Why pure hydrogen is not used in ballons ?

List four observations that indicate that a chemical reaction may be taking place

No copying 15 pts how does a free-body diagram tell you about the net force on an object?

Predict the relative bond lengths of the three carbon-oxygen bonds in the carbonate ion (co2−3). what would you expect the charge to be on each oxygen? match the words in the left column to the appropriate blanks in the sentences on the right. make certain each sentence is complete before submitting your answer.