Consider three generic acids: HX , HY , and HZ . The number of H plus and X minus ions in solution is equal to the initial number of HX molecules added to the solution. One quarter of the HZ molecules form H plus and Z minus ions in solution. The other three quarters of the molecules remain as HZ in solution. One half of the HY molecules form H plus and Y minus ions in solution. The other half of the molecules remain as HY in solution. Arrange the acids according to strength. Strongest acid Weakest acid Answer Bank

The strongest acid is HX, while the weakest is HZ.

Explanation: When we add water to an acid, the acid dissolves and dissociates. The reaction is: ⇒ . If it completely dissociates, it is a strong acid. If not, is a weak acid.

For HX, the question says the number of H and X is equal to the initial number HX, which means that all the dissociated. Thus, HX is a strong acid.

For HY, a half of molecules form ions, in other words, not all is dissociated, so HY is a weak acid.

For HZ, only a quarter of molecules form ions, so not all is dissociated, thus another weak acid.

Comparing HZ and HY, HZ is the weakest acid, since less molecules dissociated in water.

Arraging the acids from strongest to weakest will be HX, HY and HZ.

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.