Which one of the following is a combustion reaction?
A. CH4 + 2 O2 CO2 + 2 H2O
B. HBr + NaOH NaBr + H2O
C. Xe (aq) + H2O(l) HXe(aq) + OH- (aq)
D. NaCl (aq) + AgNO3 (aq) NaNO3 (aq) + AgCl (s)
I'd have to go with A. Burn methane to get carbon dioxide and water.
C and D are aqueous, so there's no chance there.
hydrogen bromide and lye? Don't think so! ...
In order to determine which of the given reactions is a combustion reaction, we need to understand what a combustion reaction is.
A combustion reaction is a chemical reaction that involves the combination of a fuel (usually a hydrocarbon) with oxygen gas (O2), resulting in the production of carbon dioxide (CO2) and water (H2O). This type of reaction is commonly associated with the release of heat and light.
Let's analyze each of the given options to identify the combustion reaction:
A. CH4 + 2 O2 -> CO2 + 2 H2O
This equation represents the complete combustion of methane (CH4), a hydrocarbon, with oxygen gas. It produces carbon dioxide and water. Therefore, option A is a combustion reaction.
B. HBr + NaOH -> NaBr + H2O
This is a neutralization reaction between hydrobromic acid (HBr) and sodium hydroxide (NaOH), resulting in the formation of sodium bromide (NaBr) and water (H2O). It is not a combustion reaction.
C. Xe (aq) + H2O(l) -> HXe(aq) + OH- (aq)
This is a reaction between xenon gas (Xe) and water (H2O) that produces a xenon compound (HXe) and hydroxide ions (OH-). It is not a combustion reaction.
D. NaCl (aq) + AgNO3 (aq) -> NaNO3 (aq) + AgCl (s)
This equation represents a double displacement reaction, where sodium chloride (NaCl) reacts with silver nitrate (AgNO3) to form sodium nitrate (NaNO3) and silver chloride (AgCl), which is a precipitate. It is not a combustion reaction.
Therefore, the correct answer is A. CH4 + 2 O2 CO2 + 2 H2O, which represents a combustion reaction.