Balancing Chemical Equations Video Lessons

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Concept: Balancing Chemical Reactions

Problem: Write a balanced chemical equation for the following and classify the reaction. Aluminum metal and sulfuric acid yield aqueous aluminum sulfate and hydrogen gas.

FREE Expert Solution

Before balancing the chemical reaction, let’s first write the chemical formula of each of the compounds involved in the reaction.


Reactants:

Aluminum metal

• Aluminum is in its elemental state as a metal → Al(s)

• It has 0 oxidation state


Sulfuric Acid

• Sulfuric acid is an oxyacid

• It is made up of H+ and the sulfate ion SO42-

When ions combine, their charges or oxidation numbers crisscross to become subscripts

          • H+ will have a subscript of 2 fromSO42- → H2

          • SO42- will have a subscript of 1 from H+ → SO4

          • Subscript 1 is no longer indicated → H2SO4(aq)

Recall: SO4- are soluble except when paired with Ca2+, Sr2+, Ba2+, Ag+, Pb2+


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Problem Details

Write a balanced chemical equation for the following and classify the reaction. 

Aluminum metal and sulfuric acid yield aqueous aluminum sulfate and hydrogen gas.

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