Learning goal 2: Determine which of the following word equations describes a double displacement reaction. magnesium carbonate → magnesium oxide + carbon dioxide gascopper oxide + carbon → copper metal + carbon dioxide gasmagnesium nitrate + sodium hydroxide → magnesium hydroxide + sodium nitratemethane gas + oxygen gas → carbon dioxide gas + water vapour
Question
Learning goal 2: Determine which of the following word equations describes a double displacement reaction. magnesium carbonate → magnesium oxide + carbon dioxide gascopper oxide + carbon → copper metal + carbon dioxide gasmagnesium nitrate + sodium hydroxide → magnesium hydroxide + sodium nitratemethane gas + oxygen gas → carbon dioxide gas + water vapour
Solution
A double displacement reaction, also known as a metathesis reaction, is a type of chemical reaction where two compounds react, and positive ions (cations) and the negative ions (anions) from the two reactants switch places, forming two new compounds.
Let's analyze each equation:
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Magnesium carbonate → magnesium oxide + carbon dioxide gas: This is a decomposition reaction, not a double displacement reaction. One compound breaks down into two or more simpler substances.
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Copper oxide + carbon → copper metal + carbon dioxide gas: This is a redox reaction, specifically a reduction reaction, not a double displacement reaction. The carbon reduces the copper oxide to copper metal.
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Magnesium nitrate + sodium hydroxide → magnesium hydroxide + sodium nitrate: This is a double displacement reaction. The magnesium from magnesium nitrate and the sodium from sodium hydroxide switch places to form magnesium hydroxide and sodium nitrate.
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Methane gas + oxygen gas → carbon dioxide gas + water vapour: This is a combustion reaction, not a double displacement reaction. A hydrocarbon (in this case, methane) reacts with oxygen to produce carbon dioxide and water.
So, the word equation that describes a double displacement reaction is: magnesium nitrate + sodium hydroxide → magnesium hydroxide + sodium nitrate.
Similar Questions
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