Abuffer is generated using nh3 and nh4cl. which of the following is true?
a.) any buffers generated for which [nh3]/[nh4cl] is the same will have identical ph
b.) if [nh3]=[nh4cl], the ph will equal the pka for nh3
c.) any buffers generated for which [nh3]/[nh4cl] is the same will have an identical buffering capacity
d.) if [nh3]/[nh4cl] in buffer 1 is greater than buffer 2, then buffer 1 will have a greater buffering capacity

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.

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).

i think that the answer is c