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CHEMICAL REACTIONS MCQs

Total Questions : 24 | Page 3 of 3 pages
Question 21. The word reduction describes
  1.    gain of electrons 
  2.    loss of electrons 
  3.    number of electrons remains the same
  4.    transfer of electrons
 Discuss Question
Answer: Option A. -> gain of electrons 
Question 22. True or FalseIn a chemical reaction, no new atoms are created, and no atoms are destroyed
  1.    true
  2.    false
 Discuss Question
Answer: Option A. -> true
Question 23. A chemical change is different than a physical change because in a chemical change
  1.    Chemicals are used
  2.    Molecules do not physically touch
  3.    A new substance is formed and in a physical change no new substance is formed
  4.    The change can be seen but in a physical change it cannot
 Discuss Question
Answer: Option C. -> A new substance is formed and in a physical change no new substance is formed
Question 24. How many Sodium (Na) are in 6NaCl?
  1.    1
  2.    12
  3.    6
  4.    none of the above
 Discuss Question
Answer: Option C. -> 6

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