Describe scalar and vector quantities. Include a definition and provide at least one example of how they are alike and how are they different.

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87

Which component of the earth’s atmosphere is decreased due to photosynthesis?

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.