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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Explanations

41 Which two compounds are electrolytes?

(1) KOH and CH3COOH

 (2) KOH and C5H12

(3) CH3OH and CH3COOH

(4) CH3OH and C5H12

1linkAcid, 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.

3linkSNAP 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) 15°C to 298 K (3) 305 K to 0°C

(2) 37°C to 273 K (4) 355 K to 25°C

1linkAvg. 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

3linkAt 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

3linkliquid 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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