June 2011 Chemistry Regents #21-30

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Questions

Answer Link Explanations
21 Given the formula of the functional group:

An organic compound that has this functional group is classified as

(1) an acid  (2) an aldehyde  (3) an ester  (4) a ketone

1 Link this is an organic acid look at table R
22 Which statement describes where oxidation and reduction half-reactions occur in an operating electrochemical cell?

(1) Oxidation and reduction both occur at the anode

(2) Oxidation and reduction both occur at the cathode

(3) Oxidation occurs at the anode and  reduction occurs at the cathode

(4) Oxidation occurs at the cathode and  reduction occurs at the anode

3 Link An OX  Anode-oxidation

Red Cat   Cathode reduction

2 Link  move the C=O to another carbon
24. Which energy conversion occurs in an operating electrolytic cell?

(1) chemical energy to electrical energy

(2) electrical energy to chemical energy

(3) nuclear energy to thermal energy

(4) thermal energy to nuclear energy

2 Link electrolytic requires a power source for a reaction to occur
25 Which compounds are classified as electrolytes?

(1) alcohols  (2) alkynes  (3) organic acids  (4)  saturated hydrocarbons

3 Link electrolytes are acids bases and soluble salts (ionic)
26 Potassium hydroxide is classified as an Arrhenius base because KOH contains

(1) OH- ions  (2) O2- ions  (3) K+ ions  (4) H+ ions

1 Link Arrhenius bases contain OH-
27 In which laboratory process is a volume of solution of known concentration used to determine the concentration of another solution?

(1) deposition  (2) distillation  (3) filtration  (4) titration

4 Link titrations use a known volume and concentration (usually acids or bases) to determine the concentration of an unknown, using an indicator to determine the equivalence point
28 According to one acid-base theory, an acid is an

(1) H+ acceptor  (2)  H+ donor  (3) OH- acceptor  (4) OH- donor

2 Link Bronsted Lowery (the other theory)

acids are proton (H+) donors and bases accept protons

29 Energy is released during the fission of Pu-239 atoms as a result of the

(1) formation of covalent bonds

(2) formation of ionic bonds

(3) conversion of matter to energy

(4) conversion of energy to matter

3 Link Energy releases from fission is due to matter being converted to energy

E=mc2

30 Atoms of I-131 spontaneously decay when the

(1) stable nuclei emit alpha particles

(2) stable nuclei emit beta particles

(3) unstable nuclei emit alpha particles

(4) unstable nuclei emit beta particles

4 Link atoms decay because of unstable nuclei

I-131 has a beta minus decay (Table N)

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

Question 51 Questions 52-54 Questions 55-59 Questions 60-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-70 Questions 71-73 Questions 74-76 Questions 77-79 Questions 80-82 Questions 83-85

 
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