Question

select all the correct answers.
properties of substances can be classified as physical or chemical properties. which statements describe chemical properties?

a magnet is attracted to a piece of metal.
a wire sags when weight is attached to it.
silver tarnishes and becomes black when exposed to oxygen.
water heated over a flame begins to bubble and evaporate.
diesel fuel burns when it is heated.

Explanation:

To determine chemical properties, we identify processes involving chemical changes (formation of new substances).

• "A magnet is attracted to a piece of metal" is a physical property (magnetic attraction, no new substance).
• "A wire sags when weight is attached" is a physical property (deformation, no new substance).
• "Silver tarnishes and becomes black when exposed to oxygen" involves silver reacting with oxygen to form silver sulfide (new substance, chemical property).
• "Water heated over a flame begins to bubble and evaporate" is a physical change (state change, no new substance).
• "Diesel fuel burns when it is heated" involves combustion (reaction with oxygen, new substances like CO₂, H₂O, chemical property).

Answer:

C. Silver tarnishes and becomes black when exposed to oxygen, E. Diesel fuel burns when it is heated