Unit+5+-+Ionic+Bonds

1) Which of the following ions occurs commonly? A. N3+ B. S6+ ** C. O2-     **  It is gaining the correct amount of electrons (periodic table) D. Ca+ E. Cl+ 2) Which of the following ions occurs commonly? A. P3+ B. Br7+ C. O6+ E. K-
 *  D. Ca2+  ** It is losing the correct amount of ions (periodic table)

3) The colorless substance, MgF2, is used in the ceramics and glass industry. What is its name? A. magnesium difluoride  **B. magnesium fluoride**  C. magnesium(II) fluoride not the answer D. monomagnesium difluoride E. none of these choices is correct, since they are all misspelled

4) The compound, BaO, absorbs water and carbon dioxide readily and is used to dry gases and organic solvents. What is its name?  **A. barium oxide** B. barium(II) oxide C. barium monoxide D. baric oxide E. barium peroxide

5) What is the name of Na2O? A. disodium monoxide B. sodium monoxide <span style="color: rgb(8, 212, 38)"> C. sodium dioxide D. sodium(I) oxide <span style="color: rgb(7, 242, 10)"> **E. sodium oxide** correct answer

6) The substance, CaSe, is used in materials which are electron emitters. What is its name? A. calcium monoselenide B. calcium(II) selenide <span style="color: rgb(8, 186, 43)"> **C. calcium selenide** D. calcium(I) selenide E. calcium(II) selenium

7) Which one of the following combinations of names and formulas of ions is incorrect? A. O2- oxide <span style="color: rgb(10, 205, 46)"> **B. Al3+ aluminum** it is a positive 2 C. NO3- nitrate D. PO43- phosphate E. CrO42- chromate

8) Which one of the following combinations of names and formulas of ions is incorrect? A. O2- oxide B. Cd2+ cadmium C. ClO3- chlorate D. HCO3- hydrogen carbonate <span style="color: rgb(5, 235, 43)"> **E. NO2- nitrate** this is nitrite

9) Which one of the following combinations of names and formulas of ions is incorrect? A. Ba2+ barium <span style="color: rgb(5, 230, 39)"> **B. S2- sulfate** this should be SO4-2 C. CN- cyanide D. ClO4- perchlorate E. HCO3- bicarbonate

10) Which one of the following combinations of names and formulas of ions is incorrect? A. NH4+ ammonium B. S2- sulfide C. CN- cyanide D. S2O32- thiosulfate <span style="color: rgb(0, 255, 21)"> **E. ClO3- perchlorate** it should be ClO4-

11) Zinc acetate is used in preserving wood and in manufacturing glazes for porcelain. What is its formula? A. ZnAc2 B. ZnCH3COO <span style="color: rgb(6, 219, 22)"> **C. Zn(CH3COO)2** D. Zn2CH3COO E. ZnCH3COCH3

12) Silver chloride is used in photographic emulsions. What is its formula? A. Ag2Cl3 B. Ag2Cl C. AgCl3 D. AgCl2
 * <span style="color: rgb(6, 229, 35)"> E. AgCl ** The are both ones

13) Barium sulfate is used in manufacturing photographic paper. What is its formula? <span style="color: rgb(9, 200, 19)"> **A. BaSO4** correct answer B. Ba(SO4)2 <span style="color: rgb(10, 0, 0)">**<span style="color: rgb(9, 225, 33)"> C. Ba2SO4 ** D. Ba2(SO4)3 E. BaSO3

14) Sodium peroxide is an oxidizer used to bleach animal and vegetable fibers. What is its formula? A. NaO B. NaO2 <span style="color: rgb(8, 231, 12)"> **C. Na2O2** correct answer <span style="color: rgb(8, 221, 33)"> D. Na2O E. NaH2O2

15) What is the formula for magnesium sulfide? <span style="color: rgb(6, 234, 35)"> **A. MgS** B. MgS2 C. Mg2S D. Mg2S3 E. MgSO4

