Which of the following is not a clue for a chemical change ? A)leaves of the tree changing color
B) rusting of iron
C) fermentation of milk
D) Melting of ice

Why do cells appear different in distilled water than they do in 10% salt water?

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.

Mercury metal is poured into a graduated cylinder that holds exactly 22.5 ml the mercury used to fill the cylinder mass in 306.0 g from this information calculate the density of mercury