June 2012 Chemistry Regents #21-30

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

Question 51 Questions 52-55 Questions 56-59 Questions 60-62 Questions 63-65 Questions 66-68 Questions 69-71 Questions 72-75  Questions 76-78  Questions 79-81  Questions 82-85

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21 Which type of concentration is calculated when the grams of solute is divided by the grams of the solution, and the result is multiplied by 1 000 000?

(1) molarity        (2) parts per million

(3) percent by mass    (4) percent by volume

2 link ummm,  PPM Table T
22 Which type of energy is associated with the random motion of atoms and molecules in a sample of air?

(1)  chemical energy   (2)  electrical energy  (3) nuclear energy  (4)  thermal energy

4 link energy of motion is kinetic energy

avg. KE is temperature (thermal)

23 The temperature of a sample of matter is a measure of the

(1) total kinetic energy of the particles in the sample

(2)  total potential energy of the particles in the sample

(3)  average potential energy of the particles in the sample

(4)  average kinetic energy of the particles in the sample

4 link avg. KE is temperature

 

24 What unit is used to express the pressure of a gas?

(1)  mole  (2)  joule  (3) kelvin   (4)  pascal

4 link On table D
25 Which sample of matter sublimes at room temperature?

(1)  Br2(l)  (2)  Cl2(g)   (3) CO2(S) (4)  SO2(aq)

3 link CO2(s) is dry ice and sublimes
26 Given the diagram representing a closed system at constant temperature:

Which statement describes this system at equilibrium?

(1) The mass of H2O(l) equals the mass of H2O(g)

(2) The volume of H2O(l) equals the volume of H2O(g)  

(3)  The number of moles of H2O(l) equals the number of moles of H2O(g)

(4)  The rate of evaporation of H2O(l) equals the rate of condensation of H2O(g)

4 link at equilibrium

Con Con Requal

concentrations constant rates are equal

 

27 Which reaction occurs at the cathode in an electrochemical cell?

(1) combustion (2) neutralization (3) oxidation (4) reduction

4 link RedCat  AnOX
28 Which yields H+(aq) as the only positive ion in an aqueous solution?

 (1) CH3CHO    (2) CH3CH2OH    (3) CH3COOH    (4) CH3OCH3

3 link H+ ...acid..Table K

CH3COOH

 

29 Compared to the mass and the penetrating power of an alpha particle, a beta particle has

(1) less mass and greater penetrating power

(2) less mass and less penetrating power  

(3) more mass and greater penetrating power 

(4) more mass and less penetrating power

1 link beta is an electron  alpha is helium

helium is stopped easier than an electron

30 During a nuclear reaction, mass is converted into

(1) charge  (2) energy (3) isomers (4) volume

2 link mass turns into energy

E=mc2

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

Question 51 Questions 52-55 Questions 56-59 Questions 60-62 Questions 63-65 Questions 66-68 Questions 69-71 Questions 72-75  Questions 76-78  Questions 79-81  Questions 82-85

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