Practise MYP Chemistry questions on 4.4 Alloys and review the explanations to check your understanding.
Use these questions for topic practice and to find ideas you want to revisit in your notes or lessons.
In a molecule, individual bond dipoles may cancel out if the molecule has a __________ geometry, making the molecule non-polar overall. In a similar conceptual way, the properties of a metal are changed when the __________ of the lattice is disrupted by alloying.
Which statement best describes the electrical properties of an alloy compared to its parent pure metal?
True or False: According to the textbook, the development of longer-lasting, corrosion-resistant alloys contributes to sustainability by reducing the need for material replacement.
In the production of steel, small carbon atoms occupy the __________ within the iron lattice, significantly increasing the metal's hardness.
In an interstitial alloy like steel, how do the smaller carbon atoms contribute to the material's increased hardness?
linear, temperature
symmetrical, regularity
asymmetrical, mass
bent, conductivity
Alloys are insulators because they lack delocalised electrons
Alloys only conduct electricity when they are in the molten state
Alloys conduct electricity better because they contain more types of atoms
Alloys still conduct electricity but generally have lower conductivity than pure metals
True
False
valence bands
electron shells
interstices
substitutional sites
By increasing the total number of delocalised electrons
By forming ionic bonds with the iron cations
By filling the gaps between iron atoms and hindering the sliding of layers
By reacting with iron to form a soft, protective coating
