Atoms with the same atomic number but different atomic mass are called
a. prototypes.
b. subtypes.
c. isotopes.
d. ions.

One student said that the investigation was not valid (a fair test). write a plan for the investigation that includes improvements to the method and apparatus

What is the morality of 2.50 l of solution that contains 1.85 mol of anhydrous sodium tetraborate?

Plz a person walks 1 mile every day for exercise, leaving her front porch at 9 am and returning to her front porch at 9: 25 am what was the total displacement of her daily walk a. 1 mile b. 0 c. 25 min d. none of the above