
June 2006 Chemistry Regents #4150
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Questions 
Answer  Explanations 
41 Which Kelvin temperature is equivalent to –24°C? (1) 226 K (3) 273 K (2) 249 K (4) 297 K 
2  K=C + 273 Table T 
42 Which substance has the lowest vapor pressure at 75°C? (1) water (3) propanone (2) ethanoic acid (4) ethanol 
2  Table H 
43 What is the IUPAC name for the compound that has the
condensed structural formula CH_{3}CH_{2}CH_{2}CHO? (1) butanal (3) propanal (2) butanol (4) propanol 
1  draw it out 4 carbons but al CH=O 
44 What volume of 0.500 M HNO3(aq) must completely react
to neutralize 100.0 milliliters of 0.100 M KOH(aq)? (1) 10.0 mL (3) 50.0 mL (2) 20.0 mL (4) 500. mL 
2  titration MV=MV Table T 
2  Table R  
3  Fermentation Ethanol is produced or find the missing atoms 

47 Which reactants form the salt CaSO_{4(s)} in a
neutralization reaction? (1) H_{2}S_{(g)} and Ca(ClO_{4})_{2(s)} (2) H_{2}SO_{3(aq)} and Ca(NO_{3})_{2(aq)} (3) H_{2}SO_{4(aq)} and Ca(OH)_{2(aq)} (4) SO_{2(g)} and CaO_{(s)} 
3  H_{2}SO_{4(aq)}+ Ca(OH)_{2(aq)==> }CaSO_{4(s)} +H_{2}O_{(l)} 
48 A student tested a 0.1 M aqueous solution and made the
following observations: • conducts electricity • turns blue litmus to red • reacts with Zn(s) to produce gas bubbles Which compound could be the solute in this solution? (1) CH_{3}OH (3) HBr (2) LiBr (4) LiOH 
3  Must be an Acid 
49 What is the halflife of sodium25 if 1.00 gram of a
16.00gram sample of sodium25 remains unchanged after 237 seconds? (1) 47.4 s (3) 79.0 s (2) 59.3 s (4) 118 s 
2  16>8>4>2>1 4 half lives 237s/4= 
2  wave model=electron locations are base on probability 
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