June 2006 Chemistry Regents #41-50

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

 

Questions

Answer Explanations
41 Which Kelvin temperature is equivalent to 24C?
(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 75C?
(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 CH3CH2CH2CHO?
(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 CaSO4(s) in a neutralization reaction?
(1) H2S(g) and Ca(ClO4)2(s)
(2) H2SO3(aq) and Ca(NO3)2(aq)
(3) H2SO4(aq) and Ca(OH)2(aq)
(4) SO2(g) and CaO(s)
3  H2SO4(aq)+ Ca(OH)2(aq)==> CaSO4(s) +H2O(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) CH3OH    (3) HBr
(2) LiBr          (4) LiOH
3 Must be an Acid
49 What is the half-life of sodium-25 if 1.00 gram of a 16.00-gram sample of sodium-25 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

Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

 
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