2 g (an excess) of iron is added to 50 cm3 of 0.5 M sulfuric acid. When the reaction is over, the reaction mixture is filtered. The mass of the unreacted iron is found to be 0.6 g. (Ar: Fe = 56.) a. What mass of iron took part in the reaction?
b. How many moles of iron atoms took part?
c. How many moles of sulfuric acid reacted?
d. Write the equation for the reaction, and deduce the charge on the iron ion that formed.
e. What volume of hydrogen (calculated at itp) bubbled off during the reaction?

not clear

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.

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