June 2014 Chemistry Regents #21-25

Highlight to reveal answers and explanations

 

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 51-54 Questions 55-56 Questions 57-58 Questions 59-61 Questions 62-65 Questions 66-69 Questions 70-72 Questions 73-75  Questions 76-79  Questions 80-82  Questions 83-85

Other Regents Exams

 

 

Questions

Answer Links

Explanations

21 Given the balanced equation representing a reaction:

                O2 --> O  + O

What occurs during this reaction?

(1) Energy is absorbed as bonds are broken.

(2) Energy is absorbed as bonds are formed.

(3) Energy is released as bonds are broken.

(4) Energy is released as bonds arc formed.

1 link the molecule is broken down into atoms

breaking bonds requires energy

22 In terms of entropy and energy, systems in nature tend to undergo changes toward

(1 ) lower entropy and lower energy

(2) lower entropy and higher energy

(3) higher entropy and lower energy

(4) higher entropy and higher energy

3 link nature tends to go towards lower energy and more randomness

think Lord of the Flies....chaos and fire

23 Which term is defined as the difference between the potential energy of the products and the potential energy of the reactants in a chemical reaction?

(1) activation energy  (3) heat of fusion

(2) thermal energy      (4) heat of reaction

4 link heat of reaction=Energy products- Energy reactants

 

24  What is the atomic number of the element whose atoms bond to each other in chains, rings, and networks?

(1) 10     (3) 6

(2) 8      (4) 4

3 link Carbon is the element with the atomic #6
25  How many pairs of electrons are shared between two adjacent carbon atoms in a saturated hydrocarbon?

 

(1) 1    (3) 3

(2) 2    (4)  4

1 link saturated is all single bonds

a single bond is 2 shared electrons or 1 PAIR

 

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 51-54 Questions 55-56 Questions 57-58 Questions 59-61 Questions 62-65 Questions 66-69 Questions 70-72 Questions 73-75  Questions 76-79  Questions 80-82  Questions 83-85

Back to Regents Exams