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psc102 s00 exam1

# psc102 s00 exam1 - Z SC 102 Exam 1(100 pts...

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Unformatted text preview: / Z /' . SC 102 Exam 1 (100 pts) Winn?" "nmu PM Name Part I - Multiple Choice (3 pts ea, Scantron) I Consider the following for questions 1-5: 1 A sealed thermometer contains 0.90 mLs of I mercury, a shiney liquid metal which has a density i at room temperature (25°) of 13.6 g/cm3. 1. How many grams of mercury are in Mm 151?. W 1.35 7 0,0 3%.? o '2 the thermometer? :1 "-6 at; a) 1.2 b) 1.1 : [we] . c) 15 d) 12 M: g e) 6.6 x 10-2 _‘ 2. When the thermometer is placed ’ ‘ "m Spud umxbscted'y. eom‘“ . inside a cooler room, where the C \ (l; r v so » .r 1? rim. home early for lunch. ' temp is 5°C, ‘ ‘ /d)' The density of the mercury decreases since its volume decreases and its mass stays unchanged. b) The density of the mercury increases since its volume decreases and its mass decreases. c) The density of the mercury decreases since its volume increases and its mass stays the same. d) The density of the mercury stays the same since both its volume and mass stay the same. L no C we) The density of the mercury increases sinceits volume decreases and its mass stays the same. M tar-L. C 7. . Determine the volume of mercury inside the thermometer in ounces. a) 27 b) 3.4x 102 c) 0.4 d) 0.030 e) none of these @OL' 3' 4. Mercury is a: a) mixture b) halogen c) pure substance (1) compound e) none of these 5. The fact that mercury is a liquid at room temp. is a: a) chemical property b) physical property c) neither a chemical nor physical property 6. The fact that mercury combines with oxygen to form mercuric oxide is a: a) chemical property b) physical property c) neither a chemical nor physical property Consider the following isotopes of elemental carbon for question 7: C - 12. C — 13 C — l4 (carbon—12) (carbon-I3) ( carbon 14) 7. Circle the true statement: , a) All three isotopes have the same number of neutrons. )3)" All three isotopes have the same mass number. M’The isotopic abundance in nature of all three isotopes is roughly equal. {rah/All three isotopes have at least six neutrons. e) None of the above statements is true. _____‘_*\$__hq_ﬁ_hhﬁﬁai __:' QK::QLE\' Fe 6* 5 8. The formula for iron (III) sulfate is: a) FC3SO4 1804 C) F6803 Cl) F62(SO4)3 e) Pb3(SO4)2 9. The formula for phosphoric acid is; a) H2P(aq) K b3) HPZQQ) c) RH3PO4(aq) d) H2PO3(aq) e) H2PO4(aq) [ s1 10. The formula for dichlorine hexoxide is: a) C1602 b) C105 0) (C102)3 d) (C1032 e) C1205 11. The only formula below which is correct is: a} K3804 r28 C) A12(C2H302)3 ,d} Nao2 e)_ g(N03)2 Answer A for True and B for False for questions 12-20. 12. The only neutral atom with 31 protons and 31 electrons is phosphorus}D 13. If 2 of hydrogen combined with ﬁg of oxygen to form 18 g of water, there would be 2_g 0L9);ng leﬁ over. in H '\ H w s as l .u *7) as 14. The percent by mass nitrogen in ammonia is 82.35%. N _ 3 if- ; —, “(a u 1.0 ‘“ 15. Ice ﬂoats because liquid water is less dense than solid water. I f W 9 MAW! sf 16. Ba+2 and-Te'2 both have 54 electrons. a 17. For every 12 g of carbon, 24 g of oxygen will be needed to form the carbon dioxide compound. 18. Elemental chlorine isCIg. 19. The smallest piece of a compound that can exist is called a molecule. 20. The fact that water in a puddle expands when it freezes is an example of a physical property of water. Part [I - Problems (40 pts) SHOW WORK! 1. (4 pts ea) 3 a) Write the symbol for the group VI A non—metal which is in the third period: c) The typical ion that this non-metal will f0 in an ionic compound is: L): +6" " glam? 4 H4 “Yb—us ﬂake” (09H: ‘ 6 . . . . . . M (W) d) Give an example of an ionic compound involvmg this non-metal: (w ' e the formula) e) An aqueous solution of the above compound W l l l conduct electric current. ( will/will not ) b) The name of this non-metal iszikgic; ﬁzz-Ckﬂ—rxsu/ ‘. a r ‘ 3 M a"! —_. _'(]‘-5r.r- 1" F a r; C.» 2. (5 pts) Explain why an egg smks in (deionized) tap water and ﬂoats in very salty water. TLQ f'é’acaoawl’w 4L4. 8% 9{n\<\$ {nﬁpwcwler I"; bergiﬂ~grg+ﬁga bum-Afar ' less c\‘€mgQ +1 ’HﬂGA (36:33 L' La Iii/x W J -' A ‘r ‘ c l W exam /e +/ m 7’7) Wu M M122. (amparpd 4o JCPQA, 1+ :‘SiQSI'E/jﬁj j D(69’\ berm/‘54 04‘ +14 Sat lit/“JFK 3. (5 pts) Convert 15°C to °F. .. ’ 7 C 1%; (ﬂag) 1' T, :. ﬁ/§(I§‘+%lj ﬁt 7C/O"7i 5:1 ) U\\A> 4. (5 pts) A postage stamp measures 4.0 cm long by 2.5 cm wide. Calculate the area of the stamp in mm’, as you did in lab. 1;, 5. (5 pts) Determine your weight (or your “dream weight") in Kg and in centigrams. First, supply your weight (or “dream weight”) in english units: t \I/ l (1 0 pounds - 2 {c Iu K) / '5 K e \60000 WWW” WC 1%: 3’ J / (Pr-\skcyaw'oz |.Ca ICC/K JO ***** EXTRA CREDIT ***** Spoints A 7.00 inch diameter pizza is \$4.95 and a 14.0 inch diameter pizza is \$13.95. Which size is the best buy? (Use calculations to support your answer. Area = H r2 ) Q{€& b‘lg'i' \PWJ \ﬁs “H4, Win (\Y0Me‘i4f bet/adage inf-TU {AME/0i Lyciuﬂ +0 blij L/iMr/QH '7'“ [drinks-+0 l4? ﬂﬂci —<{> ...
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