June 2022  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 51-53 Questions 54-56 Questions 57-58 Questions 59-60 Questions 61-65 Questions 66-70 Questions 71-73 Questions 74-77 Questions 78-82 Questions 83-85

 

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41 Based on Table G, which solute sample in l00.g of water at 40.°C can produce a solution equilibrium in a closed system?

(1) 10.g KClO3     (3) 45 g KCl

(2) 25 g NaCl      (4) 55g KNO3

 3   equilibrium is saturated...on the mass and temperature need to fall on the line

or in this case saturated with excess, so above the line

(Hey 3 are below the line only 1 is above...that is how multiple choice works)
42 Given the equation representing a system at equilibrium:

2SO2(g) + O2(g) <=> 2SO3(g) + energy

Which change favors the forward reaction?

(1) increasing the concentration of O2(g)

(2) increasing the temperature

(3) decreasing the pressure

(4) decreasing the concentration of SO2(g)

 1   LeChaterlier's principle

increasing a reactant shift to the right
43 When ice, H2O(s), melts at 0°C, entropy increases because the

(1) average kinetic energy of the particles increases

(2) average kinetic energy of the particles decreases

(3) particle arrangement is more random

(4) particle arrangement is less random

 3   entropy is randomness, based on how many different particle arrangements it can have

 

 

 

44 At STP, propanal and propanone have different chemical properties due to their different

(1) molecular masses

(2) empirical formulas

(3) percent compositions

(4) functional groups

 4   organic chem....these are isomers of each other and differ chemically because of functional groups
45 Given the formula for a compound:

What is the IUPAC name of the compound?

(1) 2,3-dimethyloctane

(2) 2,3-dimethylhexane

(3) 4,5-dimethyloctane

(4) 4,5-dimethylhexane

 2   start numbering from the right

 

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 51-53 Questions 54-56 Questions 57-58 Questions 59-60 Questions 61-65 Questions 66-70 Questions 71-73 Questions 74-77 Questions 78-82 Questions 83-85

 

 

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