January 2005 Chemistry Regents #21-30

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

 

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Questions

AnswerExplanations
21 Which pair of compounds are isomers?
(1) NO2 and N2O4
(2) P2O5 and P4O10
(3) HCOOH and CH3COOH
(4) CH3OCH3 and C2H5OH		4Organic (carbon) same formula different structure
22 Which organic compound is unsaturated?
(1) 2-methylbutane      (3) 2-hexanol
(2) 2-chloropropane    (4) 2-pentene		4Unsaturated= Alkynes or alkenes
23 Which change in oxidation number indicates oxidation?
(1) –1 to +2    (3) +2 to –3
(2) –1 to –2    (4) +3 to +2		1oxidation number increases

1 goes up

the other 3 go down

24 Given the redox reaction:
Cr3+ + Al-->Cr + Al3+
As the reaction takes place, there is a transfer of
(1) electrons from Al to Cr3+
(2) electrons from Cr3+ to Al
(3) protons from Al to Cr3+
(4) protons from Cr3+ to Al		1electrons lose to gain

oxidation to reduction or

USE TABLE J--> TOP TO BOTTOM

25 The compound HNO3 can be described as an
(1) Arrhenius acid and an electrolyte
(2) Arrhenius acid and a nonelectrolyte
(3) Arrhenius base and an electrolyte
(4) Arrhenius base and a nonelectrolyte		1H+ acid and electrolytes
26 According to Reference Table M, what is the color of the indicator methyl orange in a solution that has a pH of 2?
(1) blue        (3) orange
(2) yellow    (4) red		4Look at Table M
27 Given the reaction:
NH3 + HCl --> NH4Cl
In this reaction, ammonia molecules (NH3) act as a base because they
(1) accept hydrogen ions (H+)
(2) accept hydroxide ions (OH-)
(3) donate hydrogen ions (H+)
(4) donate hydroxide ions (OH-)		1Bronsted Lowry Acid base Theory
11 reactant
29 Which statement best describes gamma radiation?
(1) It has a mass of 1 and a charge of 1.
(2) It has a mass of 0 and a charge of –1.
(3) It has a mass of 0 and a charge of 0.
(4) It has a mass of 4 and a charge of +2.		3see answer
30 Which change takes place in a nuclear fusion reaction?
(1) Matter is converted to energy.
(2) Energy is converted to matter.
(3) Ionic bonds are converted to covalent bonds.
(4) Covalent bonds are converted to ionic bonds.		1NUCLEAR energy comes from mass

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

 
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