What is the coefficient for sodium in the balanced equation? __Na + O2 --> __Na2O

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled

Achemist who studies water samples did a demonstration of how to test for lead in water. she added a clear solution of potassium iodide to a clear solution of lead nitrate. then a yellow swirling solid formed in the liquid. what is most likely true about the yellow solid?

When scientists are ready to publish the results of their experimentation, why is it important for them to include a description of the procedures they used?