Question

which of the following is a chemical property of copper?
a it is a good conductor of heat and electricity.
b it melts when heated to 1083°c.
c it has a shiny metallic luster
d it reacts in moist air to produce green copper carbonate.

Explanation:

To determine the chemical property of copper, we distinguish between physical and chemical properties. Physical properties (like conductivity, melting point, luster) can be observed without a chemical reaction. Chemical properties involve reactions (e.g., with air).

• Option A: Conductivity is a physical property (no reaction needed to observe).
• Option B: Melting point is a physical property (phase change, no new substance).
• Option C: Luster is a physical property (appearance, no reaction).
• Option D: Reacting in moist air to form copper carbonate involves a chemical reaction (new substance formed), so it is a chemical property.

Answer:

D. It reacts in moist air to produce green copper carbonate.