Practice Examination #6 A. H :..

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1 Practice Examination #6 Name: Date:. Which kind of bond is formed when two atoms share electrons to form a molecule? A. ionic B. metallic C. electrovalent D. covalent 2. The distance between two adjacent nuclei of an element in the solid phase is 2.4 Å. The covalent atomic radius of an atom of this element is closest to A..5 Å B..2 Å C. 2.4 Å D. 4.8 Å 3. According to Reference Table E, which compound forms spontaneously from its elements? 5. Which molecule can form a coordinate covalent A. :.Ṇ: C. : C: B. : D. : C:: C: 6. The four single bonds of a carbon atom are directed in space toward the corners of a A. regular tetrahedron B. regular octahedron C. square plane D. trigonal bipyramid 7. An example of a network solid is TABLE OF SOLUBILITIES IN WATER i nearly insoluable ss slightly soluable s soluable d decomposes n not isolated acetate bromide carbonate chloride chromate hydroxide iodide nitrate phosphate sulfate Aluminum ss s n s n i s s i s d Ammonium s s s s s s s s s s s Barium s s i s i s s s i i d Calcium s s i s s ss s s i ss d Copper II s s i s i i n s i s i Iron II s s i s n i s s i s i Iron III s s n s i i n s i ss d Lead s ss i ss i i ss s i i i Magnesium s s i s s i s s i s d Mercury I ss i i i ss n i s i ss i Mercury II s ss i s ss i i s i d i Potassium s s s s s s s s s s s Silver ss i i i ss n i s i ss i Sodium s s s s s s s s s s s Zinc s s i s s i s s i s i sulfide A. magnesium oxide B. lithium oxide C. carbon dioxide D. silicon dioxide 8. A chemical bond results when two nuclei have a simultaneous attraction for 9. A. nucleons B. protons C. neutrons D. electrons :.Ọ: :.Ọ: What kind of bond is formed in the reaction shown? A. C 2 4 B. C 2 2 C. NO 2 D. CO 2 4. Which compound contains both covalent and ionic bonds? A. KCl B. N 4 Cl A. metallic bond B. hydrogen bond C. network bond D. coordinate covalent bond C. MgCl 2 D. CCl 4 page

2 . When phosphorus and chlorine atoms combine to form a molecule of PCl 3, 6 electrons will be 5. A double carbon-carbon bond is found in a molecule of A. shared equally B. shared unequally C. lost D. gained A. pentane B. pentene C. pentyne D. pentanol. Given the reaction: Proton. : N / Ammonia. :N / Ammonium Ion Which type of bond is formed between the proton ( ) and the ammonia molecule? A. ionic B. network C. coordinate covalent D. nonpolar covalent 6. A molecule of a compound contains a total of hydrogen atoms and has the general formula Cn 2n2. Which prefix is used in the name of this compound? A. but- B. dec- C. oct- D. pent- 7. Which molecule is a dipole? A. e B. 2 C. N 3 D. C 4 8. The P Cl bond in a molecule of PCl 3 is 2. Which pair of atoms is held together by a covalent A. Cl B. LiCl C. NaCl D. KCl 3. Which formulas represent one ionic compound and one molecular compound? A. N 2 and SO 2 B. Cl 2 and 2 S C. BaCl 2 and N 2 O 4 D. NaO and BaSO 4 A. nonpolar covalent B. polar covalent C. coordinate covalent D. electrocovalent 9. Which molecule contains a nonpolar covalent A. ẋ.ṇ x. B. ẋcl: C. ẋọ: D. ẋ 4. Given the structural formula: 2. The bonding in N 3 is most similar to the bonding in A. 2 O B. NaCl C. MgO D. KF This compound is classified as an A. amide B. amine C. aldehyde D. alcohol 2. Which is the predominate type of attraction between molecules of F in the liquid state? A. hydrogen bonding B. electrocovalent bonding C. ionic bonding D. covalent bonding page 2 Practice Examination #6

