IBDP Official Exam Material
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Topic 4: Chemical bonding and structure
For both SL and HL students
1. [1 mark]
Which molecule is polar?
A. BeH2
B. AlH3
C. PH3
D. SiH4
2. [1 mark]
Which structure of CF2Cl2 is shown with correct bond and molecular dipoles?
3. [1 mark]
Alloying a metal with a metal of smaller atomic radius can disrupt the lattice and make it more difficult for atoms to slide over each other. Which property will increase as a result?
A. Electrical conductivity
B. Ductility
C. Malleability
D. Strength
4. [1 mark]
Chlorofluorocarbons (CFCs) contain bonds of the following lengths:
C—C = 1.54 × 10−10 m
C—F = 1.38 × 10−10 m
C—Cl = 1.77 × 10−10 m
What is the order of increasing bond strength in the CFC molecule?
A. C—C < C—F < C—Cl
B. C—C < C—Cl < C—F
C. C—Cl < C—C < C—F
D. C—F < C—C < C—Cl
5. [1 mark]
Which molecule can be represented by resonance structures?
A. H2S
B. HNO3
C. H2O2
D. HClO
6. [1 mark]
What is the explanation for the high melting point of sodium chloride?
A. The covalent bond between sodium and chlorine atoms is strong.
B. Electrostatic attraction between sodium and chloride ions is strong.
C. Intermolecular forces in sodium chloride are strong.
D. Delocalized electrons cause strong bonding in sodium chloride.
7. [1 mark]
Which molecule is most polar?
A. CF4
B. CCl4
C. CHF3
D. CClF3
8. [1 mark]
For which species can resonance structures be drawn?
A. HCOOH
B. HCOO–
C. CH3OH
D. H2CO3
9. [1 mark]
A compound consists of the ions Ca2+ and PO43–. What are the name and formula of the compound?
10. [1 mark]
What is the type of bonding in a compound that has high boiling and melting points, poor electrical conductivity, and low solubility in water?
A. Ionic
B. Molecular covalent
C. Metallic
D. Giant covalent
11. [1 mark]
What is the name of the compound with formula Ti3(PO4)2?
A. Titanium phosphate
B. Titanium(II) phosphate
C. Titanium(III) phosphate
D. Titanium(IV) phosphate
12. [1 mark]
What is the main interaction between liquid CH4 molecules?
A. London (dispersion) forces
B. Dipole–dipole forces
C. Hydrogen bonding
D. Covalent bonding
13. [1 mark]
Which statement best describes the intramolecular bonding in HCN (l)?
A. Electrostatic attractions between H+ and CN− ions
B. Hydrogen bonding
C. Van der Waals forces and hydrogen bonding
D. Electrostatic attractions between pairs of electrons and positively charged nuclei
14. [1 mark]
Deduce the Lewis (electron dot) structure for the nitrate anion.
15. [2 marks]
Deduce the Lewis (electron dot) structure and shape for dinitrogen monoxide showing nitrogen as the central atom.
16. [4 marks]
State the types of bonding in magnesium, oxygen and magnesium oxide, and how the valence electrons produce these types of bonding.
17.Draw the Lewis (electron dot) structure of the ammonia molecule.
18. [1 mark]
Nitric acid, HNO3, is another strong Brønsted–Lowry acid. Its conjugate base is the nitrate ion, NO3−
Draw the Lewis structure of NO3−.
19. [2 marks]
Explain the electron domain geometry of NO3−.
20. [1 mark]
Carbon forms many compounds.
C60 and diamond are allotropes of carbon.
Outline one difference between the bonding of carbon atoms in C60 and diamond.
21. [2 marks]
Explain why C60 and diamond sublime at different temperatures and pressures.
22. [1 mark]
Which compound contains both ionic and covalent bonds?
A. CH3COONa
B. CH3COOH
C. K2O
D. CaCl2
23. [1 mark]
The following compounds have similar relative molecular masses. What is the order of increasing boiling point?
A. CH3CH2CH2OH < CH3CH2CHO < CH3COOH
B. CH3CH2CHO < CH3CH2CH2OH < CH3COOH
C. CH3CH2CHO < CH3COOH < CH3CH2CH2OH
D. CH3COOH < CH3CH2CHO < CH3CH2CH2OH
24. [1 mark]
Which alcohol is least soluble in water?
A. CH3OH
B. CH3CH2OH
C. CH3CH2CH2OH
D. CH3CH2CH2CH2OH
25. [1 mark]
Which series is in order of increasing boiling point?
A. CH2CH2CH3OH CH3COCH3 CH3CH2CH3
B. CH3CH2CH3 CH3COCH3 CH2CH2CH3OH
C. CH3COCH3 CH2CH2CH3OH CH3CH2CH3
D. CH3CH2CH3 CH2CH2CH3OH CH3COCH3
26. [1 mark]
Along which series is the bond angle increasing?
A. NH3 H2O CH4
B. CH4 NH3 H2O
C. H2O NH3 CH4
D. H2O CH4 NH3.
30. [1 mark]
Which series is in order of increasing boiling point?
A. CH2CH2CH3OH CH3COCH3 CH3CH2CH3
B. CH3CH2CH3 CH3COCH3 CH2CH2CH3OH
C. CH3COCH3 CH2CH2CH3OH CH3CH2CH3
D. CH3CH2CH3 CH2CH2CH3OH CH3COCH3
If you need the markscheme, including the examiners' reports for each question, and more exam and teaching materials on this topic, contact me through the contact page