January 2017 Chemistry Regents #11-15

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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 54-55
 Questions 56-57 Questions 58-59 Questions 60-61 Questions 62-65  Questions 66-68  Questions 69-72  Questions 73-77 Questions 78-79 Questions 80-82 Questions 83-85
 

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Questions

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Explanations

11 How many pairs of electrons are shared between the nitrogen atoms in a molecule of N2?

(1) 5 (3) 3

(2) 2 (4) 6

3   triple bond

3 pairs of electrons

12 A molecule must be nonpolar if the molecule

(1) is linear

(2) is neutral

(3) has ionic and covalent bonding

(4) has a symmetrical charge distribution

4   SNAP

 

Symmetrical is nonpolar

13 Which property is used to determine the degree of polarity between two bonded atoms?

(1) density             (3) pressure

(2) electronegativity (4) temperature

2   Bond...BEND

Bonding ElectroNegativity differences

 

14 In a chemical reaction, a catalyst provides an alternate reaction pathway that

(1) decreases the concentration of the products

(2) increases the concentration of the reactants

(3) has a lower activation energy

(4) has a higher activation energy

3   catalyst lowers the activation energy
15 Which substance can be decomposed by chemical means?

(1) cobalt (3) methane

(2) krypton (4) zirconium

3   a compound...methane CH4

the other 3 are elements

 

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 54-55
 Questions 56-57 Questions 58-59 Questions 60-61 Questions 62-65  Questions 66-68  Questions 69-72  Questions 73-77 Questions 78-79 Questions 80-82 Questions 83-85
 

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