Chapter 5 Practice Questions

4) Suppose that in an ionic compound, "M" represents a metal that could form more than one type of ion. In the formula MF2 , the charge of the M ion would be: A) +2 B) -1 C) +4 D) -2 E) +1

A) +2

63) What is the formula mass of copper(II) fluoride? A) 101.55 B) 146.10 C) 90.00 D) 165.10 E) none of the above

A) 101.55

6) How many O atoms are present in sodium chlorite? A) 2 B) 6 C) 4 D) 1 E) none of the above

A) 2

11) How many carbon atoms are in the formula Al2(CO3)3? A) 3 B) 9 C) 1 D) 6 E) none of the above

A) 3

44) The charge of a vanadium ion in the compound V2O5 is: A) 5+ B) 2+ C) 10+ D) 10- E) none of the above

A) 5+

60) What is the formula mass of sulfurous acid? A) 82.08 amu B) 98.08 amu C) 83.09 amu D) 66.08 amu E) none of the above

A) 82.08 amu

26) What is the formula for an ionic compound made of barium and nitrogen? A) Ba3N2 B) Ba2N3 C) BaN D) Ba2N4 E) none of the above

A) Ba3N2

45) What is the correct formula for the hypochlorite polyatomic ion? A) ClO B)ClO2- C) ClO3- D) ClO4- E) none of the above

A) ClO

29) The ionic compound that forms between potassium and oxygen is: A) K2O. B) KO. C) KO2. D) K2O2. E) none of the above

A) K2O.

4) The oxygen-to-hydrogen mass ratio of water is always 8.0 is an example of what fundamental law? A) Law of Constant Composition B) Law of Constant Mass Ratio C) Law of Conservation of Mass D) Law of Constant Whole Number Ratio E) none of the above

A) Law of Constant Composition

27) What is the formula for an ionic compound made of magnesium and sulfur? A) MgS B) MgS2 C) Mg2S D) Mg2S3 E) none of the above

A) MgS

16) How many of each type of atom are there in the formula (NH4)2HPO4? A) N = 2, H = 9, P = 1, O = 4 B) N = 1, H = 5, P = 1, O = 4 C) N = 2, H = 5, P = 1, O = 4 D) N = 2, H = 8, P = 1, O = 4 E) none of the above

A) N = 2, H = 9, P = 1, O = 4

42) What is the correct formula for ammonium hydrogen sulfate? A) NH4HSO4 B) (NH4)2HSO4 C) (NH4)2SO4 D) Am2HSO4 E) none of the above

A) NH4HSO4

17) What is the correct formula for a compound that has three oxygen atoms and one sulfur atom? A) O3S B) SO3 C) 3OS D) SO3 E) none of the above

B) SO3

9) Which of the following statements about chemical formulas is FALSE? A) The subscripts represent the relative number of each type of atom in the compound. B) The subscripts represent the relative mass of each type of atom in the compound. C) The subscripts do not change for a given compound. D) Different compounds made of the same elements have different subscripts. E) All of the statements are true.

B) The subscripts represent the relative mass of each type of atom in the compound.

36) What is the name of Ca(NO3)2? A) calcium dinitrite B) calcium nitrate C) calcium nitride D) calcium nitrite E) none of the above

B) calcium nitrate

56) What is the name of HI (aq)? A) hydroiodous acid B) hydroiodic acid C) iodic acid D) iodous acid E) none of the above

B) hydroiodic acid

22) Fluorine is considered which of the following? A) atomic element B) molecular element C) molecular compound D) ionic compound E) none of the above

B) molecular element

58) What is the name of HNO2? A) nitric acid B) nitrous acid C) hydronitrous acid D) hydronitric acid E) none of the above

B) nitrous acid

46) What is the correct name for the BrO4 1- ion? A) hypobromite B) perbromate C) bromite D) bromate E) none of the above

B) perbromate

1) When elements combine to form compounds: A) their properties are an average of all elements in the compound. B) their properties change completely. C) their properties do not change. D) their properties are completely random. E) none of the above

B) their properties change completely.

7) What is the formula mass of magnesium nitride? A) 38.32 B) 90.65 C) 100.95 D) 116.33 E) none of the above

C) 100.95

3) The law of constant composition states: A) Matter cannot be either created or destroyed in a chemical reaction. B) The nucleus is a dense region of positive charge that always contains protons and neutrons. C) All samples of a given compound have the same proportions of their constituent elements. D) All atoms of a given element have a constant composition and are different than atoms of any other element. E) none of the above

C) All samples of a given compound have the same proportions of their constituent elements.

40) What is the formula for the acetate polyatomic ion? A) C3H2O3- B) C2H3O22- C) C2H3O2- D) C2H3O E)none of the above

C) C2H3O2-

15) How many of each type of atom are there in the formula Ca3(PO4)2? A) Ca = 3, P = 1, O = 4 B) Ca = 3, P = 2, O = 4 C) Ca = 3, P = 2, O = 8 D) Ca = 3, P = 1, O = 8 E) none of the above

C) Ca = 3, P = 2, O = 8

59) A certain oxyacid is derived from the oxyanion SO32-. The formula for the oxyacid is: A) H2SO4. B) HSO3. C) H2SO3. D) H3SO3. E) none of the above

C) H2SO3.

