A reaction in the laboratory yields 5.98 g KAl(SO4)2.  How many moles of potassium aluminum sulfate were produced? A reaction in the laboratory yields 5.98 g KAl(SO4)2.  How many moles of potassium aluminum sulfate were produced?

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 just learnt this recently but i need to look through my notes again

the answer is 1 i believe