S2.4 From models to materials
14 revision questions with answers for S2.4 From models to materials, marked SL. Read them here, or play the set as a class game on the projector. Free to host, and students join with a code.
Diagram placing a compound by average electronegativity and electronegativity difference?
- Periodic table
- Bonding triangleRight answer
- Energy cycle
- Phase diagram
What this set covers
Using the bonding triangle to place compounds by average electronegativity and electronegativity difference, then alloys such as steel and brass, and addition polymers including PVC and poly(propene).
- Common mix-up
- Students often mix up the two axes of the bonding triangle: the vertical axis is the electronegativity difference, while average electronegativity runs along the base.
- Revision tip
- Place CsF and one metal and one covalent example on a blank bonding triangle from memory, then draw the repeating unit for poly(propene).
All 14 questions and answers
Diagram placing a compound by average electronegativity and electronegativity difference?
Answer: Bonding triangle
Quantity on the vertical axis of the bonding triangle?
Answer: Electronegativity difference
Bonding type for a large ΔEN, such as in CsF?
Answer: Ionic
Bonding type for a low average EN and a small ΔEN?
Answer: Metallic
Bonding type for a high average EN and a small ΔEN?
Answer: Covalent
Mixture of a metal with other elements, usually metals?
Answer: Alloy
Alloys are harder than pure metals because different-sized atoms…?
Answer: Prevent layers sliding
Alloy of iron and carbon?
Answer: Steel
Alloy of copper and zinc?
Answer: Brass
Small molecules that join together to form a polymer?
Answer: Monomers
Feature a monomer needs for addition polymerisation?
Answer: C=C double bond
Monomer used to make PVC?
Answer: Chloroethene
Repeating unit of poly(propene)?
Answer: –CH₂–CH(CH₃)–
By-product of an addition polymerisation?
Answer: None
Play it as a class game
Play this set opens it in splycr, where you can host it for your class straight away. Hosting needs no account: put the room code on the projector, and students join from a phone with the code and their first name. Each question plays as multiple choice, and the three wrong options were written for that question.