Multiple Choice
During the complete combustion of one molecule of methane (CH_4), how many covalent bonds are broken in the reactant molecules before new bonds are formed in the products?
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3. Chemical Reactions
Combustion Analysis
Multiple Choice
Which of the following is always a reactant in a combustion reaction?
A
CO_2
B
N_2
C
O_2
D
H_2O
Verified step by step guidance1
Understand what a combustion reaction is: it is a chemical reaction where a substance (usually a hydrocarbon or other organic compound) reacts with oxygen to produce energy, typically in the form of heat and light.
Identify the common reactants in combustion reactions: the fuel (such as a hydrocarbon) and oxygen gas (\(\mathrm{O_2}\)).
Recognize that oxygen (\(\mathrm{O_2}\)) is essential because it acts as the oxidizing agent that combines with the fuel to produce combustion products.
Note that \(\mathrm{CO_2}\) and \(\mathrm{H_2O}\) are typically products of combustion, not reactants.
Understand that \(\mathrm{N_2}\) is often present in the air but does not usually react in combustion; it is not a required reactant.
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