Balloons filled with oxygen will sink and balloons filled with nitrogen will also sink, this is because oxygen is more dense than air but nitrogen is only slightly less dense than air meaning it is not enough for the nitrogen to rise
Carbon has the ability to form multiple bonds because it has four valence electrons. Having four valence electrons means that carbon has a lot of space to form bonds with other atoms, or multiple bonds, in order to reach the full octet.
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B will make little difference to reaction rate while C and D will reduce the reaction rate. So the answer is A. adding heat energy to the reactants
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The array will be created with the elements equal to null.
I think the answer is magnetic field?
