SL Score. HL Score ! /30 ! /48. Practice Exam: Paper 1 Topic 4: Bonding. Name

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1 Name Practice Exam: Paper 1 Topic 4: Bonding SL SL Score! /30 HL Score! /48 1. What is the correct Lewis structure for hypochlorous acid, a compound containing chlorine, hydrogen and oxygen? A. B. C. D. 2. Which compound forms hydrogen bonds in the liquid state? A. C 2 H 5 OH C. CH 3 CHO B. CHCl 3 D. (CH 3 CH 2 ) 3 N 3. How do the bond angles in CH 4, NH 3 and H 2 O compare? A. CH 4 = NH 3 = H 2 O B. CH 4 < NH 3 < H 2 O C. NH 3 < CH 4 < H 2 O D. H 2 O < NH 3 < CH 4 4. Which combination of the characteristics of element X, a metal, and element Y, a non metal, is most likely to lead to ionic bonding? X A. low ionization energy high electronegativity value B. low ionization energy low electronegativity value C. high ionization energy high electronegativity value D. high ionization energy low electronegativity value Y 1

2 5. Which particles are responsible for electrical conductivity in metals? A. Anions C. Electrons B. Cations D. Protons 6. Which molecule has a non-bonding (lone) pair of electrons on the central atom? A. BF 3 C. CO 2 B. SO 2 D. SiF 4 7. When C 2 H 2, C 2 H 4 and C 2 H 6 are arranged in order of increasing carbon-carbon bond strength (weakest bond first), what is the correct order? A. C 2 H 2, C 2 H 4, C 2 H 6 B. C 2 H 2, C 2 H 6, C 2 H 4 C. C 2 H 6, C 2 H 4, C 2 H 2 D. C 2 H 6, C 2 H 2, C 2 H 4 8. The number of electrons in the valence shell of elements A and B, are 6 and 7 respectively. What is the formula and type of bonding in a compound formed by these elements? A. A 2 B, covalent C. A 2 B, ionic B. AB 2, covalent D. AB 2, ionic 9. Lewis structures are represented in different ways in different parts of the world. Two ways of drawing the Lewis structure for H 3 O + are shown below. Which statement is correct about H 3 O +? A. The ion has a tetrahedral shape. B. The HOH bond angle is 120. C. The HOH bond angle is 90. D. The ion has a trigonal pyramidal shape. 2

3 10. Which statement best describes metallic bonding? A. Electrostatic attractions between oppositely charged ions B. Electrostatic attractions between a lattice of positive ions and delocalized electrons C. Electrostatic attractions between a lattice of negative ions and delocalized protons D. Electrostatic attractions between protons and electrons 11. Which is the best description of the bonding present in the ammonium ion, NH + 4? A. Sharing of electrons between atoms B. Electrostatic attraction between ions C. Electrostatic attraction between positive ions and delocalized electrons D. Sharing of electrons between atoms and electrostatic attraction between ions 12. The formula of cerium(iii) sulfate is Ce 2 (SO 4 ) 3. What is the correct formula of cerium(iii) phosphate? A. CeP C. Ce 3 (PO 4 ) 2 B. Ce 2 (PO 4 ) 3 D. CePO Which molecule has the shortest carbon-oxygen bond length? A. CH 3 COOH B. CH 3 CH 2 OH C. CO 2 D. CO 14. Which pair of compounds is arranged in correct order of relative boiling points? Lower Boiling Point Higher Boiling Point A. H 2 S H 2 O B. NH 3 PH 3 C. HF HCl D. CH 3 COOH CH 3 CH 2 OH 3

4 15. Which statement about the bonding between carbon atoms is correct? A. In C 60 fullerene each carbon atom is covalently bonded to three other carbon atoms. B. In C 60 fullerene each carbon atom is covalently bonded to four other carbon atoms. C. In graphite each carbon atom is covalently bonded to four other carbon atoms. D. In graphite each carbon atom forms a double covalent bond with three other carbon atoms. 16. Which intermolecular forces exist between molecules of carbon monoxide, CO? A. Hydrogen bonds and van der Waals forces B. Dipole-dipole attractions and van der Waals forces C. Van der Waals forces only D. Dipole-dipole attractions only 17. What is the formula of magnesium fluoride? A. Mg 2 F 3 B. Mg 2 F C. Mg 3 F 2 D. MgF What is the shape of the ammonia molecule, NH 3? A. Trigonal planar B. Trigonal pyramidal C. Linear D. V-shaped (bent) 19. Which molecule is polar? A. CH 2 Cl 2 B. BCl 3 C. Cl 2 D. CCl 4 4

5 20. Which substance can form intermolecular hydrogen bonds in the liquid state? A. CH 3 OCH 3 B. CH 3 CH 2 OH C. CH 3 CHO D. CH 3 CH 2 CH Which compound has a covalent macromolecular (giant covalent) structure? A. MgO(s) B. Al 2 O 3 (s) C. P 4 O 10 (s) D. SiO 2 (s) 22. The electronegativities of four different elements are given below (the letters are not their chemical symbols). Element W X Y Z Electronegativity Based on this information which statement is correct? A. W is a non-metal. B. W and X form an ionic compound. C. Y is a metal. D. Y and Z form a covalent compound. 23. Which species contain a dative covalent bond? I. HCHO II. CO III. H 3 O + A. I and II only B. I and III only C. II and III only D. I, II and III 5

