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Author Question: An acetylene molecule contains 2 atoms of carbon. The number 2 represents how many significant ... (Read 94 times)

cookcarl

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on: Aug 27, 2018
An acetylene molecule contains 2 atoms of carbon. The number 2 represents how many significant figures?
 
  A) one
  B) two
  C) three
  D) infinite

Question 2

Which are isotopes? An atom that has an atomic number of 20 and a mass number of 42 is an isotope of an atom that has
 
  A) an atomic number of 21 and a mass number of 42.
  B) an atomic number of 20 and a mass number of 40.
  C) 22 neutrons and 20 protons.
  D) 22 protons and 20 neutrons.


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blakcmamba

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Reply #1 on: Aug 27, 2018
Answer to Question 1

D

Answer to Question 2

B


cookcarl

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Reply 2 on: Aug 27, 2018
Thanks for the timely response, appreciate it

Sarahjh

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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