Which physical properties are characteristic of normal solids?
1)brittle
2)little luster
3)malleable
4)ductile
5)good conductors of heat
I think #1 and #2
I wonder what a normal solid is. That is not a scientific classification. I wonder if the asker meant "metals", as all but 2 are characteristics of metals.
To determine which physical properties are characteristic of normal solids, we can consider each option and analyze its applicability to solids.
1) Brittle: This property refers to the tendency of a material to break or shatter when subjected to stress. Generally speaking, most solids are not considered brittle. They usually exhibit some degree of toughness and can withstand external forces without breaking easily.
2) Little luster: Luster refers to the shininess or reflectivity of a material's surface. While certain solids may have little luster, it is not a characteristic shared by all normal solids. Solids can vary widely in their surface appearance, ranging from highly reflective to dull.
To address the remaining options:
3) Malleability: This property refers to the ability of a material to be deformed and reshaped under compression without breaking. Many solids, such as metals, exhibit malleability and can be easily hammered or rolled into different shapes.
4) Ductility: Ductility is the property of a material to be stretched into thin wires without breaking. Metals (e.g., copper, aluminum, gold) are typically ductile and can be drawn into wires.
5) Good conductors of heat: While this may not be true for all solids, many metals, such as copper and silver, have excellent heat conductivity. They can efficiently transfer heat energy from one point to another.
In summary, the correct options for physical properties characteristic of normal solids are: malleable (3), ductile (4), and good conductors of heat (5).