6 24. Which substance is made up of a lattice of positive ions and free moving electrons? A. Graphite B. Sodium chloride C. Sulfur D. Sodium 25. Which order is correct when the following compounds are arranged in order of increasing melting point? A. CH 4 < H 2 S < H 2 O B. H 2 S < H 2 O < CH 4 C. CH 4 < H 2 O < H 2 S D. H 2 S < CH 4 < H 2 O 26. What are the correct formulas of the following ions? Ammonium Hydrogencarbonate Phosphate A. + NH 4 B. + NH 3 C. + NH 4 D. + NH 4 HCO 3 2 HCO 3 HCO 3 2 HCO 3 PO 4 3 PO 4 2 PO 4 3 PO What happens when magnesium metal reacts with chlorine gas? A. Each magnesium atom loses two electrons and each chlorine atom gains two electrons. B. Each magnesium atom gains one electron and each chlorine atom loses one electron. C. Each magnesium atom loses two electrons and each chlorine atom gains one electron. D. Each magnesium atom gains one electron and each chlorine atom loses two electrons. 28. Which is the best description of ionic bonding? A. The electrostatic attraction between positively charged nuclei and an electron pair B. The electrostatic attraction between positive ions and delocalized negative ions C. The electrostatic attraction between positive ions and delocalized electrons D. The electrostatic attraction between oppositely charged ions 6

7 29. Which is the best description of the bonding present in silicon dioxide, SiO 2? A. Each silicon atom forms four single covalent bonds to oxygen atoms. B. Each silicon atom forms two double covalent bonds to oxygen atoms. C. Each silicon atom forms two single covalent bonds to oxygen atoms. D. Each silicon atom forms four double covalent bonds to oxygen atoms. 30. Which statement best describes the intramolecular bonding in HCN(l)? A. Electrostatic attractions between H + and CN ions B. Only van der Waals forces C. Van der Waals forces and hydrogen bonding D. Electrostatic attractions between pairs of electrons and positively charged nuclei HL 1. How many σ and π bonds are present in a molecule of propyne, CH 3 CCH? σ π A. 5 3 B. 6 2 C. 7 1 D Which species does not contain delocalized electrons? A. CH 3 CH 2 O C. O 3 B. CH 3 CO 2 D. NO 3 3. How many sigma and pi bonds are there in propyne, CH 3 CCH? A. 2 sigma and 2 pi C. 6 sigma and 2 pi B. 7 sigma and 1 pi D. 5 sigma and 3 pi 4. Which species does not have delocalized electrons? A. NO 3 B. NO 2 C. O 3 D. C 3 H 6 7

8 5. In which compound are all the carbon atoms sp 2 hybridized? 6. In which substance does a carbon atom have sp 2 hybridization? A. 2-methylbutan-1-ol B. Propyne, CH 3 CCH C. C 60 fullerene D. Diamond 7. How many lone pairs and bonding pairs of electrons surround xenon in the XeF 4 molecule? Lone pairs Bonding pairs A. 4 8 B. 0 8 C. 0 4 D The Lewis structure of XeF 2 contains two bonding pairs of electrons and three non-bonding pairs of electrons (lone pairs) around the central xenon atom. What is the shape of XeF 2 molecule? A. Bent C. Square planar B. Trigonal bipyramidal D. Linear 9. How many sigma (σ) bonds are present in (CH 3 ) 2 C=CClCH 2 CH 3? A. 1 C. 16 B. 4 D. 17 8

9 D. sp sp 2 sp sp The graph below shows the first four ionization energies of four elements A, B, C and D (the letters are not their chemical symbols). Which element is magnesium? 11. Which molecule has an octahedral shape? A. SF 6 C. XeF 4 B. PCl 5 D. BF Which species have delocalized electrons? A. I and II only C. II and III only B. I and III only D. I, II and III 13. Identify the hybridization of carbon atoms in this molecule A. sp 3 sp 2 sp 2 sp 2 B. sp 2 sp 2 sp 2 sp C. sp 3 sp sp 2 sp

10 14. Which structure has delocalized π electrons? A. O 3 B. CO C. HCN D. CO How many bonding pairs and lone pairs of electrons surround the sulfur atom in the SF 4 molecule? Bonding pairs Lone pairs A. 4 1 B. 4 0 C. 6 0 D Which of the following best describes the formation of π bonds? A. They are formed by the sideways overlap of parallel orbitals. B. They are formed by the axial overlap of orbitals. C. They are formed by the sideways overlap of an s and p orbital. D. They are formed by the axial overlap of either s or p orbitals. 17. What is the type of hybridization of the silicon and oxygen atoms in silicon dioxide? Silicon Oxygen A. sp 3 sp 3 B. sp 3 sp 2 C. sp 2 sp 3 D. sp 2 sp How many sigma (σ) and pi (π) bonds are present in the structure of HCN? σ π A. 1 3 B. 2 3 C. 2 2 D

IB Topics 4 & 14 Multiple Choice Practice

IB Topics 4 & 14 Multiple Choice Practice 1. Which compound has the shortest C N bond? CH 3NH 2 (CH 3) 3CNH 2 CH 3CN CH 3CHNH 2. Which of the following series shows increasing hydrogen bonding with water?