Physical Properties of Metals

All metals have the same degree of hardness.

• TRUE

• FALSE

Answer explanation

Hardness varies from one metal to another. It is generally characterized by strong intermolecular forces. In fact, there is an existing chart for the hardness of metal, the Rockwell Hardness Scale Chart.

Metals can be drawn into wires because they are ____ in nature.

• Hard

• Malleable

• Ductile

• Luster

Answer explanation

Ductility is the ability of metals to be drawn into thin wire. Its structure is consists of layers of metal ions, that can slide over each other when a force is applied. Metallic bonding allows the metal to change shape without breaking/snapping.

Metals are found above the surface of the Earth.

• TRUE

• FALSE

Answer explanation

Metals are found below the surface of the Earth. These are natural compounds of Earth’s crust, in which they are generally found in the form of metal ores.

Some metals are listed in ____.

• Table of Contents

• Periodic Table of Metals

• Table of Metals

• Periodic Table of Elements

Answer explanation

In the Periodic Table of Elements, about 75% of the chemical elements are metals. Out of the 118 known elements, 91 are metals. Only few can be crafted into tools because some are special and uncommon in nature.

Metals are used in making cooking utensils because they are good conductor of ____.

• Electricity

• Heat

• Sound

• Energy

Answer explanation

Metals are particularly good conductors of heat because their particles are very closely packed so the vibrations are passed on very quickly.

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Which of the following metals are good material for making bells?

I. Copper

II. Iron

III. Aluminum

IV. Tin

• I and II

• I and IV

• II and III

• III and IV

Answer explanation

Bell metal is a type of bronze that contains about 80% of copper and small amounts of zinc and lead. It also contains about 20% of tin. The addition of tin to the bronze is vital to create the resonance, or quality, of sound that mimics a vibrating string.

Tags

NGSS.MS-PS4-1

Metals produce sounds when connected to an electric socket.

• TRUE

• FALSE

Answer explanation

Metals produce sound when struck by something. It is capable of giving a deep, resonant sound. Metals are sonorous because electron bonding in metals is highly delocalized due to very low electro negativity.

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

What physical property of metals causes it to have a shiny appearance?

• Malleability

• Sonorous

• Luster

• Ductility

Answer explanation

Electrons move freely in the metal causing any light incident on them to get reflected back. This is specular reflection rather than diffused, thus the metal surface appears shiny or lustrous.

Metals cannot be beaten into sheets because they are hard.

• TRUE

• FALSE

Answer explanation

Metals are malleable. Like in ductility, metallic bonding allows the metal to change shape without breaking or shattering.

Which of the following statements is/are true about metals?

I. Metals have physical properties.

II. Metals have chemical properties.

III. None of the above.

• I only.

• II only.

• III only.

• I and II only.

Answer explanation

Metals have both physical and chemical properties. Physical involves the changes in the structure and appearance. Chemical involves the changes due to chemical reactions.