Question

plz help me with this Hw because I am not understanding​

Answer 1

LUSTRE

Metals - Metals have the quality of reflecting light from their surface and can be polished, e.g., gold. silver, and copper.

Non-metals - These have no metallic lustre and do not reflect light.

HARDNESS

Metals - Metals are solid at room temperature with the exception of mercury, which is liquid at room temperature (Gallium is liquid on hot days).

Non-metals - Most of the non-metals exist in two of the three states of matter at room temperature: gases (oxygen) and solids (carbon). Only bromine exists as a liquid at room temperature.

DUCTILITY

Metals - Metals can be drawn into wires. For example, 100g of silver can be drawn into a thin wire about 200m long.

Non-metals - Non-metals are very brittle, and cannot be rolled into wires or pounded into sheets.

MALLEABILITY

Metals - Metals have the ability to withstand hammering and can be made into thin sheets known as foils. For example, a sugar-cube-sized chunk of gold can be pounded into a thin sheet that will cover a football field.

Non-metals - These are non-malleable, which means that they cannot be pounded into sheets.

THERMAL CONDUCTIVITY

Metals - Metals are good conductors of heat. There are two reasons for this: the close packing of the metal ions in the lattice, and the delocalized electrons can carry kinetic energy through the lattice.

Non-metals - Most non-metals are poor conductors of heat. In fact, they are such poor conductors of heat that they are often used for insulation.

ELECTRICAL CONDUCTIVITY

Metals - Metals are good conductors of electricity. Silver has the highest electrical conductivity of all metals.

Non-metals - Non-metals are poor conductors of electricity. Graphite is an exception here. In fact, it is a very good conductor of electricity.