Homework 1 4 - Chem 1215 Fall 2011 Home Work#1(Chapter I and 2 7 Due Sept 29 EGEE E Name Section 1 To me this class will be a very easy 4 b fine c

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Unformatted text preview: Chem 1215 - Fall 2011 Home Work #1 (Chapter I and 2) 7 Due: Sept. 29 EGEE E Name - Section: 1. To me, this class will be a) very easy 4 b) fine c) very hard d) extremely hard ( Reasons are: 64?? 7 ~" E’tzaiséé‘fié (Chapter 2) 2. (ch2#8) Rewrite each of the following as an “ordinary” decimal number 4.172x10‘3 aware; 3.86 x 102 $9 2.19x105 2’93‘99 6.244 x 10'1 v. rarer” 3. (13/14) Write each of the following numbers in Standard scientific notation ,i! 1/2508 6 .9187 549'“: 102/105 W ‘ 4.54 xlO'1/251 A 818!» “‘3 762/104 14,. 0 8 850 "’" 4. (28) (i) Which metric system unit is most appropriate for measuring the distance between the 1/. :7 posts of a football field? @ eters b) millimeters c) centimeters (1) kilometers (ii) Which metric system unit is most appropriate for measuring the circumference of a I soccer ball? a) meters b) millimeters @centimeters d) kilometers 5. (33) Indicate the number of significant figures in each of the following a) 180 2 b) 180.0 ‘1 c) 1.80 x104 3 d) 180. :5 6. (52) Evaluate each of the following and write the answer to the appropriate number of significant figures. a) 2.0944 + 44.15 = 9197’ c) (1.42x102+ 1.7521 —7.99618) = 46/th 7.01 3.1x10'1 1 _ 21/ 0 .g , b) 8.128 + 55.8 = big w d) 57.1 x 9.11 = 725/ (5.2 x102 -2.8 x101) 7.180 7. (61/62) Perform each of the following conversions, being sure to set up the appropriate conversion factors in each case. [ the inside cover of the book provides equivalent statements] «I: a». m. 6.25 gal to pints : ! x" y“ i 4.1"- 4.62 feet to centimeters: 53 5V 1 i m f} M $ M ~ wwwmw’" if ("m "Ir 6?“ 4’ f 5 sf «f: 5 i n mam. / 0-3 8. (75). Convert the following Celsius temperature to Fahrenheit degrees (show work) Average temperature of Venus 460 0C: ’F' : (fiw‘flfif r 52, a. ' The “cloud” temperature of Jupiter -l45°C: l "C t "1 3’ 25> ‘ “gnu-v 9. (85) Referring to table 2.8, which substance listed is most dense? figflgflt Which substance listed is least dense? F r the two substances that you identified, for which one would a 1.000 g sample occupy the § ger volume? 0K ya 10. (105) Suppose that your car is rated at 43 mi/ gal for highway use. If you wanted to write to a friend in Spain about your car’s mileage, what ratings in kilometer per liter would you report? [ show work] 1” ; ‘1 g?" ; lam Edwina [M W/éxw 34 it i/ . r M“ f M” Y fl W7 A] {in ,flfcgm “"39” 42!?” {L l 3A3 I'm: 32%» @776] Chem 1215 - Fall 2011 Home Work #2 Due: Sept. 12, 201 1 Name EMF/A 25%» I Section: (Chapter 3) l. (13 ) Label each of the following as an atomic element, molecular element or a compound. T he letters correspond to the models shown on page 68 of your text \ a) g) e346 e? c) mines?” f) ewfwmfi 2. (17/18/49) Classify the following as physical or chemical change or property Concentrated hydrochloric acid has a choking pungent odor Copper compounds often form beautiful blue crystals when a a solution of a given copper compound is evaporated slowly Bread turns brown when you heat it in a toaster Nail polish remover will evaporate quickly @ person is asphyxiated by breathing carbon monoxide 0 3. (29/30) Classify the following as a ‘mixture’ or as a ‘pure’ substance. Big Mac from McDonalds V‘er Tossed salad from Wendy’s ’2’“? ‘4“ Distilled water / . O % Window glass 4. Classify