3 22. ydrogen bonds are strongest between the molecules of 27. Which metal must be combined with chromium to produce stainless steel? A. F(l) B. Cl(l) C. Br(l) D. I(l) A. radium B. iron C. copper D. zinc 23. The strongest hydrogen bonds are formed between molecules in which hydrogen is covalently bonded to an element with A. high electronegativity and large atomic radius B. high electronegativity and small atomic radius C. low electronegativity and large atomic radius D. low electronegativity and small atomic radius 24. The relatively high boiling point of water is primarily due to the presence of A. hydrogen bonds B. van der Waals forces C. molecule-ion attractions D. ion-ion attractions 25. Which attractions are most prevalent between molecules of F in the liquid phase? A. van der Waals forces B. hydrogen bonds C. molecule-ion attractions D. ion-ion attractions 26. Oxygen, nitrogen, and fluorine bond with hydrogen to form molecules. Theses molecules are attracted to each other by A. ionic bonds B. hydrogen bonds C. electrovalent bonds 28. Mobile electrons are a distinguishing characteristic of A. an ionic bond B. an electrovalent bond C. a metallic bond D. a covalent bond 29. Which substance contains particles held together by metallic bonds? A. Ni(s) B. Ne(s) C. N 2 (s) D. L 2 (s) 3. When combining with nonmetallic atoms, metallic atoms generally will A. lose electrons and form negative ions B. lose electrons and form positive ions C. gain electrons and form negative ions D. gain electrons and form positive ions 3. Which element has a crystalline lattice composed of positive ions through which electrons flow freely? A. bromine B. calcium C. carbon D. sulfur 32. Which is the weakest Brönsted acid? A. N 4 B. SO 4 C. 2 SO 4 D. NO 3 D. coordinate covalent bonds page 3 Practice Examination #6

4 33. In the reaction 2 S N 3 N 4 S, the two Brönsted bases are 37. According to the Brönsted-Lowry theory, an acid is A. N 3 and N 4 B. N 3 and S C. 2 S and N 3 D. 2 S and S A. a proton donor B. a proton acceptor C. an electron donor 34. SYMBOLS USED IN NUCLEAR CEMISTRY alpha particle 4 2 e α beta particle (electron) gamma radiation e β neutron n n proton p deuteron 2 triton 3 positron e β According to Reference Table J, which species is amphoteric? A. 2 SO 4 B. SO 4 C. NO 2 D. NO Which of the following Brönsted acids has the strongest conjugate base? A. Br B. 2 SO 4 C. F D. 2 S 36. In the reaction N 2 2 O N 3 O, two Brönsted acids are A. N 2 and 2 O B. N 2 and N 3 C. 2 O and N 3 D. 2 O and O γ 38. D. an electron acceptor RELATIVE STRENGTS OF ACIDS IN AQUEOUS SOLUTION AT atm AND 298 K Conjugate Pairs ACID BASE K a I = I very large Br = Br very large Cl = Cl very large NO 3 = NO 3 very large 2 SO 4 = SO 4 large 2 O SO 2 = SO SO 4 = SO PO 4 = 2 PO Fe( 2 O) 3 6 = Fe( 2 O) 5 (O) NO 2 = NO F = F Cr( 2 O) 3 6 = Cr( 2 O) 5 (O) 2. 4 C 3 COO = C 3 COO.8 5 Al( 2 O) 3 6 = Al( 2 O) 5 (O) O CO 2 = CO SO 3 = SO S = S PO 4 = PO N 4 = N CO 3 = CO PO 2 4 = PO S = S O = O. 4 O = O 2 < 36 N 3 = N 2 very small Note: (aq) = 3 O Sample equation: I 2 O = 3 O I According to Reference Table L, which substance is amphiprotic? A. I B. N 4 C. NO 3 D. S page 4 Practice Examination #6

5 39. Which ion is the conjugate base of 2 SO 4? A. SO 3 2 B. S 2 C. SO 3 D. SO 4 4. According to the Arrhenius theory, when an acid substance is dissolved in water it will produce a solution containing only one kind of positive ion. To which ion does the theory refer? A. acetate B. hydrogen C. chloride D. sodium 4. According to the Arrhenius theory, the only negative ions in an aqueous solution of a base are A. O ions B. S ions C. ions D. CO 3 ions 42. Which species could act as either a Brönsted-Lowry acid or a Brönsted-Lowry base? A. N 4 B. CO 3 2 C. 2 PO 4 D. O Which substance can be classified as an Arrhenius acid? A. KF B. F C. KO D. Li page 5 Practice Examination #6