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IBChemistryDPSLExam QuestionsModels of Bonding & StructureFrom Models to Materials

From Models to Materials (DP IB Chemistry: SL): Exam Questions

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From Models to Materials

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1a1 mark

State why elements are found at the bottom of a triangular bonding diagram.

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1b2 marks

Suggest the position of ionic and covalent materials within a triangular bonding diagram. Explain your answer. 

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1c2 marks

Name the x-axis and y-axis on a standard triangular bonding diagram.

x-axis: ..................................................

y-axis: ..................................................

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1d1 mark

Using sections 9 and 17 of the data booklet, plot nitrogen trifluoride (NF3) on the triangular bonding diagram.

Graph showing a triangular plot with "Difference in electronegativity" on the y-axis and "Average electronegativity" on the x-axis.

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2a2 marks

Repeating monomer units can be manipulated in various ways to give polymers with different properties.

i) Draw the structural formula of 2-chloropropene.

[1]

ii) Deduce the repeating unit of poly(2-chloropropene).

[1]

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2b1 mark

Poly(2-chloropropene) is formed by the addition polymerisation of 2-chloropene. Deduce the percentage atom economy for this polymerisation reaction.

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2c4 marks

Poly(2-chloropropene) is a strong, unreactive, and water-resistant material.

i) Explain why the polymer is strong.

[1]

ii) Explain why the polymer is unreactive.

[1]

iii) Explain why the polymer is water-resistant.

[1]

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1a3 marks

The type of bonding and percentage ionic / covalent character of binary compounds can be deduced using triangular bonding diagrams.

Using section 9 of the data booklet, complete the table by calculating Σχ and Δχ for the given compounds.

Compound

Σχ

Δχ

Ammonia

 

 

Graphite

 

 

Silicon dioxide

 

 

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1b3 marks

Use data from sections 9 and 17 of the data booklet to percentage covalent character and bonding type in the following compounds:

i) BBr3 

[1]

ii) BeH2 

[1]

iii) SrMg

[1]

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1c1 mark

Deduce the element that is found in the bottom left of a triangular bonding diagram by using sections 9 and 17 of the data booklet.

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1a3 marks

Substances A, B and C are located in the bonding triangle as shown.

a-b-c-bonding-triangle-diagram

Suggest, giving a reason, a physical property that substances A and B would have in common.

Use the bonding triangle and section 17 of the data booklet.

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1b2 marks

Substance A is an alloy containing a Group 1 metal and a Group 2 metal.

Identify the constituent metals in substance A, giving a reason.

Use the bonding triangle in (a) and section 9 of the data booklet.

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1c3 marks

Silicon tetrachloride, SiCl4, is a simple molecular substance, that is used to produce high purity silicon and silica for commercial applications. 

Explain whether silicon tetrachloride would be expected to have a higher or lower boiling point than substance C.

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23 marks

The structure shows a section of a polymer found in some plastics.

1-14

i) State the type of polymerisation involved in forming this polymer.

[1]

ii) Draw the repeating unit for this polymer.

[1]

iii) Name the monomer used to form this polymer.

[1]

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