January 2016 Chemistry Regents #31-35

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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 54-56
 Questions 57-61 Questions 62-65 Questions 66-68 Questions 69-72  Questions 73-75  Questions 76-78  Questions 79-82 Questions 83-85

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31  Which electron configuration represents an atom of chlorine in an excited state?

(1) 27-7     (3) 2-8-7

(2) 2-7-8      (4) 2-8-8

2   ground state 2-8-7   (17 ELECTRONS)

excited state moves an electron to a higher energy level

2-7-8  still has 17 electrons

32    Given the balanced equation representing a reaction occurring at 101.3 kilopascals and 298 K.

2H2(g) + O2(g) → 2H2O(l) + energy

What is the net amount of energy released when one mole of H2O(l) is produced?

(1) 241.8 k]      (3)  4836kJ

(2)  285.8 k]        (4)  571.6 k]

2   the reaction is for 2 moles of water so cut the amount in half
33   Element X reacts with copper to form the compounds CuX and CuX2. In which group on the Periodic Table is element X found?

(1) Group 1    (3) Group 13

(2) Group 2    (4) Group 17

4   X must be -1 so group 17

since Cu can only be +1 or +2

 

34   What is the mass of 1.5 moles of CO2?

(1) 66 g      (3) 33 g

(2) 44 g      (4) 29 g

1   1.5 moles x 44 grams /mole
35  Given the balanced equation representing a reaction:

K2CO3(aq) + BaCl2(aq) → 2KCl(aq) + BaCO3(s)

Which type of reaction is represented by this equation?

(1) synthesis

(2) decomposition

(3) single replacement

(4) double replacement

4   double replacement double switches ions

 

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 54-56
 Questions 57-61 Questions 62-65 Questions 66-68 Questions 69-72  Questions 73-75  Questions 76-78  Questions 79-82 Questions 83-85

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