an equation is balanced by?

Question

a. changing subscripts.
b. erasing elements as necessary.
c. adding coefficients.
d. adding elements as necessary.

Answer 1

c is the only one that you can change

the "law of conservation of mass" states that mass is always conserved so you can't just add or erase elements. changing the subscripts would be changing the compound.

Answer 2

most definitely C. adding coefficients. this is most likely chemistry. when you change subscripts you change the element all together. erasing elements as necessary would not balance the equation only change it to another, it might be balanced but not the one you want. that's the same for adding elements. adding coefficients allows you to change the quantity of that element allowing change in amount but not the element itself.

Answer 3

Adding coefficients. You can't change the subscript. It's impossible. It's permanent. The only thing you can change in the coefficient so you have to keep increasing the coefficients of the compounds untile both sides of the equation are balanced.

Answer 4

a. NO, subscripts are decided by valency
b. NO, elements cannot be erased, otherwise aim of the reaction is not valid
c. YES, adding coefficients means adding more quantities of same substance which is allowed
d. NO, elements cannot be added, otherwise aim of the reaction is not valid

Answer 5

c. Adding coefficients.

You've already got the correct reactants and products...you just need to have the same number of atoms of each element on both sides of the equation to make it a balanced equation.

Answer 6

ading coefficients

Answer 7

c. adding coefficients

Answer 8

I think b,c and d are all true to balance equations.

Answer 9

c- adding coefficents.

Answer 10

d