June 2012  Chemistry Regents #11-20

Highlight to reveal answers and explanations

 

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

Question 51 Questions 52-55 Questions 56-59 Questions 60-62 Questions 63-65 Questions 66-68 Questions 69-71 Questions 72-75  Questions 76-78  Questions 79-81  Questions 82-85

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11 Which phrase describes the distribution of charge and polarity in a CH4 molecule?

(1) symmetrical and polar      (2) symmetrical and nonpolar  

(3) asymmetrical and polar    (4)asymmetrical and nonpolar

2 link SNAP  symmetrical nonpolar

asymmetrical polar

12 What is the charge of the nucleus of an oxygen atom?

(1) 0   (2)  -2    (3)   +8   (4)  +16

3 link oxygen has 8 protons in the nuclues
13 Which has no electrons?

(1) H+ (2)  Li(3) Na+ (4) Rb+

1 link a hydrogen atom has 1 protons and 1 electron, but H+ has lost that electron

 

14 To break a chemical bond, energy must be

(1) absorbed    (2)  destroyed  (3) produced   (4)  released

1 link breaking bonds absorbs energy
15 Which  Lewis electron-dot diagram represents a nitrogen atom in the ground state?

3 link 2-5  nitrogen will have 5 dots
16 What is the most likely electronegativity value for a metallic element?

(1)  1.3    (2) 2.7    (3) 3.4    (4) 4.0

1 link Table S, pick a random metal and it will have a low electronegativity value

 

17 Which polyatomic ion has a charge of 3-?

(1) chromate ion  (2) oxalate ion  (3) phosphate ion (4)  thiocyanate ion

3 link Table E
18 Every chlorine atom has

(1) 7 electrons             (2) 17 neutrons

(3) a mass number of 35   (4) an atomic number of 17

4 link all atoms of Cl have an atomic number of 17

 

19 Which substance can not be broken down by a chemical change?

(1)  ammonia  (2) methanol (3) propane (4)  phosphorous

4 link pick the element
20 At standard pressure, which substance becomes less soluble in water as temperature increases from 10.oC to 80.OC?

(1) HCl   (2) KCl   (3)NaCl  (4)NH4Cl

1 link Use Table G, HCl is a gas and slopes down

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

Question 51 Questions 52-55 Questions 56-59 Questions 60-62 Questions 63-65 Questions 66-68 Questions 69-71 Questions 72-75  Questions 76-78  Questions 79-81  Questions 82-85

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