Which of the following hypotheses cannot be tested using the scientific method 1.if the temperature is increased, the reaction rate of hcl and naoh will increase. 2.cold weather causes car tires to deflate. 3/the bombing of hiroshima ended world war ii. 4.if students do more homework their grades will improve.

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.