Grade 8 · Science
Count atoms in chemical equations practice
Use coefficients and subscripts to check conservation of each element in a simple equation.
Opening your practice adventure…
Try a sample
In CO2, how many oxygen atoms does the subscript show per molecule?
- 1
- 0
- 2
- 3
See the answer & why
2
The subscript 2 belongs to oxygen in CO2.
A little hint: A coefficient multiplies every atom in the formula; compare each element on both sides.
A teaching tip
A coefficient multiplies every atom in the formula; compare each element on both sides.