CHAPTER 5

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

...2) 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

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

4) 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

5) 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

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

7) 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

...8) 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

9) 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

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

...11) 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

12) 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

...13) 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

14) 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

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

16) 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.

17) 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

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

19) 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

20) 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

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

22) 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

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

24) 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

25) 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

26) 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

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

28) 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

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

...30) 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

31) 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

32) 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

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

34) 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

35) 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

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

37) 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