Which statement is true about balancing equations?
a. coefficients can be changed, but not made negative.
b. subscripts cannot be changed.
c. the total number of atoms of each element must be the same on both sides of the equation.
d. all of the above.
e. none of the above.

After watching the video "zinc strip in copper nitrate solution", and reading the instructions, click on the link labeled "start" just below the drawing of the pencil tip. follow the direction to complete the 3x3 grid. answer the below questions for the portion of the activity in which sn(s) is placed in agno3(aq)