Metallic Elements and Alloys

What are the general properties of metallic elements?

• Opaque, good conductors of heat but poor conductors of electricity, rigid, high melting but low boiling points

• Dull, insulators of heat and electricity, flexible, low melting and boiling points

• Luster, good conductors of heat and electricity, malleable and ductile, high melting and boiling points

• Transparent, poor conductors of heat and electricity, brittle, low melting and boiling points

Name two types of alloys and briefly describe their composition.

• 2. Copper - composed of copper and aluminum.

• 1. Aluminum - composed of iron and carbon.

• 1. Brass - composed of copper and zinc. 2. Stainless steel - composed of iron, chromium, nickel, and other elements.

• 3. Bronze - composed of iron and zinc.

What are the uses of copper in various industries?

• Copper is used in the fashion and beauty industry

• Copper is used in the entertainment and media industry

• Copper is used in construction, electrical, electronics, transportation, and healthcare industries.

• Copper is used in the food and beverage industry

How does the composition of steel differ from that of brass?

• Steel is primarily made of aluminum with a small amount of nickel, while brass is a combination of lead and tin.

• Steel is primarily iron with a small amount of carbon, while brass is a combination of copper and zinc.

• Steel is a combination of copper and zinc, while brass is primarily iron with a small amount of carbon.

• Steel is primarily copper with a small amount of zinc, while brass is a combination of iron and carbon.

Explain the effects of impurities on the properties of an alloy.

• Impurities can affect the strength, ductility, and corrosion resistance of an alloy.

• Impurities improve the corrosion resistance of an alloy

• Impurities make the alloy stronger and more ductile

• Impurities have no effect on the properties of an alloy

What are the properties of aluminum that make it suitable for aircraft construction?

• Lightweight, strong, and good corrosion resistance

• Soft, flimsy, and easily tarnished

• Expensive, brittle, and easily deformed

• Heavy, weak, and prone to rust

How do metallic elements conduct electricity?

• By absorbing light energy

• Movement of free electrons within their structure

• By emitting protons

• By creating a magnetic field

Which element is NOT burning very strongly in air to form oxide?

• Sodium

• Calcium

• Magnesium

• Alumunium

Which metal does NOT react with steam when heated to give hydrogen?

• Aluminium

• Zinc

• Iron

• Copper

Which metal does not react with water and acid but react slowly to form oxide layer when heated?

• lead

• sodium

• gold

• silver