16) Kaolinite, a clay mineral with the formula Al4Si4O10(OH)8, is used as a filler in slick-paper for magazines and as a raw material for ceramics. Analysis shows that 14.35 g of kaolinite contains 8.009 g of oxygen. Calculate the mass percent of oxygen in kaolinite. <span style="color: rgb(7, 218, 18)"> A. 1.792 mass % B. 24.80 mass % C. 30.81 mass % D. 34.12 mass % <span style="color: rgb(7, 233, 26)"> **E. 55.81 mass %** 14.35/8.009g of O

17) Lithium forms compounds which are used in dry cells and storage batteries and in high-temperature lubricants. It has two naturally occurring isotopes, 6Li (isotopic mass = 6.015121 amu) and 7Li (isotopic mass = 7.016003 amu). Lithium has an atomic mass of 6.9409 amu. What is the percent abundance of lithium-6? A. 92.50% B. 86.66% C. 46.16% <span style="color: rgb(9, 215, 14)"> **D. 6.95%** 6.9409 = Cx6.015121+100-Cx7.016003 E. 6.080%

18) Ammonium sulfate, (NH4)2SO4, is a fertilizer widely used as a source of nitrogen. Calculate its molecular mass. A. 63.07 amu B. 114.l0 amu C. 118.13 amu D. 128.11 amu <span style="color: rgb(9, 246, 44)"> **E. 132.13 amu** Off the periodic table

19) Sodium chromate is used to protect iron from corrosion and rusting. Determine its molecular mass. A. 261.97 amu B. 238.98 amu <span style="color: rgb(8, 231, 18)"> **C. 161.97 amu** Na2CrO4 D. 138.98 amu E. 74.99 amu

20) Calculate the molar mass of Ca(BO2)2·6H2O. A. 273.87 g/mol C. 183.79 g/mol D. 174.89 g/mol E. 143.71 g/mol
 * <span style="color: rgb(11, 234, 83)"> B. 233.79 g/mol ** Use the periodic table

21) Magnesium fluoride is used in the ceramics and glass industry. What is the mass of 1.72 mol of magnesium fluoride? A. 43.3 g B. 62.3 g <span style="color: rgb(21, 198, 26)"> C. 74.5 g D. 92.9 g <span style="color: rgb(9, 215, 18)"> **E. 107 g** Find grams of Magnesium flouride off of the periodic table. Then use stioch to find the moles.

22) Aluminum oxide, Al2O3, is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators. Calculate the number of moles in 47.51 g of Al2O3. A. 2.377 mol B. 2.146 mol C. 1.105 mol E. 0.4207 mol
 * <span style="color: rgb(10, 178, 24)"> D. 0.4660 mol ** Find the grams of Al2O3, then use stoich.

23) Calculate the number of oxygen atoms in 29.34 g of sodium sulfate, Na2SO4. <span style="color: rgb(4, 246, 18)"> **A. 1.244 × 1023 O atoms** B. 4.976 × 1023 O atoms C. 2.409 × 1024 O atoms D. 2.915 × 1024 O atoms E. 1.166 × 1025 O atoms

24) Household sugar, sucrose, has the molecular formula C12H22O11. What is the % of carbon in sucrose, by mass? A. 26.7 % B. 33.3 % C. 41.4 % E. 52.8 %
 * <span style="color: rgb(24, 224, 11)"> D. 42.1 % ** Find the mass of the total (periodic table) and divide it into the mass of C12. That will give you the percent.

25) Hydroxylamine nitrate contains 29.17 mass % N, 4.20 mass % H, and 66.63 mass % O. Determine its empirical formula. A. HNO C. HN6O16 D. HN16O7 E. H2NO3
 * <span style="color: rgb(8, 217, 40)"> B. H2NO2 ** Grams to Moles. Find the ratios.

26) Alkanes are compounds of carbon and hydrogen with the general formula CnH2n+2. An alkane component of gasoline has a molar mass of between 125 and 130 g/mol. What is the value of n for this alkane? A. 4 C. 10 D. 13 E. 14
 * <span style="color: rgb(10, 228, 1)"> B. 9 ** Guess and Check