Question

the reaction of copper(ii)oxide breaking up to give copper element and oxygen can be classified as: 1) oxidation-reduction and precipitation 2) oxidation-reduction and decomposition 3) precipitation and synthesis 4) synthesis and acid-base reaction

Explanation:

1. First, analyze the reaction type: The reaction is \( 2CuO

ightarrow 2Cu + O_2 \). This is a decomposition reaction (a compound breaks into simpler substances).

1. Then, check for oxidation - reduction: Copper in \( CuO \) (oxidation state +2) becomes \( Cu \) (0), and oxygen in \( CuO \) (-2) becomes \( O_2 \) (0), so there is a change in oxidation states, meaning it is an oxidation - reduction reaction.
2. Now, eliminate other options:

• Option 1: Precipitation reactions involve the formation of a solid from a solution, which is not the case here.
• Option 3: Precipitation and synthesis (synthesis is combining substances, opposite of what's happening here) are incorrect.
• Option 4: Synthesis (combining) and acid - base (involves acids and bases) are incorrect.

Answer:

1. Oxidation - reduction and Decomposition