Chemical Equations Balancing Quiz

In the reaction of chromium plus elemental sulfur to form chromium-3 sulfide, how many chromium atoms are there on the right side?

_Cr + _S₈ ---> _Cr₂S₃

• 24

• 16

• 8

• 32

When mercury oxide decomposes into elemental mercury and oxygen gas, how many oxygen ATOMS are on both sides (when balanced)?

_HgO ---> _Hg + _O₂

• 8

• 2

• 4

• 6

In the reaction of aluminum metal with an aqueous solution of copper II chloride to produce an aqueous solution of aluminum chloride and copper metal, how many chlorine ATOMS are on both sides of the reaction?

_Al + _CuCl₂ --> _AlCl₃ + _Cu

• 12

• 9

• 6

• 3

When potassium chlorate decomposes into potassium chloride and oxygen gas, how many oxygen atoms are there on the right side?

_KClO₃ --> _KCl + _O₂

• 2

• 4

• 6

• 8

In the combustion reaction of ethanol with oxygen gas to produce carbon dioxide and water, how many oxygen atoms are on both sides of the reaction?

_C₂H₅OH + _O₂ --> _CO₂ + H₂O

• 7

• 5

• 6

• 4

In the combustion reaction of propane with oxygen gas to produce carbon dioxide and water, how many carbon atoms are on both sides of the reaction?

_C₃H₈ + _O₂ --> _CO₂ + _H₂O

• 5

• 2

• 10

• 3

In the reaction of ammonia with oxygen gas to produce nitrogen monoxide and water, how many hydrogen atoms are there on both sides of the reaction?

_NH₃ + _O₂ --> _NO + _H₂O

• 14

• 10

• 8

• 12

In the reaction of ammonia with oxygen gas to produce nitrogen monoxide and water, how many nitrogen atoms are there on the right side?

_NH₃ + _O₂ --> _NO + _H₂O

• 5

• 3

• 2

• 4