June 2005 Chemistry Regents #21-30

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

Questions	Answer	Explanations
21 Which element has atoms that can bond with each other to form long chains or rings? (1) carbon          (3) oxygen (2) nitrogen        (4) fluorine	1	standard organic chemistry question carbon does this
22 Which formula represents an unsaturated hydrocarbon? (1) C2H6          (3) C5H8 (2) C3H8          (4) C6H14	3	not an alkane, so not CnH2n+2
	2	double bond is an alkene ends with -ene
24 What is the oxidation state of nitrogen in NaNO2? (1) +1 (3) +3 (2) +2 (4) +4	3	N =+1      O = -2 -2 so N= +3 they have to add up to zero
25 The three isomers of pentane have different (1) formula masses (2) molecular formulas (3) empirical formulas (4) structural formulas	4	isomers same formula different structures
26 Where does oxidation occur in an electrochemical cell? (1) at the cathode in both an electrolytic cell and a voltaic cell (2) at the cathode in an electrolytic cell and at the anode in a voltaic cell (3) at the anode in both an electrolytic cell and a voltaic cell (4) at the anode in an electrolytic cell and at the cathode in a voltaic cell	3	An OX Anode Oxidation in either cell
27 Which formula represents an electrolyte? (1) CH3OCH3     (3) CH3COOH (2) CH3OH         (4) C2H5CHO	3	Acids Bases or salts 3 organic acid
28 When an Arrhenius acid dissolves in water, the only positive ion in the solution is (1) H+     (3) Na+ (2) Li+     (4) K+	1	Acid==> H+ sometimes they throw H3O+
29 What is the half-life and decay mode of Rn-222? (1) 1.91 days and alpha decay (2) 1.91 days and beta decay (3) 3.82 days and alpha decay (4) 3.82 days and beta decay	3	See Table N
	2	Transmutation- change in element

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

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