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

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.

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

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

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

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

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

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

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

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

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?

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

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