43) The formula for potassium chlorate is KClO3. The formula for magnesium chloride is MgCl2. What is the formula for magnesium chlorate? A) MgClO3 B) Mg2ClO3 C) Mg(ClO3)2 D) Mg2(ClO3)3 E) none of the above

C) Mg(ClO3)2

6) The phosphorous-to-hydrogen mass ratio is 10.2 for a compound. This ratio could correspond to the compound: A) PH. B) PH2. C) PH3. D) PH6. E) none of the above

C) PH3.

32) What is the name of the ionic compound made of beryllium and chlorine? A) beryllium(II) chloride B) beryllium dichloride C) beryllium chloride D) monoberyllium dichloride E) none of the above

C) beryllium chloride

24) Which of the following species is a molecular element? A) neon B) sodium C) chlorine D) carbon dioxide E) none of the above

C) chlorine

55) What is the proper name for HBr (aq)? A) hydrobromous acid B) hydrousbromic acid C) hydrobromic acid D) bromous acid E) none of the above

C) hydrobromic acid

21) Carbon monoxide is considered which of the following? A) atomic element B) molecular element C) molecular compound D) ionic compound E) none of the above

C) molecular compound

66) A compound has a formula mass of 61.98 amu and is comprised of atoms of sodium and oxygen in a definite ratio. The name of the compound described here is: A) sodium monoxide. B) disodium oxide. C) sodium oxide. D) sodium dioxide. E) none of the above

C) sodium oxide.

50) What is the name of the molecular compound SO3? A) sulfur oxide B) sulfur(IV) oxide C) sulfur trioxide D) sulfur tetraoxide E) none of the above

C) sulfur trioxide

1) What is the mass ratio of Na to S in sodium sulfide? A) 7.17 B) 55.06 C) 0.717 D) 1.43 E) none of the above

D) 1.43

61) What is the formula mass for potassium nitrate? A) 92.99 amu B) 117.11 amu C) 85.11 amu D) 101.10 amu E) none of the above

D) 101.10 amu

10) How many total atoms are in the formula Al2(CO3)3? A) 8 B) 9 C) 12 D) 14 E) none of the above

D) 14

5) What is the oxygen-to-hydrogen mass ratio for H2O2? A) 0.125 B) 4 C) 8 D) 16 E) none of the above

D) 16

62) What is the formula mass for diboron tetrachloride? A) 127.98 amu B) 198.89 amu C) 234.34 amu D) 163.43 amu E) none of the above

D) 163.43 amu

8) Suppose an unknown compound XY has an X-to-Y mass ratio of 4.0. If decomposition of compound XY gives 12.0 grams of X, then how many grams of Y must form? A) 48.0 grams B) 12.0 grams C) 4.0 grams D) 3.0 grams E) none of the above

D) 3.0 grams

34) Which metal atom below cannot form a cation of several different charges? A) Cr B) Mn C) Fe D) Ba E) none of the above

D) Ba

13) Which formula shows the proper use of parentheses? A) Ca(F)2 B) Ca(SO4) C) (NH4)3(PO4) D) Ca(NO3)2 E) none of the above

D) Ca(NO3)2

41) What is the correct formula for potassium dichromate? A) K(CrO4)2 B) KCr2O7 C) K2CrO4 D) K2Cr2O7 E) none of the above

D) K2Cr2O7

14) How many of each type of atoms are there in the formula NH4C2H3O2? A) N = 4, H = 7, C = 2, O = 2 B) N = 1, H = 4, C = 2, O = 2 C) N = 1, H = 3, C = 2, O = 2 D) N = 1, H = 7, C = 2, O = 2 E) none of the above

D) N = 1, H = 7, C = 2, O = 2

18) What is the correct formula of a compound that has ten oxygen atoms and four phosphorus atoms? A) O10P4 B) 10OP4 C) 4PO10 D) P4O10 E) none of the above

D) P4O10

54) What is the correct formula for the molecular compound heptaphosphorus octafluoride? A) P5F8 B) P 7F6 C) P6F7 D) P7F8 E) none of the above

D) P7F8

2) The first chemist to formally state the law of constant composition was: A) Dalton. B) Mendeleev. C) Rutherford. D) Proust. E) none of the above

D) Proust.

