Question

identifying types of chemical reactions
identify the reaction type for each generic chemical equation.
a + b → ab:
ab → a + b:
hydrocarbon + o₂ → co₂ + h₂o:
ab + cd → ad + cb:

Explanation:

Step1: Analyze \( A + B

ightarrow AB \)
A combination reaction (synthesis reaction) occurs when two or more substances combine to form a single product. Here, \( A \) and \( B \) combine to form \( AB \), so this is a combination reaction.

Step2: Analyze \( AB

ightarrow A + B \)
A decomposition reaction is when a single compound breaks down into two or more simpler substances. Here, \( AB \) breaks down into \( A \) and \( B \), so this is a decomposition reaction.

Step3: Analyze \( \text{Hydrocarbon} + \text{O}_2

ightarrow \text{CO}_2 + \text{H}_2\text{O} \)
A combustion reaction involves a substance reacting with oxygen, usually producing carbon dioxide and water (for hydrocarbons). The hydrocarbon reacts with \( \text{O}_2 \) to form \( \text{CO}_2 \) and \( \text{H}_2\text{O} \), so this is a combustion reaction.

Step4: Analyze \( AB + CD

ightarrow AD + CB \)
A double - displacement reaction (metathesis) occurs when the positive and negative ions of two ionic compounds exchange places to form two new compounds. Here, the ions in \( AB \) and \( CD \) exchange ( \( A \) pairs with \( D \), \( C \) pairs with \( B \)) to form \( AD \) and \( CB \), so this is a double - displacement reaction.

Answer:

• \( A + B

ightarrow AB \): Combination (Synthesis) Reaction

• \( AB

ightarrow A + B \): Decomposition Reaction

• \( \text{Hydrocarbon} + \text{O}_2

ightarrow \text{CO}_2 + \text{H}_2\text{O} \): Combustion Reaction

• \( AB + CD

ightarrow AD + CB \): Double - Displacement (Metathesis) Reaction