June 2005 Chemistry Regents #21-30

Highlight to reveal answers and explanations

Back to Regents Exams

 

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

 
Back to Regents Exams