- The elements in the chemical reaction stays the same after the reaction
- Oxygen reacts with iron to produce rust
- So, iron and oxygen elements stay the same after the reaction

- The elements in the chemical reaction stays the same after the reaction
- Oxygen reacts with hydrogen to produce water
- Therefore, oxygen and hyrdrogen elements stay the same after the reaction

- Iron and oxygen elements stay the same after the reaction
- Oxygen and hyrdrogen elements stay the same after the reaction
- Hence, the elements of two reactions stay the same

So, the elements of two reactions stay the same
[Question]Oxygen reacts with iron to produce rust and with hydrogen to produce water. Which statement describes both reactions?
[Context]- The elements in the chemical reaction stays the same after the reaction 
- Oxygen reacts with hydrogen to produce water 
- Oxygen reacts with iron to produce rust