January 2015 Chemistry Regents #41-45

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Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Question 51-53 Questions 54-55
 Questions 56-58 Questions 59-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-72  Questions 73-75  Questions 76-78  Questions 79-81 Questions 82-85

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Questions

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Explanations

41 Which two compounds are electrolytes?

(1) KOH and CH3COOH

 (2) KOH and C5H12

(3) CH3OH and CH3COOH

(4) CH3OH and C5H12

1 link Acid, Base or soluble salt
42 Which statement explains why a CO2 molecule is nonpolar?

 (1) Carbon and oxygen are both nonmetals.

 (2) Carbon and oxygen have different electronegativities.

 (3) The molecule has a symmetrical distribution of charge.

(4) The molecule has an asymmetrical distribution of charge.

3 link SNAP Symmetrical is nonpolar asym. is polar
43 Which temperature change indicates an increase in the average kinetic energy of the molecules in a sample?

(1) 15C to 298 K (3) 305 K to 0C

(2) 37C to 273 K (4) 355 K to 25C

1 link Avg. KE is temperature

C=K + 273

 

44 Given the particle diagram:

Which substance at STP can be represented by this particle diagram? (1) N2 (3) Mg

(2) H2 (4) Kr

3 link At STP the only solid is Mg. The others are gases.
45 Which type of equilibrium exists in a sealed flask containing Br2(ℓ) and Br2(g) at 298 K and 1.0 atm?

(1) static phase equilibrium

(2) static solution equilibrium

(3) dynamic phase equilibrium

(4) dynamic solution equilibrium

3 link liquid and gas are in a phase equilibrium

 

Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Question 51-53 Questions 54-55
 Questions 56-58 Questions 59-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-72  Questions 73-75  Questions 76-78  Questions 79-81 Questions 82-85

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