What does it mean for a substance to have luster?
A. It conducts heat
B. It conducts electricity
C. It is shiny
D. It can be bent into different shapes
C. It is shiny
C. It is shiny. Luster refers to the way a substance reflects light and appears shiny or glossy.
To determine what it means for a substance to have luster, let's break down the options.
A. It conducts heat: Conducting heat refers to the ability of a substance to transfer heat through it. While some substances with luster may also conduct heat, this is not the defining characteristic of luster.
B. It conducts electricity: Conducting electricity refers to the ability of a substance to allow the flow of electrical current. Luster is not directly related to conducting electricity.
C. It is shiny: This is the correct answer. Luster describes the shine or brightness of an object's surface when light reflects off it. Substances with luster are typically described as being shiny or exhibiting a metallic or glossy appearance.
D. It can be bent into different shapes: This refers to the property known as malleability, which relates to a substance's ability to be deformed under compression without breaking. While some substances with luster may also be malleable, this is not the definition of luster.
Therefore, the correct answer is C. It means that a substance is shiny.