It is believed that the planet Mars has a much thicker carbon ...

[jenna1]

It is believed that the planet Mars has a much thicker carbon dioxide atmosphere in the past than it does today. Where the bulk of this carbon dioxide go?
 
  A) it reacted with surface rocks
  B) it condensed to form the polar caps
  C) it was destroyed in the atmosphere through chemical reactions
  D) it was lost into space

Question 2

Each of the following describes an Atom 1 and an Atom 2. In which case are the two atoms isotopes of each other?
 
  A) Atom 1: nucleus with 6 protons and 8 neutrons, surrounded by 6 electrons
  Atom 2: nucleus with 7 protons and 8 neutrons, surrounded by 7 electrons
  B) Atom 1: nucleus with 8 protons and 8 neutrons, surrounded by 8 electrons
  Atom 2: nucleus with 8 protons and 8 neutrons, surrounded by 7 electrons
  C) Atom 1: nucleus with 92 protons and 143 neutrons, surrounded by 92 electrons
  Atom 2: nucleus with 92 protons and 146 neutrons, surrounded by 92 electrons
  D) Atom 1: nucleus with 1 proton and 0 neutrons, surrounded by 1 electron
  Atom 2: nucleus with 2 protons and 2 neutrons, surrounded by 2 electrons
  E) Atom 1: nucleus with 4 protons and 5 neutrons, surrounded by 4 electrons
  Atom 2: nucleus with 5 protons and 5 neutrons, surrounded by 4 electrons

[babybsemail]

Answer to Question 1

D

Answer to Question 2

C

[jenna1]

Excellent

[dantucker]

TYSM