June 2019  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

Questions 51 Questions 52-54 Questions 55-57 Questions 58-61 Questions 62-65 Questions 66-69 Questions 70-73 Questions 74-77 Questions 78-80 Questions 81-85  

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41 What is the amount of heat absorbed when the temperature of 75 grams of water increases from 20.oC to 35oC?

(1)  1100J

(2)  4700J

(3)  6300J

(4)  11000J

 

2  Q=MC delta T

Q=75g x 4.18 x (35-20)

42 Which sample of HCl(aq) reacts at the fastest rate with a 1.0-gram sample of iron filings?

(1)  10. mL of 1 M HCl(aq)  at 10oC

(2)  10. mL of 1 M HCl(aq)  at 25oC

(3)  10. mL of 3 M HCl(aq)  at 10oC

(4)  10. mL of 3 M HCl(aq)  at 25oC

 

 4  highest concentration...molarity

highest temp

43 Given the equation representing  system at equilibrium:

N2O4(g) <=> 2NO2(g)

Which statement describes the concentration of the two gases in this system

(1) The concentration of N2O4(g) must be less than the concentration of NO2(g)

(2) The concentration of N2O4(g) must be greater than the concentration of NO2(g)

(3)  The concentration of N2O4(g) and the concentration of NO2(g) must be equal.

(4)  The concentration of N2O4(g) and the concentration of NO2(g) must be constant.

 

 4  equilibrium...Con Con requal

Concentrations constant

rates are equal

 

44 Given the equation representing a system at equilibrium:

PCl5(g) + energy <=> PCl3(g) + Cl2(g)

Which change will cause the equilibrium to shift to the right?

(1)  adding a catalyst

(2)  adding more PCl3(g)

(3)  increasing the pressure

(4)  increasing the temperature

 

 4  adding energy (temp) shift to the other side

45

 3  5 carbon amine

 

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

Questions 51 Questions 52-54 Questions 55-57 Questions 58-61 Questions 62-65 Questions 66-69 Questions 70-73 Questions 74-77 Questions 78-80 Questions 81-85  

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