August 2017 Chemistry Regents #21-25

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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 51-52 Questions 53-54 Questions 55-58 Questions 59-60 Questions 61-65 Questions 66-68 Questions 69-72 Questions 73-77  Questions 78-81  Questions 82-85

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21 At STP, a 12.0-liter sample of CH4(g) has the same total number of molecules as

(1) 6.0 L of H2(g) at STP

(2) 12.0 L of CO2(g) at STP

(3) 18.0 L of HCl(g) at STP

(4) 24.0 L of O2(g) at STP

2 same volume of a GAS same number of molecules

22 At standard pressure, during which physical change does the potential energy decrease?

(1) liquid to gas                 (3) solid to gas

(2) liquid to solid              (4) solid to liquid

2 S...L..G question

L-->G

S<--L

S---->G

S---->L

23 Which equation represents a chemical equilibrium?

(1) N2(ℓ) <=> N2(g)

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

(3) CO2(s)  <=>CO2(g)

(4) NH3(ℓ) <=> NH3(g)

2 needs different substance formed

 

24 The amount of randomness of the atoms in a system is an indication of the

(1) entropy of the system

(2) polarity of the system

(3) excited state of the atoms

(4) ground state of the atoms

1 definition of entropy

25 When a sample of Ca(s) loses 1 mole of electrons in a reaction with a sample of O2(g), the oxygen

(1) loses 1 mole of electrons

(2) loses 2 moles of electrons

(3) gains 1 mole of electrons

(4) gains 2 moles of electrons

3 conservation of mass and charge

lose equals gain

 

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 51-52 Questions 53-54 Questions 55-58 Questions 59-60 Questions 61-65 Questions 66-68 Questions 69-72 Questions 73-77  Questions 78-81  Questions 82-85

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