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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.
Para determinar las propiedades químicas, debemos identificar cambios que involucran reacciones químicas (formación de nuevas sustancias).
- A magnet is attracted to a piece of metal: Es una propiedad física (atracción magnética, sin cambio químico).
- A wire sags when weight is attached: Propiedad física (deformación, sin cambio químico).
- Silver tarnishes...: El plata se oxida (reacciona con oxígeno), formando una nueva sustancia (óxido de plata) → propiedad química.
- Water heated...: Evaporación es un cambio físico (cambio de estado, sin nueva sustancia) → propiedad física.
- Diesel fuel burns...: La combustión del diésel produce dióxido de carbono, agua, etc. (nuevas sustancias) → propiedad química.
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- Silver tarnishes and becomes black when exposed to oxygen
- Diesel fuel burns when it is heated