Multiple Choice
Which of the following chemical equations correctly represents the combustion of sulfur to produce sulfur dioxide?
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3. Chemical Reactions
Combustion Analysis
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After a strip of magnesium ribbon is reacted completely with air, which product is most likely to be formed?
A
MgO
B
MgCO_3
C
MgCl_2
D
MgSO_4
Verified step by step guidance1
Identify the elements present in the reactants. Magnesium (Mg) is a metal, and air primarily contains oxygen (O_2) and nitrogen (N_2), with oxygen being the reactive component here.
Consider the typical reactions of magnesium with components of air. Magnesium is highly reactive and readily reacts with oxygen to form an oxide.
Write the balanced chemical equation for the reaction of magnesium with oxygen: \$2\,Mg + O_2 \rightarrow 2\,MgO$.
Analyze the other options: MgCO_3 (magnesium carbonate) forms from magnesium reacting with carbonates, MgCl_2 (magnesium chloride) forms from reaction with chlorine, and MgSO_4 (magnesium sulfate) forms from reaction with sulfuric acid or sulfates, none of which are present in air.
Conclude that the most likely product formed when magnesium reacts completely with air is magnesium oxide, MgO.
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