Nina and her mother both have cell phones. Nina thinks her cell phone is lighter than her mother's. If Nina wants to compare masses of the cell phones what is the best tool for her to use?

A) thermometer
B) beaker
C) balance
D) graduated cylinder

In a copper wire, a temperature increase is the result of which of the following

13. a covalent bond between two atoms is likely to be polar if: a. one of the atoms is much more electronegative than the other. b. the two atoms are equally electronegative. c. the two atoms are of the same element. d. the bond is part of a tetrahedrally shaped molecule. e. one atom is an anion.

Consider the story you just read. all but one of the choices below indicate that something is living.