Properties and Characteristics of Alloys

Mr. Poly introduces alloys, discussing their properties and types, including interstitial and substitutional alloys. He explains surface alloys and galvanization, using examples from the Marvel Universe. The video covers the effects of interstitial alloys on density and flexibility, and substitutional alloys like brass. The tutorial concludes with a summary of key points.

What is an alloy?

• A pure metal

• A mixture of two or more metals

• A type of chemical compound

• A single element

Which of the following is NOT a property of surface alloys?

• They prevent rusting

• They increase the weight of the metal

• They form a protective layer

• They are a mixture of metals

Which element is commonly used in the galvanization process?

• Copper

• Zinc

• Iron

• Aluminum

What is the effect of zinc oxide on the surface of galvanized iron?

• It changes the color of the surface

• It makes the surface shiny

• It prevents the surface from crumbling

• It increases the surface temperature

What happens to the density of a metal when small atoms fit in the spaces between larger metal atoms?

• The density decreases

• The density remains the same

• The density increases

• The density fluctuates

Which property is affected by the presence of small atoms in interstitial alloys?

• Magnetism

• Conductivity

• Color

• Flexibility

What is the main characteristic of interstitial alloys?

• Atoms are replaced by larger atoms

• Small atoms fit between larger atoms

• Atoms are removed to create space

• Atoms are rearranged in a new pattern

What does the term 'substitutional' in substitutional alloys refer to?

• Adding more atoms

• Removing atoms

• Replacing one atom with another of similar size

• Changing the color of the alloy

Which of the following is an example of a substitutional alloy?

• Steel

• Aluminum

• Brass

• Bronze

Which property is similar in both interstitial and substitutional alloys?

• Flexibility

• Conductivity

• Color

• Weight