Properties and Alloys of Metals

Mr. Anderson's video on metallic solids covers the electron sea model, explaining how free electrons give metals their properties like conductivity, ductility, and malleability. The video discusses the formation of alloys, including interstitial and substitutional types, using examples like brass and stainless steel. It highlights how different atoms in alloys can alter properties, such as preventing rust in stainless steel. The video concludes with a review of the electron model and its role in predicting metal properties.

What is an alloy formed by mixing gold and silver called?

• Brass

• Steel

• Bronze

• Electrum

What is the primary feature of the electron sea model in metals?

• Free-moving electrons

• No electrons

• Fixed electrons

• Electrons bound to protons

What type of alloy is formed by filling holes in the metal lattice with smaller atoms?

• Metallic

• Covalent

• Interstitial

• Substitutional

Which property of metals allows them to be stretched into wires?

• Ductility

• Brittleness

• Malleability

• Conductivity

Why are metals good conductors of electricity?

• They have bound electrons

• They have no electrons

• They have fixed electrons

• They have free-moving electrons

What property of metals is due to the presence of free electrons on their surface?

• Brittleness

• Shininess

• Rigidity

• Opacity

What is an example of a substitutional alloy?

• Steel

• White gold

• Brass

• Electrum

What is added to iron to form stainless steel?

• Zinc

• Chromium and nickel

• Silver

• Carbon

Which type of alloy involves replacing one metal atom with another of similar size?

• Ionic

• Interstitial

• Substitutional

• Metallic

What prevents stainless steel from rusting?

• High density

• Absence of oxygen

• Presence of chromium and nickel

• Presence of carbon