Plsss!! Which of the following equations is balanced?

Question 3 options:

1) 2H2 + O2 → 4H2O

2) 4Na + O2 → 2Na2O

3) Fe2O3 + H2 → 2Fe + 3H2O

4) CH4 + O2 → CO2 + H2O

Is a pencil falling to the floor anon contact force, a force, or a contact force

Which of the following is the correct definition of chemical energy? a. energy an object has because of its motion or position b. energy resulting from the flow of charged particles, such as electrons or ions c. energy produced from the splitting of atoms d. energy stored in chemical bonds of molecules

Listenbase your answer to the question on the information below.nuclear radiation is harmful to living cells, particularly to fast-growing cells, such as cancer cells and blood cells. an external beam of the radiation emitted from a radioisotope can be directed on a small area of a person to destroy cancer cells within the body.cobalt-60 is an artificially produced radioisotope that emits gamma rays and beta particles. one hospital keeps a 100.0-gram sample of cobalt-60 in an appropriate, secure storage container for future cancer treatment.which choice represents the correct product for the beta decay of the co-60? fe-60ni-60fe-61ni-61