Which of the given statements best represent what to do in the event of a spill of concentrated sulfuric acid.

a. First, rinse the affected area with copious amount of water.

b. First, rinse the affected area with copious amounts of sodium hydroxide.

c. Second, treat the area with aqueous sodium bicarbonate solution.

d. Second, treat the area with sodium thiosulfate solution.

 Option A and then Option c

Explanation: Because Concentrated Sulphuric acid is a very strong acid and  corrosive, when spilled on the skin, can affect the surface and internal skin. It is necessary to First rinse the affected area with copious amount of water to reduce effect of the acid  and Secondly to treat the area with aqueous sodium bicarbonate solution since it will further neutralize and reduce stinging pain from the acid spill by acting as an alkali or base,

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explanation:

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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.