the following mixtures as ‘heterogeneous’ or as a ‘homogeneous’ substance. Salsa White Wine Egg w a? wmxg C/team of tomato soup 0 ‘ firewed hot coffee a) A gaseous compound b) a mixture of two elements compound : ’1 0 ~ a solid compound ‘ H d) a mixture of gaseous element and a gaseous ¢ (Chapter 4) 6. Knowing only the mass number of an atom of an unidentified element enables you to determine which of the following? (a) the number of neutrons in the atom (b) the number of protons in the atom (c) two of the above — if so which ones? \ I the name of the element y (e he number of protons and neutrons in the atom 7. How is an ion formed? a) by either adding or subtracting protons from the atom b? by either adding or subtracting neutrons from the atom y either adding or subtracting electrons from the atom ) all of the above wo of the above 8. (19/20) Based on the following word descriptions, write the formula for each of the indicated substances An aluminum compound in which there are three oxygen atoms for two aluminum atoms 7471‘ fig? A compound whose molecules each contain two nitrogen atoms and five oxygen atoms Mir 05‘“ A compound in which there are two potassium atoms and an equal number of carbon atoms but 0 - two times as many oxygen atoms as atoms of potassium. €00 9. (35) For each of the following elements, use the periodic table on the inside cover of this book to write the element’s atomic number, symbol or name Atomic number Symbol Name gs The isotope of vanadium with 28 neutrons figv 74 Atomic number 32 and mass number 74 ,3; “‘5; Number of protons I 14, number of neutrons = 16 1‘! Chem 1215 - Fall20ll Home Work #3 Due: Sept 39, 201 l Section: 608’ (CHAPTER. 4 ) l. (42) Complete the following table. Atomic Mass number of Name Symbol number number Neutrons _ by“ 115In [55” fiL—W 49 . . ‘% 2* Zirconium er iii”? if: :9 50 2. (51) Write the number and name (if any) of the group (family) to which each of the following elements belongs. Group number Radium 23% Se Arsenic 5 {it c1 “7’4” 3. (57) The noble gas present in relatively large concentration in the atmosphere is m (— O 5 (65) An isolated atom has a net charge W 4. (73) How many electrons are present in each of the following ions? K+ it? N3' 5 0 Z Br' 3{9 Mn5+ 3’0 5. An ionic compound is composed of two fluoride ions and one cation. Which of the following could be the other ion? g2+ b) No; c) Mn4+ d) K+ e) Cl‘ An ionic compound is composed of three calcium ions and two anions. Which of the following could be the anion? [ a) K+ b) 02' C) so? 43' e) F' (CHAPTER 5 ) 6. (3) Cations are 5‘"; - and anions are 1’ w ions. j_____ — L (7) In naming ionic compounds, we always name the M :v» a R last. 7. (1 1/ 12) Identify each case in which the name is incorrect. Give the correct name for the indicated formula. m Crl3, chromium tr/flxlide I Cu 804, copper @wlfate 3 K20, potassium (Pfoxide 7 (13/15/17) Name each of the following binary compounds, K. SnCl4 fix/i i ”‘ BTF3 i; O < HgCIz 8. (41/42/43) Write the formula for each of the following binary ionic compounds P283 if :-' i i ’ 7P3! Cobalt (II) chloride Ca U z Manganese (IV) oxide ’Vi g \ Dinitrogen trioxide Na 0 3 Nitric acid 3:515" z 9 (57/59) Name each of the following compounds, which contain polyatomic ions (some of them are acids) H2303 Fe2(CO3)3 HI (EL/6.4.49. 0 :341—132 be} " .4 ; .—. 