June 2013 Chemistry Regents #31-40

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Question 51-53 Questions 54-56 Questions 57-59 Questions 60-62 Questions 63-65 Questions 66-69 Questions 70-73 Questions 74-77  Questions 78-80  Questions 81-82  Questions 83-85

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31 The diagram below represents the bright-line spectra of four elements and a bright-line spectrum produced by a mixture of three of these elements.

Which element is not present in the mixture?

(1) A (2) D (3) X (4) Z

 
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32 What is the overall charge of an ion that has 12 protons, 10 electrons, and 14 neutrons?

(1) 2-     (3) 4­

(2) 2+    (4) 4+

2    

33 As the elements in Period 3 are considered in order of increasing atomic number, there is a general decrease in

(1) atomic mass (2) atomic radius

(3) electronegativity (4) first ionization energy

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34 Which electron configuration represents the electrons of a sulfur atom in an excited state?

(1) 2-6-6 (3) 2-8-4

(2) 2-7-7 (4) 2-8-6

2    

35 Given the word equation:

sodium chlorate ==> sodium chloride + oxygen

Which type of chemical reaction is represented by this equation?

(1) double replacement (3) decomposition

(2) single replacement (4) synthesis

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36 Which compound has the highest percent com­position by mass of strontium?

(1) SrC12 (2) SrI2 (3) SrO  (4) SrS

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37 Given the formula for hydrazine:

How many pairs of electrons are shared between the two nitrogen atoms?

(1) 1    (3) 3

(2) 2    (4) 4

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38 Which formulas represent one ionic compound and one molecular compound?

(1) N2 and SO2  (2) Cl2 and H2S

(3) BaCl2 and N2O4(4) NaOH and BaSO4

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39 Which Kelvin temperature is equal to 200.oC?

(1) -73 K   (2) 73 K (3) 200. K (4) 473 K

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A 10.0-gram sample of H2O(l) at 23.0°C absorbs 209 joules of heat. What is the final temperature of the H2O(l) sample?

(1) 5.0°C (3) 28.0°C

(2) 18.0°C (4) 50.0°C

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Question 51-53 Questions 54-56 Questions 57-59 Questions 60-62 Questions 63-65 Questions 66-69 Questions 70-73 Questions 74-77  Questions 78-80  Questions 81-82  Questions 83-85

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