August 2007 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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Answer Explanations
21 Given the balanced equation representing a reaction:
Cl2(g) ==> Cl(g) + Cl(g)
What occurs during this change?
(1) Energy is absorbed and a bond is broken.
(2) Energy is absorbed and a bond is formed.
(3) Energy is released and a bond is broken.
(4) Energy is released and a bond is formed.
1 a bond was broken, the atoms are separated

energy is absorbed

22 A molecule of butane and a molecule of 2-butene both have the same total number of
(1) carbon atoms      (3) single bonds
(2) hydrogen atoms   (4) double bonds
1 but- 4 carbons
23 Which general formula represents the homologous series of hydrocarbons that includes the compound l-heptyne?
(1) CnH2n6 (3) CnH2n
(2) CnH2n2 (4) CnH2n+2
2 yne= alkynes

table Q

24 Which two compounds are isomers of each other?
(1) CH3CH2COOH and CH3COOCH2CH3
(2) CH3CH2CHO and CH3COCH3
(3) CH3CHBrCH3 and CH2BrCHBrCH3
(4) CH3CHOHCH3 and CH3CHOHCH2OH
2 same formula different structures

count atoms

2 unsaturated (contains a double or triple bond)

hydrocarbon carbon and hydrogen only

26 Which formula represents a hydronium ion?
(1) H3O+ (3) OH
(2) NH4+ (4) HCO3
1 Table E
27 Which compound is an Arrhenius acid?
(1) H2SO4     (3) NaOH
(2) KCl         (4) NH3
1 starts with H
2 Table N
29 Which nuclear emission has the greatest penetrating power?
(1) alpha particle   (3) gamma radiation
(2) beta particle    (4) positron
3 most gamma, beta, alpha least
30 What is the mass number of an alpha particle?
(1) 1    (3) 0
(2) 2    (4) 4
4 table O, top number

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

 
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