g Compare the average number of bubbles produced in the clear and control tubes. (1) State which condition had more bubbles generated? (2) How did the presence or absence of baking soda (sodium bicarbonate) affect the bubble production?Both questions must be answered to earn full points.

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.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a