Nthis example we will use the quantization of charge to determine the number of excess electrons in an object. (a) a large plastic block has a net charge of −1.0μc=−1.0×10−6c. how many more electrons than protons are in the block? (b) when rubbed with a silk cloth, a glass rod acquires a net positive charge of 1.0 nc. if the rod contains 1.0 mole of molecules, what fraction of the molecules have been stripped of an electron? assume that at most one electron is removed from any molecule.

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

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.

50.23 i believe is correct but don't quote me on that.