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BOND ENERGY MCQs

Total Questions : 20 | Page 1 of 2 pages
Question 1. Which is an example of an endothermic physical reaction?
  1.    Ice melting 
  2.    Combustion 
  3.    Steam condensing 
  4.    Photosynthesis
 Discuss Question
Answer: Option A. -> Ice melting 
Question 2. How many electrons are shared in one chemical bond?
  1.    2
  2.    4
  3.    6
  4.    8
 Discuss Question
Answer: Option A. -> 2
Question 3. How can we figure out if an overall reaction is endo- or exo-thermic? It is the difference between _______ and __________
  1.    hot and cold temperatures
  2.    energy to break and energy to form bonds.
  3.    time to form a bond versus time to break a bond
  4.    None of these
 Discuss Question
Answer: Option B. -> energy to break and energy to form bonds.
Question 4. How many valence electrons do most electrons want in their valence shell to be stable? (Except hydrogen!)
  1.    2
  2.    4
  3.    6
  4.    8
 Discuss Question
Answer: Option D. -> 8
Question 5. When bonds are _________, energy is released
  1.    formed
  2.    exothermic
  3.    Both A & B
  4.    All of above
 Discuss Question
Answer: Option A. -> formed
Question 6. True or false: when bonds are broken the energy is positive because energy goes into the system
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 7. This is the number of years that Kuppler has been teaching at Kingsway:
  1.    3 years
  2.    5 years
  3.    9 years
  4.    10 years
 Discuss Question
Answer: Option C. -> 9 years
Question 8. Which statements about exothermic reactions are correct?I
  1.    I and II only
  2.    I and III only
  3.    II and III only
  4.    I, II, and III
 Discuss Question
Answer: Option D. -> I, II, and III
Question 9. What kind of energy change happens in the photosynthesis reaction in plant leaves?
  1.    Endothermic
  2.    Exothermic
  3.    No change
  4.    Both A & B
 Discuss Question
Answer: Option A. -> Endothermic
Question 10. How can you determine an atom's valence electrons?
  1.    the column on the periodic table
  2.    the row on the periodic table
  3.    the atomic number
  4.    the atomic mass
 Discuss Question
Answer: Option A. -> the column on the periodic table

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