The chocolate in your favorite candy bar has the chemical formula: C7H8N4O2. What elements are present in this formula? Carbon, hydrogen, nitrogen, oxygen. How many atoms of each element are in this molecule? 7 carbon atoms, 8 hydrogen atoms, 4 nitrogen atoms, and 2 oxygen atoms.

Using some of the trends that you described in question 2, what patterns do you notice between these elements on the periodic table? (Hint!: Be sure to refer to your periodic table to answer this question!)

Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.