equation:

2H₂O  (electricity) →  2H₂  +  O₂

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.