Materials: Metals and Non-Metals– 3_1

There are three materials X, Y and Z. X and Z are hard and shiny, but Y is dull and not very hard. Identify the metals and non-metals from X, Y and Z.What is the first statement of the audio clip?

• X and Z are metals.

• Y is non-metal

There are three materials X, Y and Z. X and Z are hard and shiny, but Y is dull and not very hard. Identify the metals and non-metals from X, Y and Z.What is the second statement of the audio clip?

• X and Z are metals.

• Y is non-metal

Why wires are made of aluminum and copper and not of carbon and sulphur? What is the first statement of the audio clip?

• Aluminum and copper are metals and can be drawn into wires.

• But carbon and sulphur are non-metals and hence cannot be drawn into thin wires.

Why wires are made of aluminum and copper and not of carbon and sulphur? What is the second statement of the audio clip?

• Aluminum and copper are metals and can be drawn into wires.

• But carbon and sulphur are non-metals and hence cannot be drawn into thin wires.

Why do we store white phosphorus in water? What is the first statement of the audio clip?

• Phosphorus is a very reactive non-metal.

• It catches fire if exposed to air.

• To prevent the contact of phosphorus with atmospheric oxygen, it is stored in water.

Why do we store white phosphorus in water? What is the second statement of the audio clip?

• Phosphorus is a very reactive non-metal.

• It catches fire if exposed to air.

• To prevent the contact of phosphorus with atmospheric oxygen, it is stored in water.

Why do we store white phosphorus in water? What is the third statement of the audio clip?

• Phosphorus is a very reactive non-metal.

• It catches fire if exposed to air.

• To prevent the contact of phosphorus with atmospheric oxygen, it is stored in water.

Why can’t we hold a hot metallic pan without a plastic or wooden handle without getting hurt? What is the first statement of the audio clip?

• Wooden or plastic handles are used for cooking utensils

• because they are bad conductors of heat

• and protects us from being hurt while handling hot things.

Why can’t we hold a hot metallic pan without a plastic or wooden handle without getting hurt? What is the second statement of the audio clip?

• Wooden or plastic handles are used for cooking utensils

• because they are bad conductors of heat

• and protects us from being hurt while handling hot things.

Why can’t we hold a hot metallic pan without a plastic or wooden handle without getting hurt? What is the third statement of the audio clip?

• Wooden or plastic handles are used for cooking utensils

• because they are bad conductors of heat

• and protects us from being hurt while handling hot things.