1 Which of the following expressions represents two
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1. Which of the following expressions represents two molecules of water? A. H 2 O B. H 2 O 2 C. 2 H 2 O * D. 2 HO 2 2. Which molecule from the following has the largest mass A. HBr B. HCl C. HF D. HI * 3. Which of these compounds is a binary compound? A. Na. Cl * B. Mg. SO 4 C. Na. OH D. HCN 4. Which of these compounds is a ternary compound? A. Na. Cl B. H 2 O C. Na. OH * D. Mg. Br 2 Chapter 2
5. A compound has the empirical formula HC and molecular mass 78. 11 g. The molecular formula could be written as: A. H 2 C 2 B. H 4 C. H 5 C 5 D. H 6 C 6 * 6. The formula of stannic oxide is Sn. O 2. The valence of Sn is: A. +1 B. +2 C. +3 D. +4 * 7. Atoms with the same number of electrons and number of protons are called… A. ions B. isotopes C. neutral atoms * D. different atoms 8. Al 3+ is an example of one of the following: A. amonatomic anion B. monatomic cation * C. a polyatomic cation D. a polyatomic anion Chapter 2
9. Which of the following molecule is a diatomic molecule ? A. N 2 O B. N 2 O 4 C. NO 2 D. NO * 10. One of the following molecule is not a polyatomic molecule: A. NH 3 B. CH 4 C. H 2 O D. HCl * 11. Atoms which have different number of electrons are called… A. ions * B. isotopes C. neutral atoms D. different atoms 12. SO 42+ is an example of one of the following: A. amonatomic anion B. monatomic cation C. a polyatomic cation D. a polyatomic anion* Chapter 2
13. Which of the following expressions represents three moles of amonia? A. NH 3 B. NH 4+ C. 3 NH 3 * D. N 3 H 6 14. The Stock system name for FCl 3 A. Iron (II) chloride B. Iron (III) trichloride C. Iron (III) chloride * D. monoiron trichloride 15. Which of these ions is a monoatomic ions ? A. Na+ * B. SO 42 C. NO 3 D. NH 4+ 16. Which of these compounds is a ternary compound? A. Na. Cl B. H 2 O C. Na. OH * D. Mg. Br 2 Chapter 2
17. Which of the following expressions represents two molecules of water? A. H 2 O B. H 2 O 2 C. 2 H 2 O * D. 2 HO 2 18. A compound has the empirical formula HC and molecular mass 78. 11 g. The molecular formula could be written as: A. H 2 C 2 B. H 4 C. H 5 C 5 D. H 6 C 6 * 19. Which of these compounds is a binary compound? A. Na. Cl * B. Mg. SO 4 C. Na. OH D. HCN 20. Which of these compounds is a ternary compound? A. Na. Cl B. H 2 O C. Na. OH * D. Mg. Br 2 Chapter 2
21. An anion is defined as A. a charged atom or group of atoms with a net negative charge. * B. a stable atom. C. a group of stable atoms. D. an atom or group of atoms with a net positive charge. 22. An cation is defined as … A. a charged atom or group of atoms with a net negative charge. B. a stable atom. C. a group of stable atoms. D. an atom or group of atoms with a net positive charge. * 23. Atoms of the same element with different mass numbers (or number of neutrones) are called … A. ions. B. neutrons. C. allotropes. D. chemical families. E. isotopes * 24. How many neutrons are there in an atom of lead A. 82 B. 126 * C. 208 D. 290 82 Pb whose mass number is 208? Chapter 2
25. molecules consist of the same element with different numbers of atoms and chemical structure are called … A. ions. B. neutrons. C. allotropes * D. isotopes. 26. A magnesium ion, 12 Mg 2+, has A. 12 protons and 13 electrons. B. 24 protons and 26 electrons. C. 12 protons and 10 electrons. * D. 24 protons and 22 electrons. E. 12 protons and 14 electrons. 27. A sulfide ion, 16 S 2 - , has: A. 16 protons and 16 electrons B. 32 protons and 16 electrons C. 16 protons and 14 electrons D. 16 protons and 18 electrons * E. 32 protons and 18 electrons Chapter 2
28. Which of these elements is most likely to be a good conductor of electricity? A. N B. S C. He D. Cl E. Fe * 29. Which of these pairs of elements would be most likely to form an ionic compound? A. P and Br B. Cu and K C. C and O D. O and Zn * E. Al and Rb 30. Which of these pairs of elements would be most likely to form a molecular compound? A. Na and Br B. Ca and O C. C and O * D. Zn and O E. Mg and Cl 31. What is the formula for the ionic compound formed by calcium ions and nitrate ions? A. Ca 3 N 2 B. Ca(NO 3)2 * C. Ca 2 NO 3 D. Ca 2 NO 2 Chapter 2 E. Ca. NO 3
32. Which is the correct formula for copper(II) phosphate? A. Cu 2 PO 4 B. Cu 3(PO 4)2 * C. Cu 2 PO 3 D. Cu(PO 4)2 E. Cu(PO 3)2 33. The correct name for NH 4 NO 3 is A. ammonium nitrate. * B. ammonium nitrogen trioxide. C. ammonia nitrogen oxide. D. hydrogen nitrogen oxide. E. hydrogen nitrate. 34. The correct name for PCl 5 is A. monophosphate pentachloride B. phosphorus chloride C. chlorophosphate D. monophosphate tetrachloride E. phosphorus pentachloride * Chapter 2
35. Use the following table and choose which of the species are neutral? Atom or ion element I II IV V VI Atom or ion electrons (e) 6 10 18 10 28 7 Atom or ion protons (p) 6 8 17 11 30 7 Atom or ion neutrons (n) 6 8 18 11 36 6 A. III and V B. IV and V C. II and III D. I and VI * 36. Use the following table and choose which of the species are negatively charged? Atom or ion element I II IV V VI Atom or ion electrons (e) 6 10 18 10 28 7 Atom or ion protons (p) 6 8 17 11 30 7 Atom or ion neutrons (n) 6 8 18 11 36 6 A. III and V B. IV and V C. II and III * D. I and VI Chapter 2
37. Use the following table and choose which of the species are positively charged? Atom or ion element I II IV V VI Atom or ion electrons (e) 6 10 18 10 28 7 Atom or ion protons (p) 6 8 17 11 30 7 Atom or ion neutrons (n) 6 8 18 11 36 6 A. III and V B. IV and V * C. II and III D. I and VI 38. An atom of the isotope 16 S-31 consists of how many protons, neutrons, and electrons? (p = proton, n = neutron, e = electron) A. 15 p, 16 n, 15 e B. 16 p, 15 n, 16 e * C. 16 p, 31 n, 16 e D. 32 p, 31 n, 32 e E. 16 p, 16 n, 15 e Chapter 2
39. Which is the formula for the dinitrogen pentoxide A. NO 2 B. N 2 O 5 * C. N 2 O 7 D. N 2 O 2 40. The name for the group of those elements (F, Cl, Br, I) is: A. Halogen group * B. Nobel gase C. Alkaline group D. Transition metal group 41. Chromium (24 Cr ) element is : A. A metal B. found in groups B C. found in period 4 D. all the above * Chapter 2
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