5%,}: i 12 AgZSO4 :39 r. ' 10. (43/45/47/49) Write the formula for each of the following substances. Chlor acrd HI 5 i L Barium acetate ‘5 " O (fidrocyanic acid C N “ Cobalt (III) perchlorate EM“ Chem 1215 - Fall2011 Home Work #4 : 0ct. 10, 201 l I S; . . A . "i Name @{fi fig 3A. ‘ ""9; L 6\l Section: CHAPTER. 5 l. (65) Complete the table below by writing the formulas and names for the ionic compounds formed when the cations listed across the top combine with the anions shown on the left— hand column. Hg2+ anion formula name ET: 3’ ,2 ’ r; a): E ail-Ml a)” J ,K» bfby‘fip. zf 3,, _ I”. ,A . $032 3 ( 2.; a a: 7314“. ‘l' - .r " K __U___r_ i. 2. (81/83...) Name each of the following compounds » 1'1.“ t-“ "g .'. FeBrz XeFé 9,“ i - 4 9 w mu m 4. wt Cu(MnO4)2 C0253 CHAPTER. 6 l 3. (17) If electricity of sufficient voltage is passed into a solution of potassium iodide in water, a reaction takes place in which elemental hydrogen gas and elemental iodine are produced, leaving a solution of potassium hydroxide. Write the unbalanced equation for this process. km: (41) Li (ii) W EL}, :1. i’" {.313}? l 4. (31) If a bottle of calcium oxide is left on the shelf too long, it gradually absorbs moisture from the humidity in the laboratory. Eventually the bottle cracks and spills the calcium hydroxide that has been produced. Write the balanced chemical equation for this process. C. O 1.2.3 -....~»;~ case‘s L 5. (39/40) Balance each of the following chemical equations Mno2 (s) + C (s) _—-+ Mn (5) + C02 (2;) Br2(g) + leO (1) + 302 (g) ——’ ZHBI (aq) + H2304 (31(1) N203 (g) + H20 (1) ——’ iHNoz (301) ZBaOQ (s) + ZHZO (l) ~——-> ZBa(OH)2 (aq) + 02 (g) 6. (45) Acetylene gas, Csz is used in welding because it generates an extremely high flame when combusted with oxygen. Carbon dioxide and water vapor are the chemical products of this reaction Write the balanced chemical equation for this process. / i i r ‘- - a. m a”: g on \x Z it: at t}: t 5}!va 4. «:- 26:- .61.} 2 , i; . ,5, . '3 , I .5 . 7. (73/75) Balance the following chemical equations 2c:sz (g) + 702 (g) —> eiCOz (g) + 3H20(g) CaCz (s) + ZHZO (1) ——> Ca(OH)2 (s) + €sz (g) ZNO (g) + C12 (g) —> 1NOC1 (a) can £127 8. (13) On the basis of the general solubility rules given in Table 7.1, for each of the following compounds, explain why the compound would be expected to be appreciably soluble in water. Indicate which of the solubility rules covers each substances particular situation. Barium nitrate Calcium sulfide Potassium chromate 9. (15) On the basis of the general solubility rules given in Table 7.1, predict the identity of the precipitate that forms when aqueous solutions of the following substances are mixed. If no precipitate is likely indicate which rules apply. Sodium sulfide, NaZS, and copper (H) nitrate, Cu(N03)2 N323 (aq) + Cu<N03>2 (aq) —> M ‘1' at ‘4’ 3 is) Ammonium chloride, NH4C1, and mercury (11) nitrate, Hg(N03)2 NH4C1 (aq) + Hg(N03)2 (aq) —> NaZSO4 (aq) + 10. (21) For each of the following precipitation reactions, complete and balance the equation, indicating clearly which product is the precipitate. ngmwaq) + Mnci2 (aq) _, its g 02an (aq) + (NH4)2CO3 91(1)” ’w‘iiwafi” i" U”: 542.ch I it) {t : ...
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This note was uploaded on 01/08/2012 for the course CHEM 1215 taught by Professor Staff during the Fall '08 term at Oklahoma State.

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Homework 1 4 - Chem 1215 Fall 2011 Home Work#1(Chapter I and 2 7 Due Sept 29 EGEE E Name Section 1 To me this class will be a very easy 4 b fine c

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