<span>A. It increases the number of collisions between molecules.
I hope this helps :)</span>
Answer:
neon is the Noble gas but I have not studied this much
<span>The independent variable is the one that does not change depending on other variables - so here it would be the presence or the absence of caffeine - this is dependent on Tina's actions, but not on other variables in the experiment. The dependent variable is the heart rate - it is assumed to depend on the presence or absence of caffeine. A hypothesis could be that "Caffeine causes an increase of heart rate in earthworms" - and this hypothesis is what the experiment is testing.</span>
When an atom or molecule loses an electron it is oxidized and the reaction is called oxidation, when an atom or molecule gains an electron it is reduced and this is known as reduction. Both oxidation and reduction are known as Redox reaction