51) What is correct name of the compound whose formula is N2O4? A) nitrogen dioxide B) nitrogen tetroxide C) dinitrogen oxide D) dinitrogen tetroxide E) none of the above

D) dinitrogen tetroxide

23) Ammonium fluoride is considered which of the following? A) atomic element B) molecular element C) molecular compound D) ionic compound E) none of the above

D) ionic compound

33) What is the name of the compound made from lithium and oxygen? A) lithium dioxide B) lithium(I) oxide C) oxygen lithide D) lithium oxide E) none of the above

D) lithium oxide

20) Which among the following elements does NOT exist as a diatomic molecule in nature? A) hydrogen B) nitrogen C) fluorine D) neon E) none of the above

D) neon

25) Which of the following is a molecular compound? A) barium sulfide B) calcium acetate C) potassium hydroxide D) nitrogen monoxide E) none of the above

D) nitrogen monoxide

39) What is the name of the compound whose formula is Na2O? A) sodium monoxide B) disodium oxide C) disodium monoxide D) sodium oxide E) none of the above

D) sodium oxide

49) What is the name of the molecular compound SF5? A) sulfur hexafluoride B) sulfur heptafluoride C) monosulfur tetrafluoride D) sulfur pentafluoride E) none of the above

D) sulfur pentafluoride

48) The name trisodium phosphate is incorrect for the compound Na3PO4 because: A) this compound should be called trisodium monophosphate. B) the sodium has a negative 3 charge. C) you cannot use a prefix for the first element in a molecular compound. D) you cannot use a prefix for the first element of an ionic compound. E) none of the above

D) you cannot use a prefix for the first element of an ionic compound.

3) Suppose that in an ionic compound, "M" represents a metal that could form more than one type of ion. In the formula MP , the charge of the M ion would be: A) +1 B) -1 C) +2 D) -3 E) +3

E) +3

28) What is the formula for an ionic compound made of carbon and oxygen? A) CO2 B) C2O C) CO D) CO3 E) Carbon and oxygen do not form an ionic compound.

E) Carbon and oxygen do not form an ionic compound.

65) Which of the following compounds have the smallest formula mass? A) CO2 B) SO2 C) NO2 D) SiO2 E) H2O

E) H2O

31) A student wrote the formula for the compound aluminum phosphate as AlPO4 . What is wrong with this formula? A) The compound is not charge-neutral. B) Aluminum is a nonmetal so it cannot form an ionic compound. C) The formula should be Al(PO4) . D) There cannot be three different atom types in a chemical formula. E) Nothing is wrong with the formula.

E) Nothing is wrong with the formula.

47) Choose the pair of names and formulas that do NOT match. A) copper(I) nitrate: CuNO3 B) copper(II) nitride: Cu3N2 C) copper(II) nitrate: Cu(NO3)2 D) copper(II) nitrite: Cu(NO2)2 E) all of these are correct

E) all of these are correct

38) Which formula shown is incorrect for the name given? A) strontium carbonate: SrCO3 B) ammonium cyanide: NH4CN C) potassium acetate: KC2H3O2 D) calcium nitrate: Ca(NO3)2 E) lithium sulfate: LiSO4

E) lithium sulfate: LiSO4

30) What is the formula for an ionic compound made of aluminum and oxygen? A) AlO2 B) Al2O3 C) Al3O2 D) AlO E) none of the above

B) Al2O3

53) What would the formula of diiodine pentasulfide be? A) I5S2 B) I2S5 C) I4S9 D) I2S7 E) none of the above

B) I2S5

64) Which of the following has the largest formula mass? A) CO2 B) SO2 C) NO2 D) SiO2 E) H2O

B) SO2

19) Carbon is considered which of the following? A) atomic element B) molecular element C) molecular compound D) ionic compound E) none of the above

A) atomic element

52) What is correct name of the compound whose formula is BF3? A) boron trifluoride B) boron fluoride C) monoboron trifluorine D) boron(III) fluoride E) none of the above

A) boron trifluoride

35) What is the name of CoS? A) cobalt(II) sulfide B) cobalt sulfide C) cobalt monosulfide D) cobaltous sulfur E) none of the above

A) cobalt(II) sulfide

57) What is the name of HIO3? A) iodic acid B) hydroioidic acid C) hydroiodous acid D) iodous acid E) none of the above

A) iodic acid

37) Which formula shown is incorrect for the name given? A) magnesium nitrite: Mg(NO2)3 B) calcium carbonate: CaCO3 C) aluminum sulfate: Al2(SO4)3 D) sodium hydrogen carbonate: NaHCO3 E) potassium hydroxide: KOH

A) magnesium nitrite: Mg(NO2)3

8) Oxyacids contains at least one H+ and an oxyanion. The " nitrous " oxyacid contains the oxyanion ________. A) nitrite B) nitrate C) nitride D) nitric E) none of the above

A) nitrite

7) What is the oxygen-to-sulfur mass ratio of sulfur dioxide? A) 0.5 B) 1.0 C) 2.0 D) 16 E) none of the above

B) 1.0

2) If the mass ratio of K to F in a compound is 2.06:1, how many grams of F are needed to react with 2.30 g of K? A) 0.877 B) 1.12 C) 0.112 D) 8.77 E) none of the above

B) 1.12

5) How many C atoms are in ammonium acetate? A) 5 B) 2 C) 1 D) 3 E) none of the above

B) 2

12) How many oxygen atoms are in the formula Al2(CO3)3? A) 3 B) 9 C) 1 D) 6 E) none of the above

B) 9